Math Calculators

Everyday and Academic Math, Made Simple

This page brings together every math calculator on allcaltools in one place. Some of these tools are things you reach for constantly — working out a percentage, finding the average of a list of numbers, or simplifying a fraction. Others are more specialized, built for a specific kind of problem: the LCM & GCF calculator for number-theory questions, the scientific calculator for trigonometry and logarithms, and the decimal-to-time calculator for turning a timesheet entry like 7.5 hours into an exact HH:MM:SS value.

Whether you're a student checking homework, a professional double-checking a spreadsheet figure, or just working out a discount at the till, every tool here calculates instantly as you type — there's nothing to install, no account to create, and no sign-up wall. Each calculator also shows its working, not just a bare answer, so you can see how the result was reached and use it to actually learn the underlying method rather than just copy a number.

All seven calculators are free, unlimited to use, and run entirely in your browser — your inputs are never uploaded to a server or stored anywhere.

Which calculator do I need?

Not sure which tool fits your problem? Here's a quick way to decide. Working out a discount, a tip, or an exam score, or trying to figure out a percentage increase or decrease? Reach for the Percentage Calculator. Need the mean, median, mode, or range of a data set — say, a list of test scores or monthly expenses? The Average Calculator handles all four at once with a visual chart. Doing fraction arithmetic — adding, subtracting, multiplying, or dividing two fractions and simplifying the result? That's the Fraction Calculator. Need the LCM (Least Common Multiple) or GCF (Greatest Common Factor) for a math problem, complete with the prime factorization behind it? Use the LCM & GCF Calculator. Working through trigonometry, logarithms, powers, roots, or anything needing parentheses and a degree/radian toggle? The Scientific Calculator is built for exactly that, with a running calculation history. If you're converting a decimal-hours timesheet entry — like 7.5 hours — into an exact hours, minutes, and seconds breakdown, the Decimal to Time Calculator does that instantly with a worked example. And if you need to draw one or many random numbers for a raffle, dice roll, or lottery pick — unique or repeating, sorted or not — the Random Number Generator uses your browser's cryptographically secure random source rather than a biased shortcut.

Frequently Asked Questions