Rounding Calculator
Round numbers using different methods: standard, up, down, banker's rounding, and significant figures.
Original Number
3.14159265359
Rounded to 2 decimal places
3.14
Rounded to 4 significant figures
3.142
All Rounding Methods
Round Half Up
3.14
Floor (Round Down)
3.14
Ceiling (Round Up)
3.15
Truncate
3.14
Common Rounding Places
To Integer3
To Tenths (0.1)3.1
To Hundredths (0.01)3.14
To Thousandths (0.001)3.142
Rounding Error
Absolute Error
1.5927e-3
Relative Error
0.050696%
What is Rounding?
Rounding replaces a number with a simpler value that's approximately equal. It's used when precision isn't needed or when simplifying calculations.
Rounding Methods
Standard: 5 rounds up. Banker's: 5 rounds to nearest even, reducing cumulative bias. Ceiling/Floor: always up/down.
Significant Figures
Significant figures indicate the precision of a measurement. They include all certain digits plus the first uncertain digit. Leading zeros are not significant.