Math Calculators

Math is the one category of calculation almost everyone reaches for eventually — sometimes for homework, sometimes to check a discount in a shop, sometimes to make sense of a set of numbers at work. These calculators are built to give a fast, correct answer without forcing you to remember formulas or worry about operator precedence. Every tool runs entirely in your browser, so you can use it offline-minded, with nothing uploaded and no sign-up. **Arithmetic at a glance.** The Basic Calculator handles the four functions — addition, subtraction, multiplication, and division — with a familiar button layout and a running display, so you can see the expression you are building. The Scientific Calculator extends that with parentheses, exponents, square roots, logarithms, and the trigonometric functions (sine, cosine, tangent) plus a degrees/radians toggle. It honours proper operator precedence, so `2 + 3 × 4` is evaluated as `14`, not `20`, exactly as a physical scientific calculator would. **Fractions and percentages.** The Fraction Calculator takes two fractions and adds, subtracts, multiplies, or divides them, then reduces the result to its lowest terms so you never have to simplify by hand. The Percentage Calculator covers the three questions people actually ask most: what is X% of Y, what percent is X of Y, and what is the percentage change from X to Y. Switching between those modes keeps the right inputs in front of you instead of a single generic formula that's easy to misuse. **Statistics and randomness.** The Standard Deviation Calculator is the tool to reach for when you have a list of numbers — exam scores, measurement samples, daily figures — and need to know how spread out they are. Paste or type the values (separated by commas, spaces, or newlines) and it reports the sample size, mean, variance, and both the population and sample standard deviation, clearly labelled so you don't mix them up. The Random Number Generator uses your browser's cryptographically strong random source (not a weaker pseudo- random generator) and can produce one value or many at once across any range you choose, with a copy button on every result. Use these tools to check your own working, to explore "what if" scenarios, or simply to avoid arithmetic slip-ups on numbers that matter. When you need the steps, the formula and a worked example are shown on each page.