Decimal hours

Convert hours and minutes to decimal hours and back.

Your dates and times stay in your browser and are not stored.

Method and assumptions

Method version 1.0.0 · Updated September 22, 2026

Hours and minutes → decimal

Formula: h + min / 60

Non-negative duration, not a time of day. Minutes range from 0 to 59; enter 0 if there are none. Example: 1 h 30 min = 1.5 h, not 1.30 h.

hours: Whole hours
minutes: Minutes

Decimal → hours and minutes

Formula: Total minutes = round(h × 60)

Rounded to the nearest minute; half a minute rounds up. Example: 1.025 h = 1 h 02 min. Converting back to decimals may therefore differ from the original input.

hours: Decimal hours

Gregorian calendar from years 0001 to 9999. Date, duration and rounding conventions are specified for each mode.

Calculate with code

These short examples use the same inputs and core calculation as this tool. Adapt validation and formatting to your application.

JavaScript

const decimalHours = 2 + 30 / 60;
console.log(decimalHours); // 2.5

TypeScript

const decimalHours: number = 2 + 30 / 60;
console.log(decimalHours); // 2.5

Python

hours, minutes = 2, 30
print(hours + minutes / 60)  # 2.5

Java

double decimalHours = 2 + 30 / 60.0;
System.out.println(decimalHours); // 2.5

double decimalHours = 2 + 30 / 60.0;
Console.WriteLine(decimalHours); // 2.5