Everyday calculators, done right.
200+ free tools for money, medicine, pharmacy, engineering, code, time, HR, travel, cars, events, design, family, insurance, and text — fast, accurate, and nothing leaves your browser unless a tool says so.
Your favorites
Currency converter
Live exchange rates across 131 world currencies, updated daily.
IP subnet calculator
CIDR breakdown, subnet mask, host range and usable host count.
Time zone converter
See the same moment across time zones.
Password generator
Generated locally in your browser using a cryptographically secure random source — never sent anywhere.
BMI calculator
Body mass index from height and weight. A screening measure, not a diagnosis.
Loan / EMI calculator
Monthly payment, total interest and total repayment for a fixed-rate loan.
Age calculator
Exact age in years, months and days, plus days until your next birthday.
Word & character counter
Words, characters, sentences and estimated reading time.
Hash generator
MD5, SHA-1, SHA-256 and SHA-512 — computed locally, nothing is uploaded.
| MD5 | — |
|---|---|
| SHA-1 | — |
| SHA-256 | — |
| SHA-512 | — |
GST calculator
Add or remove GST from a price across slabs.
SIP / investment calculator
Monthly investments to future maturity value.
Income tax calculator
Estimate income tax under India's old vs. new regime.
Simple interest calculator
Interest and total payable on a principal.
Compound interest calculator
Growth of a principal compounded over time.
Tip & bill splitter
Split a bill and tip across any number of people.
Take-home salary calculator
Estimate net pay from gross salary and deductions.
FD maturity calculator
Fixed deposit maturity value and interest earned.
Break-even calculator
Units needed to sell to cover fixed and variable costs.
Stacked discount calculator
Apply multiple successive discounts to one price.
Business days calculator
Working days between two dates, skipping weekends.
Stopwatch & Pomodoro timer
A simple stopwatch and a 25-minute focus timer.
Work hours & timesheet calculator
Clock-in and clock-out times to total hours worked.
Retirement countdown
Years and months remaining to your target retirement date.
JWT decoder
Inspect a JSON Web Token's header and payload.
Decoded locally — this does not verify the signature.
Cron expression parser
Explain a cron expression in plain English.
Five space-separated fields: minute (0-59), hour (0-23), day of month (1-31), month (1-12), day of week (0-6, Sun-Sat).
Ping tool
Measure round-trip response time to websites or devices on your local network, right from your browser.
| Target | Min | Avg | Max | Loss |
|---|
Internet speed test
Estimate your download speed, upload speed, and latency — right from your browser.
DNS lookup tool
Look up A, AAAA, MX, TXT, CNAME, and NS records for any domain.
IP geolocation lookup
Look up the approximate location and network for any IP address — or your own.
WHOIS / domain lookup
Look up registration details for any domain — registrar, dates, and name servers.
Moon phase calculator
See the moon's phase and illumination for any date, past or future.
Sunrise & sunset calculator
Sunrise, sunset, solar noon, and day length for any place and date.
Planet weight & age calculator
What you'd weigh, and how old you'd be, on every planet in the solar system.
| World | Your weight | Your age |
|---|
Astronomical distance & light-time converter
Convert between km, miles, AU, light-years, and parsecs — and see how long light takes to travel.
Password breach checker
Check if a password has appeared in known data breaches — without ever sending the password itself.
2FA / TOTP code generator
Enter an authenticator secret and see the live 6-digit code it generates.
File hash & integrity checker
Get a file's MD5, SHA-1, SHA-256, and SHA-512 hash to verify a download is intact.
| Algorithm | Hash |
|---|---|
| MD5 | |
| SHA-1 | |
| SHA-256 | |
| SHA-512 |
Security headers checker
Checks a website's HTTP security headers — CSP, HSTS, X-Frame-Options, and more.
Secure random key / token generator
Generate cryptographically random API keys, secrets, and tokens in hex, Base64, or UUID.
Text encryption / decryption (AES)
Encrypt or decrypt a block of text with a passphrase, using AES-GCM in your browser.
