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.
Best uses
Start here if one of these sounds like your job. The examples below show which inputs matter most.
- Round money, measurements, and everyday decimal values.
- Round study answers to a required number of significant figures.
- Round whole numbers to tens, hundreds, thousands, or decimal places.
- Compare nearest, round up, round down, and truncate methods.
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.
Worked examples for Rounding Calculator
12.35
98,800
1,800
FAQ in plain language
What rounding modes are supported?
The calculator supports decimal places, significant figures, and place value rounding.
How do I round to a place value?
Use place-value mode. Exponent 1 means nearest 10, exponent 2 means nearest 100, exponent 3 means nearest 1,000, and exponent -2 means nearest 0.01.
What do the main Rounding Calculator inputs mean?
The main inputs are the numbers, operation, mode, or known values the calculator needs. Keep units consistent, enter percentages the way the page label shows, and use the examples as a quick check before trusting the answer.
How should I read the Rounding Calculator answer?
Read the headline answer, then check the supporting lines and examples to understand how the calculator got there. If one input changes, rerun the tool and compare the new answer instead of guessing.
What should I double-check before trusting the Rounding Calculator?
Check units, signs, rounding, and the selected mode before copying the answer. If the number feels weird, rerun one of the examples first, then put your own values back in slowly.
What is the difference between nearest, up, down, and truncate?
Nearest rounds to the closest value. Up uses the next higher rounding value, down uses the next lower rounding value, and truncate drops extra digits toward zero.
Can I round negative numbers?
Yes. The calculator accepts negative numbers. For nearest rounding, half values move away from zero.
Sources
Use these if you want to compare the formula, inputs, or limits with a trusted outside explanation.
Related tools
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Keep exploring
If this guide is close but not exact, these links keep you near the same kind of problem.
- Calculators Browse the full category for related tools that help with the same job.
- All free tools Search the complete Access Free Tools library by task, category, or tool name.
- All calculator and utility guides Find more plain-language examples, formulas, mistakes, and result explanations.
- Free calculator resources Start here when you are not sure which calculator page fits.
Privacy and copying results
Recent answers stay visible only while you work in the current browser tab. They are not sent to a server.
Use Copy answer when you want to save the inputs and result in notes, homework, a message, or a project list. Check the units, labels, and limits before copying.