Quick start
- Choose Decimal places, Significant figures, or Place value.
- Choose the rounding method.
- Enter the value and precision.
- Press Round value, then review the rounded answer, difference, and steps.
Choosing a rounding mode
Decimal places count digits after the decimal point. Significant figures count meaningful digits in the whole number. Place value rounds by powers of 10, such as nearest ten, hundred, or thousand.
In place-value mode, exponent 2 means nearest 100 and exponent -2 means nearest 0.01.
Choosing a method
Nearest rounds to the closest value. Round up moves to the next higher rounded value, round down moves to the next lower rounded value, and truncate removes extra digits toward zero.
Use the examples when you want to quickly switch between common cases like two decimal places or three significant figures.
Examples from the calculator
12.35
98,800
1,800
History, privacy, and copying
Recent answers stay visible in the page while you work. The history is kept only in the current browser tab and is not sent to a server.
Copy answer copies the expression and result so you can paste it into notes, homework, a message, or another document.