Password strength & crack-time estimator
See how strong a password is and roughly how long it would take to crack.
MAC address generator & lookup
Generate a random MAC address or look up its vendor prefix.
This is a small sample list, not the full IEEE OUI registry.
Calorie & BMR calculator
Daily calorie needs from your BMR and activity level.
Aspect ratio calculator
Resize dimensions while keeping the same proportions.
Water intake calculator
Daily recommended water intake by weight and activity.
Body Surface Area (BSA) Calculator
Estimate body surface area using the Mosteller formula for dosing reference.
For reference only — not a substitute for professional clinical judgment.
Pediatric Dosage Calculator
Calculate per-dose and daily medication amounts from weight-based dosing.
Check the drug's prescribing reference — this varies by medication.
For reference only — always verify pediatric dosing against a current drug reference and clinician orders before administration.
IV Drip Rate Calculator
Calculate IV flow rate and drip rate from volume, time, and drop factor.
For reference only — not a substitute for professional clinical judgment.
Creatinine Clearance (eGFR) Calculator
Estimate creatinine clearance using the Cockcroft-Gault formula.
For reference only — not a substitute for professional clinical judgment.
APGAR Score Calculator
Score a newborn's condition across five categories immediately after birth.
For reference only — not a substitute for professional clinical judgment.
Glasgow Coma Scale (GCS) Calculator
Score consciousness level from eye, verbal, and motor responses.
For reference only — not a substitute for professional clinical judgment.
Pregnancy Due Date Calculator
Estimate the due date and current gestational age from the last period.
Estimated using Naegele's rule — for reference only, not a substitute for professional clinical judgment.
Ovulation Calculator
Estimate your ovulation day, fertile window, and next period date.
For reference only — not a substitute for professional clinical judgment.
Anion Gap Calculator
Calculate the serum anion gap from sodium, chloride, and bicarbonate.
For reference only — not a substitute for professional clinical judgment.
Corrected Sodium & Calcium Calculator
Adjust sodium for hyperglycemia or calcium for low albumin.
For reference only — not a substitute for professional clinical judgment.
Blood Glucose Unit Converter
Convert blood glucose readings between mg/dL and mmol/L instantly.
Conversion factor: mmol/L = mg/dL ÷ 18.0182
Cholesterol & Triglycerides Unit Converter
Convert cholesterol or triglyceride readings between mg/dL and mmol/L.
Conversion factor: mmol/L = mg/dL × 0.02586 (cholesterol)
Waist-to-Hip Ratio Calculator
Calculate your WHR and see your WHO-based health risk category.
For reference only — not a substitute for professional clinical judgment.
Target Heart Rate Zone Calculator
Find your training heart rate zones based on your age.
For reference only — not a substitute for professional clinical judgment.
Dilution Calculator (C₁V₁=C₂V₂)
Solve for stock or final concentration/volume using the dilution equation.
Units are unlabeled — just keep concentration and volume units consistent across all fields.
Alligation Calculator
Find how much high- and low-strength stock to combine for a target strength.
Milliequivalent (mEq) Calculator
Convert a dose between milligrams and milliequivalents.
For reference only — always verify with a pharmacist or prescriber before administering.
Prescription Days-Supply Calculator
Calculate the days supply for a dispensed quantity and dosing schedule.
Medication Unit Converter
Convert a dose between micrograms, milligrams, grams, and grains.
Based on 1 g = 1000 mg = 1,000,000 mcg and 1 grain = 64.79891 mg.
Insulin Dose Calculator
Estimate correction, meal, and total insulin doses.
For reference only — always verify insulin doses with a pharmacist, prescriber, or your care plan before administering.
Beyond-Use Date (BUD) Calculator
Calculate a compounded preparation's beyond-use date.
BUD periods vary by USP <795>/<797> category, storage conditions, and formulation — always confirm the applicable standard before assigning a beyond-use date.
Ohm's Law Calculator
Solve for voltage, current, or resistance instantly.
