Math Tools
Geometry, percentages, fractions, statistics — math utilities with formulas shown.
Overview
Math tools that hide their math aren't tools, they're cheating. Every calculator here shows the formula being applied — useful for students learning, professionals double-checking, and anyone who wants to understand (not just trust) the result. Coverage includes geometry, arithmetic, percentages, and combinatorics.
Common Use Cases
- →Calculate circle and triangle areas with formula explanations.
- →Convert fractions to decimals (and back) precisely.
- →Compute percentage change, markup, and margin.
- →Pick random numbers for statistical sampling.
Frequently Asked Questions
How precise are decimal-to-fraction conversions?
We find the simplest fraction within a tolerance you can configure (default 1e-6). 0.333333 → 1/3, 0.142857 → 1/7, etc. For repeating decimals, the tool detects the pattern when possible.
Are random numbers truly uniform?
Yes — we use crypto.getRandomValues, the same source used for cryptographic keys. Each value in your range is equally likely.
Can I solve equations?
Most math tools here are calculators, not symbolic solvers. For x² + 3x − 4 = 0 style equations, look for the quadratic equation solver specifically.
Percentage Calculator
Calculate percentages, increases, and differences easily.
Age Calculator
Calculate your exact age in years, months, and days.
Percentage Change Calculator
Calculate the percentage increase or decrease between two values.
fraction-to-decimal
Convert fractions to decimals.
decimal-to-fraction
Convert decimals to fractions.
Random Number Picker
Generate random numbers within a custom range instantly.
Circle Area Calculator
Calculate area, circumference, and diameter of a circle.
triangle-area-calculator
Calculate area of a triangle.