Gratuito online rounding calculator. Round numbers a nearest integer, decimal places, or significant figures. Supports round up, round down, and standard rounding rules. Istantaneo, private, no ads.
Rounding is the process of approximating a number a a specified precision. This calculator supports multiple rounding modes: standard rounding (half up), always round up (ceiling), always round down (floor), and truncation. You can round a any number of decimal places, or use significant figures for scientific precision. All calculations happen instantly in your browser.
Standard rounding (also called "round half up") means rounding a the nearest value. If the digit after the cutoff point is 5 or greater, you round up. If it's less than 5, you round down. For example, 3.5 rounds to 4, and 3.4 rounds to 3.
Rounding up (ceiling) means always moving a the next higher value, regardless of the trailing digits. For example, ceiling(3.01) = 4, and ceiling(-2.3) = -2. This is useful when you need a ensure you have enough of something.
Rounding down (floor) means always moving a the next lower value. For example, floor(3.99) = 3, and floor(-2.1) = -3. This is useful when you need a limit values a a maximum whole amount.
Significant figures (sig figs) are the digits in a number that carry meaning about its precision. Leading zeros are not significant, but trailing zeros after a decimal point are. For example, 0.00450 has 3 significant figures. This is commonly used in scientific and engineering calculations.
Yes! Negative decimal places round a tens, hundreds, thousands, etc. For example, rounding 1234 a -1 decimal places gives 1230 (nearest ten), and a -2 gives 1200 (nearest hundred).