Method
The number is scaled by 10^places, the selected integer-rounding rule is applied, then the scale is restored.
Math worksheet
Rounding Calculator
Round a decimal by places or significant figures and compare half-away, half-even, floor, ceiling and truncation rules.
The calculation runs locally. Exact-integer tools avoid floating point; decimal and transcendental tools report rounding limits.
Method and verification guide
How the Rounding Calculator works
The number is scaled by 10^places, the selected integer-rounding rule is applied, then the scale is restored. The calculator keeps the intermediate values visible so you can reproduce the answer independently.
Interpret the result
Different tie and direction rules can produce different answers, especially for negative numbers and exact halfway cases.
Check the assumptions
This implementation uses binary floating-point input; exceptionally sensitive decimal ties should be checked with a decimal-arithmetic system.
Local calculation
Everything runs in this browser. Inputs are not sent to an external calculator.
Rounding
Displayed values may be rounded for readability while calculations use full floating-point precision unless the tool explicitly uses exact integers.
Scope
This implementation uses binary floating-point input; exceptionally sensitive decimal ties should be checked with a decimal-arithmetic system.
Simple by design
Three steps to a clearer number.
Enter your details
Use realistic values in each field. You can change them anytime.
Calculate instantly
The formula runs locally, so there is no account or waiting time.
Use the result
Treat the answer as a practical estimate for your next decision.