Hours Calculator

Add or subtract hours and minutes.

Hours Calculator helps you add or subtract hours and minutes. 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 Hours calculator does Hours Calculator is built for dates, durations, ages, and schedules. Add or subtract hours and minutes. 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 Choose an Operation, Add or Subtract, then enter Hours A and Minutes A, and Hours B and Minutes B. Both are turned into minutes (hours × 60 + minutes), combined, and split back into hours and minutes. The answer is also given as decimal hours, as h:mm:ss, and in days, hours and minutes. This works with lengths of time, not times on a clock. The formula: Total minutes = (hours A × 60 + minutes A) ± (hours B × 60 + minutes B). Divide the total by 60: the whole number is hours and the remainder is minutes.