Resistor Color Code Calculator
Decode a 4-band resistor's value and tolerance from its colors.
Voltage Divider Calculator
Find output voltage and current across a two-resistor divider.
AWG Wire Gauge Calculator
Convert an AWG size to wire diameter, area, and resistance.
Ampacity depends on insulation type, bundling, and installation conditions — check your local electrical code before sizing a circuit.
Capacitor Energy & Charge Calculator
Compute stored charge and energy for a capacitor at a given voltage.
Concrete Volume Calculator
Estimate concrete volume and cement bags needed for a slab pour.
Estimate only — verify against your design code / mix specification before use.
Beam Deflection Calculator
Estimate mid-span deflection of a simply-supported beam under a point load.
Estimate only — verify against your design code / mix specification before use.
Gear ratio calculator
Find gear ratio and output RPM from driver and driven teeth counts.
Power factor calculator
Find power factor, reactive power, and phase angle from real and apparent power.
Reynolds number calculator
Calculate Reynolds number and identify laminar, transitional, or turbulent flow.
Default 1000 kg/m³ for water
Default 0.001 Pa·s for water
Torque unit converter
Convert torque values live between newton-meters, pound-feet, pound-inches, and kgf-cm.
Type a value in any field — the other three update automatically.
Projectile motion & free-fall calculator
Calculate free-fall time and impact velocity, or projectile range and flight time.
Molarity calculator
Find moles of solute and solution molarity from mass, molar mass, and volume.
pH calculator
Convert between pH, pOH, and hydrogen ion concentration.
Example: 1e-7 for pure water
Number Base Converter
Convert numbers instantly between decimal, binary, octal, and hexadecimal.
CSS Unit Converter
Convert between px, rem, em, and pt using your chosen base font size.
This tool treats 1em the same as 1rem (relative to the base font size), since em can vary by nesting context in real layouts.
HTTP Status Code Reference
Search and browse common HTTP response status codes and their meanings.
ASCII / Unicode Character Lookup
Look up decimal, hex, and binary codes for any character, or the reverse.
Reference: printable ASCII characters 32-126.
Cron Next Run Time Previewer
Preview the next few times a 5-field cron expression will fire.
Supports *, single numbers, comma lists (1,2,3), and ranges (a-b) for each field. Step values like */15 are not evaluated and are treated as "any" (*).
File Size Converter
Convert between bits, bytes, KB, MB, GB, and TB in binary or decimal.
Download Time Estimator
Estimate how long a download will take at a given connection speed.
Mortgage / Home Loan Calculator
Estimate your monthly EMI, total interest, and total payment on a home loan.
Rental Yield Calculator
Calculate gross and net rental yield percentage for an investment property.
Stamp Duty & Registration Calculator
Estimate stamp duty, registration charges, and total costs on a property.
Required Exam Score Calculator
Find the score you need on your final exam to hit your target grade.
Weighted Grade Calculator
Combine multiple assignment scores and weights into a final weighted grade.
One-Rep Max (1RM) Calculator
Estimate your one-rep max strength using the Epley and Brzycki formulas.
Calories Burned Calculator
Estimate calories burned during an activity based on MET value, weight and time.
Photography Exposure Value (EV) Calculator
Compute exposure value from aperture, shutter speed and ISO settings.
Depth of Field Calculator
Find hyperfocal distance, near/far limits and total depth of field for a shot.
Fuel Economy Calculator
Convert trip distance and fuel used into km/L, L/100km, MPG and trip cost.
Gold Price Today
India-market gold price (incl. import duty & GST) for 24K/22K/18K/14K — per gram, per pavan, per 10 grams — plus city-wise rates.
| Purity | Per gram | Per pavan (8g) | Per 10 grams |
|---|
City-wise gold rate today
22K & 24K per-gram rates for 15 major Indian cities, modeled on typical regional spreads.
