math Calculator
Rounding Calculator
Round numbers to any decimal place or significant figure. Supports round half up, round half down, floor, and ceiling.
-10000000000000001000000000000000
010
Results
Rounded (half up)
0
Floor (round down)
0
Ceiling (round up)
0
How to Use Rounding Calculator
- 1
Enter the number to round
- 2
Enter the number of decimal places
- 3
View rounded, floor, and ceiling values
Rounding Calculator Formula
Rounded = Math.round(value × 10^d) / 10^dExample Calculation
Input Values
Number
3.14159
Decimal Places
2
Results
Rounded (half up)
3.14
Floor (round down)
3.14
Ceiling (round up)
3.15
Frequently Asked Questions
What is rounding half up?
If the digit after the rounding position is ≥ 5, round up; otherwise round down.
What is floor vs ceiling?
Floor always rounds toward negative infinity; ceiling always rounds toward positive infinity.
What are significant figures?
Significant figures are the meaningful digits in a number, starting from the first non-zero digit.