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Free Online Calculators – Math, Finance, Health & Dates

Quick, accurate calculators for everyday math, money, health and dates. Work out a loan payment, compound growth or sales tax, check your BMI or daily calories, find your exact age or the days between two dates, and convert between units. Everything is calculated instantly in your browser.

40 tools

Scientific CalculatorNEW

Free online scientific calculator with trig (degrees and radians), logs, powers, roots, factorials, π and e. Type or tap, with history and keyboard support.

Percentage CalculatorNEW

Calculate percentages instantly: X% of Y, what percent X is of Y, percentage change between two values, and increasing or decreasing by a percentage.

Fraction CalculatorNEW

Add, subtract, multiply and divide fractions and mixed numbers. Results are simplified automatically and shown as a fraction, mixed number, decimal and percent.

Ratio CalculatorNEW

Simplify ratios like 1920:1080 to 16:9, and solve proportions (A:B = C:x) to find a missing value. Works with decimals and three-part ratios.

Average CalculatorNEW

Find the mean, median, mode, range, minimum, maximum and geometric mean of a list of numbers. Paste numbers separated by commas, spaces or lines.

Standard Deviation CalculatorNEW

Calculate sample or population standard deviation and variance for a data set, plus the mean, sum of squares and coefficient of variation.

Rounding CalculatorNEW

Round numbers to decimal places, the nearest 10, 100 or 0.05, or significant figures. Choose standard, banker's, up, down or truncate rounding.

Unit ConverterNEW

Convert length, weight, temperature, volume, area, speed, data storage, time, pressure and energy units instantly. See the value in every unit at once.

Length ConverterNEW

Convert length and distance units: millimeters, centimeters, meters, kilometers, inches, feet, yards, miles and nautical miles.

Weight ConverterNEW

Convert weight and mass units: milligrams, grams, kilograms, metric tons, ounces, pounds, stones and US tons.

Temperature ConverterNEW

Convert temperatures between Celsius, Fahrenheit and Kelvin instantly, with the formulas explained.

Volume ConverterNEW

Convert volume units: milliliters, liters, cubic meters, teaspoons, tablespoons, fluid ounces, cups, pints, quarts and US/UK gallons.

Area ConverterNEW

Convert area units: square centimeters, meters, kilometers, inches, feet, yards and miles, plus acres and hectares.

Speed ConverterNEW

Convert speeds between kilometers per hour, miles per hour, meters per second, feet per second and knots.

Data Storage ConverterNEW

Convert digital storage units: bits, bytes, KB, MB, GB, TB and their binary equivalents KiB, MiB, GiB and TiB.

Time ConverterNEW

Convert time units: milliseconds, seconds, minutes, hours, days, weeks and years.

Pressure ConverterNEW

Convert pressure units: pascals, kilopascals, bar, psi, atmospheres and millimeters of mercury.

Energy ConverterNEW

Convert energy units: joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours and BTU.

Discount CalculatorNEW

Calculate the sale price and how much you save with a percentage discount. Supports stacked discounts (extra % off) and sales tax.

Tip CalculatorNEW

Calculate the tip and split the bill between any number of people. Quick tip percentages and an option to round each share up.

Loan CalculatorNEW

Calculate your monthly loan payment (EMI), total interest and payoff date. Includes an amortization schedule and the savings from extra payments.

Mortgage CalculatorNEW

Estimate your monthly mortgage payment including principal, interest, property tax, insurance and HOA. See total interest and an amortization schedule.

Compound Interest CalculatorNEW

See how your money grows with compound interest and regular monthly contributions. Choose the compounding frequency and view year-by-year growth.

Simple Interest CalculatorNEW

Calculate simple interest and the total amount for any principal, rate and time in years, months or days. Shows the formula with your numbers.

SIP CalculatorNEW

Estimate the future value of a monthly SIP (systematic investment plan) with expected returns and an optional annual step-up. Year-by-year breakdown.

Savings Goal CalculatorNEW

Find out how much you need to save each month to reach a savings goal, taking your current savings and interest into account.

Sales Tax / VAT / GST CalculatorNEW

Add tax to a price or remove it from a tax-inclusive total. Works for sales tax, VAT and GST at any rate, with quick common rates.

Profit Margin CalculatorNEW

Calculate profit, gross margin and markup from cost and price, or find the selling price for a target margin or markup.

BMI CalculatorNEW

Calculate your body mass index (BMI) in metric or imperial units, see your WHO weight category and the healthy weight range for your height.

