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 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, with nothing uploaded and no sign-up.

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 honors proper operator precedence, so 2 + 3 × 4 is evaluated as 14, not 20, exactly as a physical scientific calculator would. 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 is easy to misuse. When you need to see the steps, both pages show the formula and a worked example below the result. 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 do not 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. Because the formula and a worked example sit beside every answer, the tools also double as a way to check your own arithmetic, not just to produce a number.

Start with the kind of number problem in front of you. If you just need a sum or a running total, the Basic Calculator is enough; if the expression has powers, roots, or trig, switch to the Scientific Calculator. If the inputs are fractions or a percentage question, use the Fraction or Percentage calculator rather than doing the algebra by hand. For a list of values, the Standard Deviation Calculator turns raw numbers into a spread you can reason about, and for any time you need an unpredictable value, the Random Number Generator covers it. None of these tools require an account, and because the formula and a worked example sit on each page, they also work as a quiet way to check your own working.