What are significant figures?

Meaningful digits: 0.00456 has 3 sig figs (4, 5, 6). Leading zeros don't count.

What is banker's rounding?

Round half to even (2.5→2, 3.5→4). Reduces bias in financial calculations.

Floor rounds down (items that fit); ceiling rounds up (boxes needed to pack items).

Round numbers to decimal places or significant figures. Shows standard, floor, ceiling, and truncation results side-by-side.

Complete User Guide

Enter a number. Set decimal places, significant figures, and round-to-nearest value. All four rounding modes show simultaneously.

The Mathematical Formula

Round half-up: floor(x + 0.5)

Half-up: round(3.5)=4. Floor: ⌊3.7⌋=3. Ceiling: ⌈3.2⌉=4. Truncation: drop decimal (3.9→3). Sig figs: 3.14159 to 3 sig figs = 3.14.

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