Math calculators
Work with expressions, percentages, fractions, ratios, averages and weighted grades using tools with clear formulas and examples.
Updated
Choose the calculation you need
Use the scientific calculator for a numerical expression, the fraction calculator when the exact rational answer matters, or the percentage calculator when a quantity is compared with a stated total. Ratio reduction and missing-term proportions handle ordered relationships.
For a list of equally weighted values, choose the arithmetic average. For percentage scores with different course weights, use the grade calculator instead. Its weights must total 100%; an unfinished assessment is not automatically a zero.
Check the setup
Read the mode and units before calculating. A wrong base can make a percentage arithmetically consistent but unsuitable for your question. DEG and RAD can likewise give different trigonometric results. The tool pages show the rules and examples so you can check the result.
Use the right kind of average or comparison
An arithmetic mean gives every observation equal weight. A weighted course result gives each assessment the share stated in a syllabus. A ratio compares ordered quantities, while a percentage needs an identified base. Choose the tool that matches that relationship before entering numbers; a plausible answer cannot repair the wrong setup.
For example, 15% of 80 is 12, but asking what percent 15 is of 80 produces 18.75%. Both calculations use the same two numbers and answer different questions. Write the unknown in a sentence first, then match it to the form's mode. For exact parts such as thirds, retain the fraction until the final reporting step rather than rounding it early.
These tools explain numerical methods and reject unsupported input. They do not solve symbolic proofs, infer units or decide an institution's policy. Keep the inputs and assumptions with a copied result so another person can reproduce it. No account is required, and the calculations run on your device.