14 free calculators — Percentages, fractions, averages, ratios and everyday math — solved instantly with the formula explained.
Calculate what X% of Y equals, and see the value after adding or removing that percentage.
Use calculatorFind the percentage increase between an old value and a new, larger value.
Use calculatorFind the percentage decrease between an old value and a new, smaller value.
Use calculatorAdd, subtract, multiply and divide fractions with automatic simplification.
Use calculatorCalculate the mean and median of any set of numbers, separated by spaces or commas.
Use calculatorSimplify a ratio and solve proportions like a:b = c:x for the missing value.
Use calculatorFind the square root of any non-negative number, plus its square and cube root.
Use calculatorRaise any base to any power, including negative and fractional exponents.
Use calculatorCompute sample and population standard deviation, variance and mean for a data set.
Use calculatorConvert favorable outcomes and total outcomes into a probability, percentage and odds.
Use calculatorFind the least common multiple of two whole numbers, with the GCD shown too.
Use calculatorFind the greatest common factor of two whole numbers using the Euclidean algorithm.
Use calculatorA full scientific calculator with trigonometry, logarithms, powers and parentheses.
Use calculatorGenerate truly even random numbers within any range, with optional uniqueness.
Use calculatorMath calculators: Percentages, fractions, averages, ratios and everyday math — solved instantly with the formula explained. Browse 14 free tools for math tasks. Enter values for instant results with formulas shown. No signup needed.
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| Calculator | What It Does | Formula |
|---|---|---|
| Percentage Calculator | Calculate what X% of Y equals, and see the value after adding or removing that percentage. | part = (percentage ÷ 100) × whole |
| Percentage Increase Calculator | Find the percentage increase between an old value and a new, larger value. | increase % = ((new − original) ÷ |original|) × 100 |
| Percentage Decrease Calculator | Find the percentage decrease between an old value and a new, smaller value. | decrease % = ((original − new) ÷ |original|) × 100 |
| Fraction Calculator | Add, subtract, multiply and divide fractions with automatic simplification. | a/b + c/d = (ad + cb)/(bd); multiplication multiplies straight across; division flips the second fraction |
| Average Calculator | Calculate the mean and median of any set of numbers, separated by spaces or commas. | mean = (sum of all values) ÷ (number of values) |
| Ratio Calculator | Simplify a ratio and solve proportions like a:b = c:x for the missing value. | a : b = c : x ⟹ x = (c × b) ÷ a |
| Square Root Calculator | Find the square root of any non-negative number, plus its square and cube root. | √x is the non-negative number y satisfying y × y = x |
| Exponent Calculator | Raise any base to any power, including negative and fractional exponents. | xⁿ means x multiplied by itself n times; x⁻ⁿ = 1/xⁿ; x^(1/n) = ⁿ√x |
| Standard Deviation Calculator | Compute sample and population standard deviation, variance and mean for a data set. | s = √( Σ(xᵢ − x̄)² ÷ (n − 1) ) [sample]; replace (n − 1) with n for a population |
| Probability Calculator | Convert favorable outcomes and total outcomes into a probability, percentage and odds. | P(event) = favorable outcomes ÷ total outcomes; P(not event) = 1 − P(event) |
| LCM Calculator | Find the least common multiple of two whole numbers, with the GCD shown too. | LCM(a, b) = (a × b) ÷ GCD(a, b) |
| GCF Calculator | Find the greatest common factor of two whole numbers using the Euclidean algorithm. | Euclidean algorithm: repeatedly replace (a, b) with (b, a mod b) until b = 0; the remaining a is the GCF |
| Scientific Calculator | A full scientific calculator with trigonometry, logarithms, powers and parentheses. | Direct evaluation of the entered expression using standard operator precedence |
| Random Number Generator | Generate truly even random numbers within any range, with optional uniqueness. | uniform integer in [min, max] via the browser's cryptographically secure randomness source |
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