There's no free live feed that reports a genuinely different bullion rate per city — the metal price itself is set nationally. City figures here start from the same live India-market rate above and apply typical regional premiums (metro demand hubs like Mumbai/Bengaluru run lowest; logistics and local demand push others slightly higher). Your local jeweller's making charges, wastage and margin sit on top of all of these, and vary store to store — treat this as a reference, not a final billed price.| City | 22K · per gram | 24K · per gram |
|---|
Data accuracy & methodology
Exactly what's live, what's a fixed rate, and what's a modeled estimate on this page.
| Component | Value used | Status | Source |
|---|---|---|---|
| International gold spot price | — | — | gold-api.com (XAU/USD) |
| USD → INR exchange rate | — | — | frankfurter.dev |
| India basic customs duty on gold | 15% | Fixed, not live | Government of India customs notification, hiked from 6% on 13 May 2026 |
| GST on gold (on duty-loaded value) | 3% | Fixed, not live | Indian GST law |
| Karat purity ratios (24K/22K/18K/14K) | 0.999 / 0.916 / 0.750 / 0.585 | Fixed (definitional) | Standard karat-to-purity conversion |
| City-wise regional spread | ×1.000 to ×1.005 | Modeled estimate, not live | Typical regional pattern published by Indian gold-rate portals — no free live per-city feed exists |
Silver Price Today
India-market silver price (incl. import duty & GST) for fine/sterling/coin silver — per gram, per 100 grams, per kg — plus city-wise rates.
| Purity | Per gram | Per 100 grams | Per kg |
|---|
City-wise silver rate today
Fine (999) & sterling (925) per-gram rates for 15 major Indian cities, modeled on typical regional spreads.
There's no free live feed that reports a genuinely different bullion rate per city — the metal price itself is set nationally. City figures here start from the same live India-market rate above and apply typical regional premiums (metro demand hubs like Mumbai/Bengaluru run lowest; logistics and local demand push others slightly higher). Your local dealer's making charges and margin sit on top of all of these, and vary store to store — treat this as a reference, not a final billed price.| City | 925 · per gram | 999 · per gram |
|---|
Data accuracy & methodology
Exactly what's live, what's a fixed rate, and what's a modeled estimate on this page.
| Component | Value used | Status | Source |
|---|---|---|---|
| International silver spot price | — | — | gold-api.com (XAG/USD) |
| USD → INR exchange rate | — | — | frankfurter.dev |
| India basic customs duty on silver | 15% | Fixed, not live | Government of India customs notification, standardized with gold at 15% effective duty from 13 May 2026 |
| GST on silver (on duty-loaded value) | 3% | Fixed, not live | Indian GST law |
| Purity ratios (fine 999 / sterling 925 / coin 900) | 0.999 / 0.925 / 0.900 | Fixed (definitional) | Standard silver purity conversion |
| City-wise regional spread | ×1.000 to ×1.005 | Modeled estimate, not live | Typical regional pattern published by Indian bullion-rate portals — no free live per-city feed exists |
Citation Generator
Format a citation in APA, MLA and Chicago style from a few source details.
| APA | — |
|---|---|
| MLA | — |
| Chicago | — |
CGPA to Percentage Converter
Convert between CGPA and percentage using a custom or standard multiplier.
Typing Speed Test
Type the passage below as fast and accurately as you can.
Flashcard Maker
Paste term/definition pairs, one per line, and study them as flashcards.
Spaced Repetition Scheduler
Plan review dates for a topic using a spaced repetition interval schedule.
| Topic | Next review | Progress |
|---|
No topics scheduled yet — add one above.
Readability Score Checker
Flesch Reading Ease and Flesch-Kincaid grade level for any text.
Essay Similarity Checker
Compare two texts and see a word-level similarity score.
Recipe Unit Converter
Convert cups, tablespoons, grams and more, with ingredient-specific weights.
Recipe Scaler
Scale a recipe's ingredients up or down to any number of servings.
