Calculators
Free online calculators — fast, private, and easy to use. No sign-up required.
Showing 20 of 20
Percentage Calculator
Calculate percentages instantly. Find what X% of a number is, what percentage X is of Y, or calculate percentage change.
BMI Calculator
Calculate your Body Mass Index (BMI) instantly. Supports metric (kg/cm) and imperial (lbs/ft+in) units. Free online BMI calculator.
Age Calculator
Calculate your exact age in years, months, and days. Find your next birthday countdown and day of birth. Free online age calculator.
Scientific Calculator
Free online scientific calculator with trigonometric functions, logarithms, powers, and constants. Supports keyboard input and calculation history.
Standard Deviation Calculator
Calculate standard deviation, variance, mean, and sum for a data set. Supports both population and sample formulas. Free and private.
Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals to numbers instantly. Supports 1 to 3,999,999. Free, private converter.
Number to Words Converter
Convert numbers to words for cheques, contracts, and learning. Spell out amounts and currency in plain English. Free and private.
Ratio Calculator
Simplify ratios, scale them up, and solve for a missing value. Great for recipes, mixing, and aspect ratios. Free and private.
Mean Median Mode Calculator
Calculate mean, median, mode, and range for a data set, plus sum and count. Fast descriptive statistics. Free and private.
Proportion Calculator
Solve proportions for an unknown value. Enter three terms of A/B = C/D and get the fourth, with cross-multiplication shown. Free and private.
Love Calculator
A fun love compatibility calculator. Enter two names for a playful match percentage. Just for entertainment. Free and private.
Flight Distance Calculator
Calculate great-circle flight distance between two airports by IATA or ICAO code, with kilometers, miles, nautical miles, and estimated flight time.
Prime Number Checker
Check whether any whole number is prime, see its prime factorization if it is not, and list every prime up to it. Free and instant in your browser.
GCF and LCM Calculator
Find the greatest common factor (GCF) and least common multiple (LCM) of two or more numbers, with each number’s prime factorization. Free and private.
Quadratic Equation Solver
Solve any quadratic equation ax² + bx + c = 0 for real or complex roots, with the discriminant and root type shown. Free and instant in your browser.
Scientific Notation Converter
Convert numbers between standard decimal form and scientific notation in both directions, with full expanded digits for very large or tiny values. Free and private.
Percentage Change Calculator
Work out the percentage increase or decrease between two numbers, plus the absolute change. Free, private, and instant in your browser.
Aspect Ratio Calculator
Simplify a width and height to its aspect ratio (like 16:9) and scale it to a new size while keeping proportions. Free, private, and instant in your browser.
Midpoint Calculator
Find the midpoint between two points on a coordinate plane, plus the distance between them. Free, private, and instant in your browser.
Fraction to Decimal Converter
Convert a fraction to a decimal and percentage, or turn a decimal back into its simplest fraction. Free, private, and instant in your browser.
Popular Calculators tools
- Percentage CalculatorThree percentage calculators in one: find a percentage, find what percentage a number is, and calculate percentage increase or decrease.
- BMI CalculatorEnter your weight and height to instantly see your BMI, weight category, and a visual scale. Switch between metric and imperial units.
- Age CalculatorEnter your date of birth to find your exact age in years, months, days, and hours. See your next birthday countdown.
- Scientific CalculatorA full-featured scientific calculator in your browser. Trig functions, logarithms, powers, factorial, memory, and keyboard support.
- Standard Deviation CalculatorPaste your numbers to get the standard deviation, variance, mean, count, and sum — with a choice of population or sample — in your browser.
- Mean Median Mode CalculatorPaste your numbers to get the mean, median, mode, range, sum, and count at once — a complete descriptive-stats snapshot in your browser.
Often used together
- Unit ConverterConvert between hundreds of units instantly. Switch categories with one click — length, weight, temperature, volume, speed, area, and data.
- Loan CalculatorEnter your loan amount, rate, and term to see your exact monthly payment and total cost. Compare multiple interest rates side by side.
- Calorie CalculatorCalculate your BMR and TDEE using the Mifflin-St Jeor formula for accurate daily calorie targets.
- Compound Interest CalculatorSee exactly how compound interest grows your savings over time. Add monthly contributions and compare compounding frequencies.
About Calculators
Everyday math has a habit of showing up when you least expect it: splitting a bill, working out a discount, checking a test average, or figuring out exactly how old someone will be on a future date. ToolsHub bundles the calculators people search for most into one tidy collection, each one designed to give a clear answer the moment you enter your numbers.
The Percentage Calculator covers discounts, tips, taxes, and grade math, while the Scientific Calculator handles trigonometry, logarithms, and powers for tougher problems. For data, the Standard Deviation Calculator and the Mean Median Mode Calculator turn a list of values into the figures you need, and the Ratio Calculator and Proportion Calculator solve scaling questions for recipes, models, and mixes.
There are handy converters and lighter tools too. The Age Calculator finds the exact span between two dates in years, months, and days, the Roman Numeral Converter translates between numbers and numerals, and the Number to Words Converter spells out figures for checks and contracts. The BMI Calculator offers an informational estimate from your height and weight, and the Love Calculator adds a bit of fun for good measure.
Every calculator runs entirely in your browser, so the numbers you type stay on your device and are never uploaded. The tools are free and need no account, which keeps them quick to reach for whenever a question comes up. Note that the BMI Calculator is informational only and is not medical advice—open a tool, enter your values, and read the result instantly.