Math tools
11 free math tools · Percentages, fractions, units and grades
Find a percentage change, simplify a fraction, compare a set of numbers or convert a measurement. Start by checking the units and what each input means: a percentage share needs a whole, while a change needs a starting value. For grades, use the weights and rounding rules from your course.
All math tools
- Percentage calculator Work out percentage changes, shares, increases and discounts.
- Unit converter Length, mass, volume, temperature conversions.
- Fraction calculator Add, subtract, multiply or divide fractions and simplify.
- Average calculator Find the mean, median, mode and spread of a list of numbers.
- Ratio calculator Simplify a ratio, see shares, and solve a : b = c : x.
- Number base converter Convert between binary, octal, decimal, hex and base 36.
- Roman numeral converter Numbers to Roman numerals and back, with validation.
- GCD & LCM calculator Greatest common divisor and lowest common multiple.
- Quadratic equation solver Solve ax² + bx + c = 0, including complex roots.
- Scientific notation converter Convert to scientific and engineering notation.
- Grade & final exam calculator Work out your grade, or the exam score you need to hit a target.
Guides for these tasks
- Percent vs percentage points: a small wording difference that changes the number An interest rate rising from 2% to 3% is one percentage point, and also a 50% increase. Why the two phrasings differ, and the percentage traps hiding in everyday claims.
- How weighted grades and required final-exam scores are calculated Calculate a points-based or weighted grade, handle ungraded categories, and work out a required final-exam score using your course's actual rules.
- Ounces vs fluid ounces: choose the scale or the measuring jug Convert ounces to grams and fluid ounces to millilitres, distinguish US and imperial measures, and check ambiguous recipe quantities before measuring.
- MB vs MiB: why a 1 TB drive shows up as 931 GB Compare decimal MB and GB with binary MiB and GiB, understand the 931 GB display on a 1 TB drive and distinguish capacity from free space.
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