30 tools
Calculators
Everyday calculators for percentages, loans, ages, tips and unit conversions. Free, instant, and no signup.
Free forever · nothing uploaded · no signup
- Percentage CalculatorCommon percentage calculations.
- BMI CalculatorBody mass index from weight and height.
- Aspect Ratio CalculatorSimplify or solve aspect ratios.
- Roman Numeral ConverterNumbers to and from Roman numerals.
- Unit ConverterLength, weight and temperature.
- Mean, Median & ModeBasic statistics for a list of numbers.
- Prime Number CheckerTest whether a number is prime.
- GCD & LCM CalculatorGreatest common divisor and least common multiple.
- Fibonacci GeneratorGenerate Fibonacci numbers.
- Number to WordsWrite a number out in words.
- Ordinal ConverterTurn 1 into 1st, 2 into 2nd.
- Fraction ↔ DecimalConvert fractions to and from decimals.
- Discount CalculatorWork out a sale price and savings.
- Compound InterestGrow a balance over time.
- Tip CalculatorSplit a bill and add a tip.
- Quadratic SolverSolve ax² + bx + c = 0.
- Permutations & CombinationsCalculate nPr and nCr.
- Simple InterestInterest without compounding.
- Circle CalculatorArea, circumference and diameter.
- Right Triangle CalculatorHypotenuse and area.
- Number FormatterAdd thousands separators.
- Scientific NotationConvert to and from e-notation.
- Loan / EMI CalculatorMonthly payment and total interest.
- Standard DeviationMean, variance and std dev.
- Prime FactorizationBreak a number into primes.
- Factorial CalculatorCompute n!.
- Sales Tax CalculatorAdd tax to a price.
- Margin & MarkupProfit margin and markup.
- GPA CalculatorCredit-weighted GPA.
- Weighted AverageAverage with weights.
- 1
Nothing is uploaded
Every tool on this page runs inside your browser tab. Your files are read from disk into memory and never sent anywhere.
- 2
No account, no cap
No signup, no email, no daily limit, no watermark, and no paid tier waiting behind the third file.
- 3
Keeps working offline
Load the page once and it still works with the network off, which is the clearest proof that nothing was ever being uploaded.