Rounding Calculator
Round a number to any number of decimal places or significant figures.
Rounding to a specific number of decimal places — or rounding strictly up or down — comes up constantly in finance, measurement, and reporting where precision needs to be controlled.
Round, round up, and round down are all different
Standard rounding goes to the nearest value regardless of direction. Rounding up (ceiling) always moves toward the larger number, even for values like 2.01. Rounding down (floor) always moves toward the smaller number — the right choice depends on your specific use case, like inventory counts that must round up.
Frequently asked questions
What happens at exactly .5 — does it round up or down?
This uses standard "round half up" convention (2.5 rounds to 3) — some systems use "round half to even" (banker's rounding) instead, which can produce a different result for exact halfway values.
Why would I need to round to a specific number of decimal places?
Financial figures typically round to 2 decimal places (cents), while scientific or engineering contexts may need more or fewer places depending on required precision.