Oven Temperature Converter
Convert oven temperatures between Fahrenheit, Celsius and gas mark.
| Named setting | °F | °C | Gas mark |
|---|---|---|---|
| Very cool / slow | 250–275°F | 120–140°C | ½–1 |
| Cool | 300°F | 150°C | 2 |
| Moderate | 350°F | 180°C | 4 |
| Moderately hot | 375–400°F | 190–200°C | 5–6 |
| Hot | 425°F | 220°C | 7 |
| Very hot | 450–475°F | 230–245°C | 8–9 |
Multi-Stage Cooking Timer
Run several named kitchen timers at once, like boil, simmer and rest.
No timers running yet — add one above.
Baker's Percentage Calculator
Work out each ingredient as a percentage of total flour weight for dough.
| Ingredient | Weight (g) | Baker's % |
|---|
Ingredient Substitution Finder
Look up practical substitutes and ratios for common cooking ingredients.
Roast & Meat Cooking Time Calculator
Estimate roasting time and target temperature by meat type, weight and doneness.
Water-to-Grain Ratio Calculator
Correct water or liquid ratios for rice, quinoa, oats and other grains.
Leftover Food Safety Timer
Track how long cooked food has been refrigerated and when to use or toss it.
| Food | Stored | Status |
|---|
Nothing tracked yet — add a leftover above.
General fridge-storage guidance (0–4°C) — always use your judgement and discard anything that smells or looks off.Recipe Cost Calculator
Add up ingredient costs to get a total and per-serving price for a dish.
Vehicle Mileage Calculator
Log each fuel fill-up with odometer readings to track real mileage over time.
| Date | Odometer | Fuel added | Distance | Mileage |
|---|
No fill-ups logged yet — add your first one above. Mileage is calculated once you have at least two entries.
Mileage for each row is the distance since the previous fill-up divided by the fuel added at this fill-up (the fuel that refilled what was used over that distance) — the same method most odometer-based mileage logs use.Macronutrient (Macro) Calculator
Split your daily calories into protein, carb and fat grams for your goal.
Body Fat Percentage Calculator
Estimate body fat percentage using the U.S. Navy tape-measurement method.
Ideal Body Weight Calculator
Estimate a healthy target weight range from height, using common medical formulas.
| Formula | Estimated weight |
|---|
Calorie Deficit / Surplus Planner
Plan a daily calorie target to lose, gain or maintain weight by a target date.
Intermittent Fasting Timer
Track your fasting and eating windows with a live countdown.
Protein Intake Calculator
Estimate your daily protein target in grams based on body weight and goal.
Notice period calculator
Your last working day, from your resignation date and notice period — India.
Last working day calculator
Working backward: the latest date you must resign by, for a target last working day.
Salary breakup calculator
Split an annual CTC into Basic, HRA, PF, gratuity provision and special allowance — India.
CTC to take-home salary calculator
Estimate your monthly in-hand pay from annual CTC, after PF, professional tax and income tax — India.
Gratuity calculator
Gratuity payable on leaving a job, under India's Payment of Gratuity Act.
Leave encashment calculator
Cash value of your unused earned leave days.
Overtime pay calculator
Extra pay for overtime hours, from a monthly salary.
Work experience calculator
Total experience in years, months and days, between two dates.
Probation end date calculator
Probation end date, from your joining date and probation period.
Flight Time & Layover Calculator
Real flight duration and total trip time across time zones, including a connecting flight.
Flight 1
Flight 2 (connecting)
Shipping Cost & Dimensional Weight Calculator
Dimensional weight, billable weight and estimated cost for a parcel.
Travel Budget Calculator
Estimate total trip cost from a per-day spend across accommodation, food, transport and activities.
Visa-Free Days Tracker (90/180 Rule)
Days used and days remaining under a rolling 90-in-180-day visa rule, like the Schengen area.
Trips (past and planned)
Maternity / Hospital Bag Checklist
A packing checklist for mom, baby and your support person, for labor and the hospital stay.
Tire Size / Speedometer Error Calculator
Speedometer error and true speed after changing tire size.
Original tire size
New tire size
Fuel Cost for a Trip Calculator
Estimated fuel needed and total cost for a trip, from distance, fuel economy and fuel price.
