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Rounding Calculator

Round, floor or ceil to a decimal place.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Negative decimal places round to tens, hundreds and so on. Nearest follows JavaScript rounding: exact halfway cases go toward positive infinity. Results use floating-point arithmetic. All calculations stay in your browser.

How to use it (step by step)

  1. 1Fill in the boxes: “Number”, “Decimal places (negative for tens)”, “Mode”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Rounding / modulo
Rounding makes a number simpler (4.67 → 4.7). Modulo is the remainder after dividing (10 mod 3 = 1).

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