Math & Scientific Calculators
Solve percentages, fractions, ratios, algebra, geometry, statistics and scientific expressions with focused tools. This hub groups closely related tools so you can move from a broad question to the calculator that matches the exact job.
Each calculator opens with the working tool first, followed by the formula or method, a worked example, input guidance, common mistakes and related calculators. That keeps the category useful for quick calculations while still giving enough context to verify the result.
Calculator groups in this section
Everyday Math
Percentages, fractions, ratios and number tools.
- Percentage Calculator — Find a percentage of a number or determine what percent one value is of another.
- Percent Change Calculator — Calculate percentage increase or decrease between two values.
- Percentage Increase Calculator — Increase a value by a chosen percentage.
- Fraction Calculator — Add, subtract, multiply or divide two fractions.
- Factor Calculator — List all positive factors of an integer.
- LCM Calculator — Find the least common multiple of two integers.
- GCF Calculator — Find the greatest common factor of two integers.
- Ratio Calculator — Simplify a ratio to its lowest whole-number terms.
- Proportion Calculator — Solve a proportion when one of four values is unknown.
Algebra & Geometry
Solve equations, slope, area and volume problems.
- Slope Calculator — Calculate slope, rise and run from two coordinate points.
- Area Calculator — Calculate the area of common 2D shapes.
- Volume Calculator — Calculate the volume of boxes, cylinders, spheres and cones.
- Algebra Calculator — Solve linear equations and quadratic equations.
Advanced Math
Scientific expressions, statistics, graphs and numerical integration.
- Scientific Calculator — Evaluate scientific expressions with trig, logs, roots and powers.
- Math Calculator — A clean calculator for everyday arithmetic and expressions.
- Statistics Calculator — Calculate count, mean, median, range and standard deviation.
- Integral Calculator — Approximate a definite integral numerically using Simpson’s rule.
- Graphing Calculator — Plot a mathematical expression over a chosen x-range.
How to choose the right calculator
Start with the question you are trying to answer, not just the number you already have. A focused calculator usually gives clearer inputs and a more useful result than a general-purpose tool. If your problem changes units, formula type or planning goal, follow the related-calculator links instead of reusing a tool that was built for a different purpose.
Accuracy, assumptions and rounding
Simple mathematical and unit-conversion tools follow fixed relationships. Finance, health, construction, automotive and other planning calculators may also depend on assumptions you supply. Review the method on the individual calculator page, keep units consistent, and treat estimates as planning information rather than professional advice or a guaranteed real-world outcome.
See our calculator methodology for more detail about formulas, browser-based processing, units, rounding and update practices.