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From everyday percentages and bill splitting to statistics, equations, and savings scenarios. Practical calculators with clear formulas, explained assumptions, and no sign-up.
Percentage Calculator
Discounts, differences, and percentages made easy.
Open toolAspect Ratio Calculator
Simplify a ratio and resize dimensions proportionally.
Open toolAverage & Statistics Calculator
Find mean, median, sum, range, and population deviation.
Open toolCompound Interest
Explore how savings could grow over time.
Open toolDiscount Calculator
See the saving and final price after a discount and tax.
Open toolFraction Calculator
Add, subtract, multiply, or divide exact fractions.
Open toolGCD & LCM Calculator
Find a greatest common divisor and least common multiple.
Open toolLoan Payment Calculator
Estimate a fixed-rate monthly loan payment.
Open toolPercentage Difference Calculator
Compare two non-negative values symmetrically.
Open toolProfit Margin & Markup
Compare profit margin and markup on the same sale.
Open toolQuadratic Equation Solver
Solve real or complex roots of ax² + bx + c = 0.
Open toolSales Tax Calculator
Add an entered tax rate or extract it from an inclusive price.
Open toolSavings Goal Calculator
Find a monthly contribution for a hypothetical savings goal.
Open toolScientific Calculator
Evaluate arithmetic, powers, functions, and factorials.
Open toolSimple Interest Calculator
Calculate interest without compounding.
Open toolTip & Bill Splitter
Work out the tip and split the bill fairly.
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Clear inputs. Explained assumptions. Answers on your device.