Add Minutes Calculator

Updated 4 November 2026 · Standard formula, shown below

New time (24-hour clock) 17:05

Days later: 0 days; Result
Time added: 2:30:00 h:mm:ss; Result
Start hour (0-23): 14 h; You entered

This calculator adds a number of minutes to a time of day. Enter the start time on the 24-hour clock and the minutes to add, and you get the new hour and minute, how many days later it falls and the added time in hours and minutes.

Formula

Convert the start to minutes after midnight: T = h × 60 + m + minutes to add. The new hour is ⌊(T mod 1440) ÷ 60⌋, the new minute is T mod 60, and the days later is ⌊T ÷ 1440⌋ (1440 minutes in a day).

h: start hour, 0-23 (2 pm = 14)
m: start minute, 0-59
add: minutes to add (whole or decimal)

Worked Example

Start 14:35 (2:35 pm), add 150 minutes.

14 × 60 + 35 = 875 minutes after midnight; 875 + 150 = 1,025
1,025 mod 1,440 = 1,025; 1,025 ÷ 60 = 17.08, so the hour is 17
1,025 mod 60 = 5, so the minute is 5: the new time is 17:05 (5:05 pm)
⌊1,025 ÷ 1,440⌋ = 0 days later; 150 minutes = 2:30:00

On a 24-hour clock the new time is 17:05. Past midnight the calculator adds the day, for example 22:50 + 95 minutes = 00:25 (+1 day).

Limits and common mistakes

Use the 24-hour clock for the start: 2:35 pm is 14 and 35.
To subtract minutes, enter a negative number only if the result stays on the same day; for earlier days count back by 1,440 per day.
Daylight-saving changes are not applied.

Formula used

in h | Start hour (0-23) | h | 14 | 0
in m | Start minute (0-59) | min | 35 | 0
in add | Minutes to add | min | 150 | 0
out nt | New time (24-hour clock) | - | h * 60 + m + add | clock
out dl | Days later | days | floor((h * 60 + m + add) / 1440) | 0
out dur | Time added | h:mm:ss | add | time

Each line is one input (in, sel, list) or one result (out: label, unit, formula, decimals). How the calculators work

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.