Time Duration Calculator

Add and subtract hours and minutes, or convert minutes to hours.

Time Duration Calculator helps you add or subtract hours and minutes, or convert a minute total to h:mm. Enter hours a, minutes a, hours b, and minutes b, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Duration calculator does Time Duration Calculator is built for dates, durations, ages, and schedules. Add or subtract hours and minutes, or convert a minute total to h:mm. You enter hours a, minutes a, hours b, and minutes b, then Simple Calculators computes the result instantly. Calendar math follows common civil-calendar rules used in everyday planning. How the math works All values convert to minutes, then split back into hours and remaining minutes. The formula: Total minutes = hours × 60 + minutes. Add or subtract the minute totals, then divide by 60: the whole part is hours and the remainder is minutes.