Engine Displacement Calculator
Total engine displacement in cc, liters and cubic inches from bore, stroke and cylinder count.
Brake Fluid / Oil Change Interval Tracker
Next due date and distance for common vehicle fluid and service intervals.
Compression Ratio Calculator
Engine compression ratio from bore, stroke, chamber volume and piston volume.
Towing Capacity & Payload Calculator
Available payload and towing capacity from GVWR, GCWR and curb weight.
Guest List & Seating Chart Generator
Track guests and RSVP status, and auto-assign them to tables by seats per table.
Guests
Catering Quantity Calculator
Food, drink, ice and supplies quantities needed for a guest count and event length.
Event Budget Tracker
Track estimated vs. actual cost by category and see what's left of your budget.
Categories
| Category | Estimated | Actual | Difference |
|---|
RSVP Percentage & Headcount Projector
Projected final headcount from responses so far, plus-ones and a typical response rate.
Event Timeline / Run-of-Show Generator
Turn a start time and a list of segments into a minute-by-minute event schedule.
Segments
| Start | End | Segment | Duration |
|---|
Wedding Planning Checklist
A wedding planning checklist with target dates, counting back from your wedding date.
Color Palette Generator
Generate complementary, analogous, triadic and monochromatic palettes from a single base color.
Complementary
Analogous
Triadic
Monochromatic
Golden Ratio / Rule-of-Thirds Grid Generator
Grid line positions for a canvas using the rule of thirds and the golden ratio.
Print Bleed & Margin Calculator
Full bleed document size and safe area from a trim size, bleed and safety margin.
Room Layout / Furniture Scale Calculator
Scaled drawing size for a room and its furniture at any architectural scale.
Furniture item (optional)
Typography Scale Generator
A modular type scale of heading and body sizes from a base size and ratio.
| Step | Size (px) | Size (rem) | Preview |
|---|
Baby Feeding & Sleep Schedule Generator
A daily feeding and nap-time schedule from a wake-up time and intervals.
Feeding times
Nap times
Child Growth Percentile Calculator
Approximate weight and height percentile for a child's age and sex.
Screen Time Budget Calculator
Leftover free time in the day after sleep and commitments, against a screen time goal.
Allowance & Chore Tracker
Track chores done against their value and see total earnings for the week.
Chores
College Savings Goal Calculator
Projected college fund value from current savings and monthly contributions, and what's needed to hit a goal.
Life Insurance Coverage Needs Calculator
Estimated additional life insurance coverage needed using the DIME method.
Term vs. Whole Life Premium Comparison
Compare total premium cost, and what investing the difference could grow to.
Auto Insurance Deductible Break-Even Calculator
Years of premium savings needed to break even on a higher deductible.
Option A — lower deductible
Option B — higher deductible
Health Insurance Out-of-Pocket Max Tracker
What a new medical bill costs you after your deductible, coinsurance and out-of-pocket max.
Home Loan Prepayment / Extra EMI Calculator
Interest and tenure saved by paying extra toward your loan's principal each month.
Net Worth Calculator
Total assets minus liabilities, broken down by category, with your net worth summary.
Assets
Liabilities
Credit Card Payoff Calculator
Months to clear a credit card balance and total interest paid at a fixed monthly payment.
Cash Denomination Counter
Enter how many of each note and coin you have — get an instant, itemized total.
| Denomination | Type | Count | Subtotal |
|---|
Sleep Cycle Calculator
Best bedtimes or wake-up times based on 90-minute sleep cycles.
Suggested bedtimes
| Sleep cycles | Duration | Time |
|---|
Paint Coverage Calculator
Liters or gallons of paint needed for a wall area, number of coats and coverage rate.
Food Calorie Checker & Daily Tracker
Look up calories for common foods and log servings to track your daily total against a goal.
Add a food
Today's log
| Food | Servings | Calories |
|---|
Solar Panel System Size Estimator
Panels and system size (kW) needed from daily energy usage and average sun hours.