This rounding calculator compares what happens to the same number under different rounding rules. Enter a number, choose a mode, and set the decimal precision to see the original value, the rounded result, and the difference caused by the rule.
The page has five actual modes: round, ceil, floor, trunc, and bankers. It is useful for report formatting, programming, classroom work, data cleanup, and result verification. For percentage changes, use the percentage calculator; for decimal and fraction conversion, use the decimal-fraction converter.
floor and trunc.2.5 and 3.5.Enter the finite numeric value to process. Positive, negative, and decimal values are supported. Negative values are especially useful because they make number-line direction and toward-zero truncation easy to see.
The page provides five modes:
It supports round, ceiling, floor, truncation, and banker's (half-to-even) rounding.
The page supports 0 through 10 decimal places. At 0, the rule is applied at the whole-number level, and the display keeps the selected number of trailing zeros.
Floor always moves toward negative infinity, while truncation moves toward zero, so -2.37 at one decimal place becomes -2.4 and -2.3 respectively.
Round follows JavaScript Math.round for nearest values, including its exact-half behavior; banker's rounding chooses the even endpoint at a midpoint.
No. It is useful for learning, development, and verification; formal settlement should follow your accounting rule, contract, or system implementation.
Round to 0-10 decimal places with round, ceiling, floor, truncate, and banker's modes, and view the original value and difference.