Rounding Calculator
Round a number up, down, or to the nearest value, to any number of decimal places, live as you type.
Updates live as you type. Runs entirely in your browser.
What is Rounding Calculator?
Type a number, choose round/round-up/round-down, and how many decimal places, and get the result instantly — useful for currency, measurements, or any calculation that needs a specific precision. A quick way to double-check how a value should round before hardcoding that logic in code, or to settle a disagreement about whether a price or measurement should round up or down at a given decimal place. Calculation happens live in your browser as you type.
FAQ
Round finds the nearest value (rounding .5 up); round up (ceiling) always moves away from zero to the next representable value at your chosen precision; round down (floor) always moves toward negative infinity.
Round up (ceiling) and round down (floor) follow standard mathematical convention — ceiling always moves toward positive infinity and floor toward negative infinity, so "round up" on -1.5 gives -1, not -2.