Rounding Calculator
Round a number to a chosen number of decimal places, or up/down/towards zero.
Enter values
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Step by step
The formula
scale by 10ᵈ, apply the rounding rule, scale back
Rounding shifts the decimal point, applies a rule, then shifts back. The rules differ in ways that matter with negatives: floor sends −2.5 down to −3, while "towards zero" simply truncates it to −2. Choose deliberately when money or measurements are involved.
All calculations run locally in your browser and update instantly as you type.
Example calculations
Common questions this calculator answers — select one to load its values.
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Frequently asked questions
What is “towards zero” rounding?+
It simply drops the extra digits (truncation), so 2.78 becomes 2 and −2.78 becomes −2 — unlike floor, which would give −3.
All calculations run locally in your browser. Nothing you type is sent to a server.