A free online calculator for everyday arithmetic and scientific expressions, with a history of your recent results. Works without an internet connection.
The calculator reads a whole expression, not one key at a time. It splits the text into numbers, operators, function names and parentheses, builds the expression as a tree, and then works the tree out. This is why 2 + 3 * 4 gives 14 and (2 + 3) * 4 gives 20. The order the keys were pressed in makes no difference to the answer.
The order of operations is the usual one. Parentheses come first, then functions such as sqrt and sin, then a power written with ^, then multiplication and division, then addition and subtraction.
sqrt, log, ln, sin, cos, tan, asin, acos and atan are all available, and pi and e name their constants. log is the base-10 logarithm and ln is the natural one. The trigonometric functions read degrees until you set the angle mode to radians.
The whole calculation happens in your browser. The expression never reaches a server.
Write (1240 + 1240 * 18%) / 4. The result is 365.8.
The percent sign divides the number in front of it by 100, so 18% is 0.18. The parentheses add the tip to the bill before the division, because division would otherwise run first.
Write pi * 4.5 ^ 2. The result is 63.6172512352.
The power runs before the multiplication, so the radius is squared first. No parentheses are needed around 4.5 ^ 2.
100 + 10% add ten percent?No. It gives 100.1. The percent sign turns the number in front of it into a fraction, so 10% is 0.1 and the calculator adds 0.1 to 100. To add ten percent, write 100 * 110%, which gives 110. Many pocket calculators read the same keys as "add ten percent of the first number". This one does not guess what the percent belongs to.
Yes. The calculator is written in JavaScript and runs in the browser. Nothing you type is sent anywhere, there is no account, and nothing is kept after the browser tab closes.
Yes. The application is stored in the browser after your first visit, so the calculator opens and works offline.
Degrees, until you change the angle mode. sin(30) gives 0.5 in degree mode. In radian mode the same expression gives about −0.988, because 30 radians is nearly five full turns.
A result is rounded to 12 significant digits. A number above 1e12, or below 1e-9, is shown in scientific notation instead.
The rounding also hides an old surprise. A computer holds a decimal fraction in binary, and 0.1 + 0.2 is 0.30000000000000004 in that form. Rounding at 12 digits shows the 0.3 you expected.
No. The calculator keeps no record of what you work out. The expression and its result live only on the page in front of you, and nothing is written to the browser or sent to a server.
A JavaScript number carries about 15 to 17 significant decimal digits. The calculator shows 12 of them, which leaves the last few, where binary rounding shows up, out of sight.
The percent sign grew out of the Italian "per cento", written short by clerks until the letters turned into the symbol.
For a loan instalment and its full repayment schedule, use the EMI Calculator. For a rate of growth between two amounts, use the CAGR Calculator.