Rounding Calculator

Rounding is the process of replacing a number with a nearby value that is simpler or more convenient to work with, and this calculator covers every common rounding scenario in one place. You can round any number to a specific number of decimal places, or snap it to the nearest whole number, ten, hundred, thousand, or any other multiple you specify. The standard rounding rule used here is half-up: if the digit after your chosen cut-off point is 5 or more, the last kept digit increases by one; if it is 4 or less, the last kept digit stays the same. This is the rule taught in schools and used in everyday maths, accounting, and measurement. The calculator also shows you the ceiling, rounding always upward to the next step regardless of the following digit, and the floor, rounding always downward. These matter when the direction of error is important: you round quantities of materials up so you always have enough, and you might round a discount down so you never accidentally give more than intended. The tool also tells you the direction of the rounding that was applied, whether the result went up, down, or stayed the same. Enter any number and select your rounding target from the two options: a number of decimal places from zero to five, or a nearest multiple such as 10 or 100. Both options update in real time as you type. This calculator is useful for students checking homework, accountants tidying figures, engineers expressing measurements to the right precision, and anyone who regularly needs to round numbers clearly and correctly.

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