Free Math & Science Calculators

Whether you're a student checking homework, a developer converting number bases, or anyone who just needs a quick, reliable answer, CrispToolHub's free math and science calculators cover the everyday arithmetic and beyond — with no sign-up, no ads interrupting the workflow, and nothing uploaded to a server.

The scientific calculator is the centrepiece: it handles trigonometry, logarithms, exponents, roots, factorials and constants like π and e, with a degree/radian toggle, memory keys, full keyboard support and a running history of your last calculations. For everyday questions about proportions, the percentage calculator offers six modes — find a percentage of a number, work out what percent one value is of another, calculate percentage change, add a markup or tax, subtract a discount, and reverse-engineer the original from a known percentage.

For number theory and fractions, the fraction calculator adds, subtracts, multiplies and divides fractions and shows the full working before simplifying to lowest terms. The prime number checker tests whether a number is prime, breaks any number into its prime factors, and lists every prime in a range; the LCM and HCF calculator finds the lowest common multiple and highest common factor of several numbers at once, with the prime-factorisation method shown step by step.

Rounding out the suite, the number base converter translates a value between binary, octal, decimal, hexadecimal and any custom base, with a bitwise-operations panel that's handy for programmers. The statistics calculator turns a list of numbers into mean, median, mode, standard deviation, variance and quartiles, and the Roman numeral converter goes both ways between numbers and Roman numerals. Pick a tool above to get started — each one is free, instant and private. Need graphs too? See how the suite compares as a Desmos alternative for real-world calculators.