Truncate Calculator

Use our free truncate calculator to cut off a number at a specified number of decimal places without any rounding. Shows the truncated result, the discarded portion, and comparisons with floor and ceiling.

Math

Number

Decimal Places

Formula

Truncate a number to a given number of decimal places — extra digits are simply dropped without any rounding. Shows the discarded portion and compares with floor (positive numbers) and ceiling (negative numbers).

trunc(x, n) = keep n decimal digits, discard the rest

Percentage: The percentage value you want to apply

Number: The original number or value

Result: The calculated result

How It Works

1Enter a number.
2Choose how many decimal places to keep (0-15).
3Click Calculate.

Examples

trunc(3.14159, 2)

1.3.14159 → keep 2 decimals → 3.14 (discard 0.00159)

Result: 3.14

trunc(-3.14159, 1)

1.-3.14159 → keep 1 decimal → -3.1 (discard 0.04159)

Result: -3.1

Frequently Asked Questions

Truncation simply discards extra decimal digits without any rounding. It is equivalent to floor for positive numbers and ceiling for negative numbers.

Truncation never rounds up — it just cuts off extra digits. Rounding can increase the last kept digit.

Only for positive numbers. For negative numbers, floor rounds down (more negative) while truncation rounds toward zero.

Related Calculators

Round Number Calculator Ceiling Calculator Floor Calculator Precision Calculator Percentage Calculator Basic Calculator

CalculateMe Team

Last updated: 2026-07-15

Truncate Calculator

Formula

How It Works

Examples

trunc(3.14159, 2)

trunc(-3.14159, 1)

Frequently Asked Questions

What is truncation?

How is truncation different from rounding?

Is truncation the same as floor?

Related Calculators

Truncate Calculator

Formula

How It Works

Examples

trunc(3.14159, 2)

trunc(-3.14159, 1)

Frequently Asked Questions

What is truncation?

How is truncation different from rounding?

Is truncation the same as floor?

Related Calculators