Calorie CalculatorNEW

Estimate how many calories you burn per day (TDEE) and need to lose, maintain or gain weight, using the Mifflin-St Jeor equation.

Body Fat CalculatorNEW

Estimate your body fat percentage from simple tape measurements using the U.S. Navy method. Includes fat mass, lean mass and fitness category.

Ideal Weight CalculatorNEW

Find your ideal body weight by height using the Robinson, Miller, Devine and Hamwi formulas, plus the healthy BMI weight range.

Water Intake CalculatorNEW

Estimate how much water to drink per day based on your weight, exercise and climate. Results in liters, glasses and fluid ounces.

Pregnancy Due Date CalculatorNEW

Estimate your due date from your last period, conception date or IVF transfer. See how far along you are, your trimester and key milestones.

Age CalculatorNEW

Calculate your exact age in years, months and days, plus total weeks and days, the weekday you were born and days until your next birthday.

Date Difference CalculatorNEW

Count the days between two dates and see the difference in weeks, months and years. Option to include the end date.

Add Days to DateNEW

Add or subtract days, weeks, months or years from any date and see the resulting date and weekday. Handles month ends and leap years.

Working Days CalculatorNEW

Count business days between two dates or add working days to a date. Choose your weekend (Sat–Sun, Fri–Sat) and exclude holidays.

Time Duration CalculatorNEW

Calculate hours and minutes between two times, including overnight shifts. Subtract breaks, get decimal hours and calculate pay.

Countdown TimerNEW

Live countdown in days, hours, minutes and seconds to any date and time: holidays, birthdays, events or deadlines.

Free online calculators for everyday life

From splitting a dinner bill to planning a mortgage, these calculators give you accurate answers with the formula shown, so you can trust and understand the result. Everything runs in your browser, so your numbers (salary, weight, dates) never leave your device. There's nothing to install and no sign-up.

Which calculator do I need?

I want to…Use
Do any math, including trig and logsScientific Calculator
Find X% of Y or a percentage changePercentage Calculator
Convert cm to inches, kg to lb, °C to °F…Unit Converter
See the real price of a sale itemDiscount Calculator
Split a bill and tipTip Calculator
Know my monthly loan or mortgage paymentLoan / Mortgage Calculator
See how investments growCompound Interest / SIP Calculator
Add or remove VAT, GST or sales taxSales Tax Calculator
Check my BMI or daily caloriesBMI / Calorie Calculator
Find my exact ageAge Calculator
Count days or business days between datesDate Difference / Working Days

Calculator groups

Math & everyday: scientific calculations, percentages, fractions, ratios, averages, standard deviation and rounding, plus discount and tip calculators for shopping and dining.

Unit converters: dedicated converters for length, weight, temperature, volume, area, speed, data storage, time, pressure and energy, covering more than 75 metric, imperial and US units.

Finance: loans, mortgages, compound and simple interest, SIPs, savings goals, sales tax and profit margins. Choose from many currencies; your choice is remembered.

Health & fitness: BMI, calorie needs (Mifflin-St Jeor), body fat (U.S. Navy method), ideal weight, water intake and pregnancy due dates.

Date & time: exact age, days between dates, adding days to a date, working days with holidays, hours worked and a live countdown.

Built to be accurate

  1. Standard, published formulas, such as the amortization formula, Mifflin-St Jeor and Naegele's rule, named on each page.
  2. Exact conversion factors: 1 inch = 2.54 cm and 1 lb = 0.45359237 kg by definition.
  3. No floating-point surprises: 0.1 + 0.2 shows 0.3, and 1.005 rounds to 1.01.
  4. Calendar-aware dates that handle leap years and month ends correctly.
  5. Clear error messages instead of silent wrong answers.

A note on financial and health results

Finance and health calculators give estimates for planning and education. They aren't financial, medical or dietary advice. Real loan offers include fees, investment returns vary, and health needs depend on factors no calculator can see. Talk to a qualified professional before making important decisions.

Frequently asked questions

Are these calculators accurate?

They use standard, published formulas (for example the amortization formula for loans, Mifflin-St Jeor for calories and the U.S. Navy method for body fat) and are tested against known reference values. Results are estimates for planning, not professional advice.

Is my data stored?

No. All calculations run in your browser and nothing you enter is sent to a server.

Do the calculators work on my phone?

Yes. Every calculator is designed for mobile, tablet and desktop.