Free online calculators that run in your browser
42 free calculators and converters for math, finance, dates, health and everyday costs. Each one shows its formula and a worked example, needs no sign-up, and nothing you enter is uploaded.
Math Calculators (11)Finance Calculators (10)Date and Time Calculators (6)Everyday Calculators (7)Unit Converters (8)
Math
Percentages, fractions, averages, roots, primes, a scientific calculator and other maths.
- Percentage CalculatorPercent of a number, percentage change, increase and decrease
- Square Root CalculatorSquare roots to up to 20 decimals, with the simplified radical form
- Power CalculatorRaise any number to any power, with exact results for whole exponents
- Rounding CalculatorRound to decimals, significant figures or a multiple, with eight methods
- Average CalculatorMean, median, mode, range and standard deviation of a list of numbers
- Ratio CalculatorSimplify a ratio, find a missing value in a proportion, or split a total
- Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers
- Greatest Common Divisor CalculatorGCD of two to twenty whole numbers, with the Euclidean algorithm steps
- Least Common Multiple CalculatorLCM of two to twenty whole numbers, with prime factorisations
- Prime Number CheckerTest whether a number is prime and see its factors, divisors and neighbouring primes
- Scientific CalculatorExact arithmetic, trigonometry, logarithms, roots, powers and factorials
- VAT CalculatorAdd VAT to a price or take it out of a price that already includes it
- Discount CalculatorSale price and savings from a percentage off, or the discount from two prices
- Salary CalculatorConvert pay between hourly, daily, weekly, monthly and yearly
- Profit Margin CalculatorProfit, margin and markup from cost and price, or the price for a target margin
- ROI CalculatorReturn on investment, gain or loss, and the annualised return over time
- Simple Interest CalculatorInterest, total amount, rate, time or principal with I = P × r × t
- Compound Interest CalculatorHow an amount grows with compound interest and regular contributions
- Savings CalculatorProject a savings balance, the monthly deposit for a goal, or the time to reach it
- Loan CalculatorMonthly payment, total interest and repayment schedule of a fixed-rate loan
- Mortgage CalculatorMonthly mortgage payment with property tax and insurance, and the cost over time
Dates and time
Ages, differences between dates, durations and countdowns.
- Age CalculatorExact age in years, months and days from a date of birth
- Days Between DatesCount the days between two dates, with weekdays and weekends
- Date Difference CalculatorThe time between two dates in years, months, weeks and days
- Date Addition CalculatorAdd or subtract years, months, weeks, days or business days from a date
- Time Duration CalculatorThe time between two clock times, with overnight spans and unpaid breaks
- Countdown CalculatorA live countdown in days, hours, minutes and seconds to any date
- Tip CalculatorWork out the tip and the total, and split it between people to the cent
- Split Bill CalculatorSplit a bill equally or by what each person ordered, to the cent
- Unit Price CalculatorCompare products by price per kg, litre or item to find the best value
- Fuel Cost CalculatorThe fuel needed and the cost of a trip, in km or miles, L/100 km or mpg
- Electricity Cost CalculatorWhat an appliance costs to run per day, month and year
- BMI CalculatorBody mass index, weight category and healthy weight range for adults
- Calorie CalculatorEstimate your daily calorie needs to maintain, lose or gain weight
Converters
Length, weight, temperature, area, volume, speed, time and data storage.
- Length ConverterConvert between metres, kilometres, miles, yards, feet, inches and more
- Weight ConverterConvert between kilograms, grams, pounds, ounces, stone and tons
- Temperature ConverterConvert between Celsius, Fahrenheit, Kelvin and Rankine
- Area ConverterConvert between square metres, hectares, acres, square feet and more
- Volume ConverterConvert between litres, gallons, quarts, cups, fluid ounces and cubic units
- Speed ConverterConvert between km/h, mph, m/s, knots and feet per second
- Time ConverterConvert between seconds, minutes, hours, days, weeks, months and years
- Data Storage ConverterConvert between bits, bytes, KB, MB, GB, TB and the binary KiB, MiB, GiB, TiB
Why use Calculatrixe
Calculated in your browser
Every calculation runs on your device. There is no upload, no account and no server that sees what you enter.
Exact where it matters
Numbers are handled as exact decimals, so you never see 7.000000000000001 for 7. When a result has to be rounded, the page says so and says how.
The formula is on the page
Each calculator shows its formula, a worked example, its assumptions and its limits, so you can check the result instead of taking it on trust.