Add, subtract, multiply, divide and take percentages. Works with your keyboard, stores nothing, and needs no sign-up.
Yes, and it's faster than clicking. Number keys and the decimal point enter digits, + − * / apply operators, Enter or = calculates, Backspace deletes the last digit, Escape clears everything, and % converts the current entry. The numeric keypad works exactly like the top row.
No — deliberately. Like a physical desk calculator it evaluates left to right as you type, so 2 + 3 × 4 gives 20, not 14. It adds 2 and 3 to make 5, then multiplies by 4.
That surprises people who expect algebraic precedence, but it's the right behaviour for a running tally: adding up a shopping list and applying tax at the end works the way you'd do it on paper. If you need true precedence and brackets, the Scientific Calculator parses a full expression before evaluating it.
Because it's rounded, and it should be. Computers store decimals in binary, and neither 0.1 nor 0.2 has an exact binary representation — so the raw arithmetic returns 0.30000000000000004. That isn't a bug in the calculator; it's how IEEE 754 floating-point numbers work in every language.
Results here are rounded to 12 significant figures, which erases the artefact while leaving far more precision than any everyday calculation needs. It's also why financial software stores money as integer cents rather than decimals: accumulating that tiny error across thousands of transactions eventually shows up in a total.
It divides whatever is on screen by 100 — so 250 % becomes 2.5. To take 15% of 80, enter 80 × 15 % =.
Percent keys behave inconsistently across calculators, which is a genuine source of confusion. Some treat 200 + 10 % as "add 10% of 200" and return 220; others return 200.1. This one keeps the rule simple and predictable: percent always means divide by one hundred. For percentage change, increase, decrease, or "what percent of", the Percentage Calculator answers those directly rather than making you build them from keystrokes.
The calculator runs entirely in your browser. Nothing you type is sent to a server, saved, or logged, and once the page has loaded it keeps working offline. That's true of every tool on this site.
A basic calculator is the right tool when you know exactly what arithmetic you want. When the question is which arithmetic, a purpose-built tool saves the setup: monthly payments on a loan, growth on a savings balance, splitting a restaurant bill, or converting units.
Need exponents, roots, logs or trigonometry? Use the Scientific Calculator, which also handles brackets and proper order of operations. For percentage questions specifically, the Percentage Calculator is quicker, and for fractions rather than decimals see the Fraction Calculator. Working with money? Start with the Loan Calculator or the Budget Calculator.