Add Times Calculator

Add multiple time durations together in hours, minutes, and seconds. Get results in HH:MM:SS, decimal hours, total minutes, and total seconds.

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How to Add Time Durations

Adding times manually requires carrying values — 60 seconds become a minute, 60 minutes become an hour. This calculator handles all the carrying automatically.

Manual Method

Add seconds. If the total is 60 or more, subtract 60 and carry 1 to minutes.
Add minutes (plus any carry). If 60 or more, subtract 60 and carry 1 to hours.
Add hours (plus any carry).

Example

Add 2:48:30 + 4:17:45:

Seconds: 30 + 45 = 75 → write 15, carry 1
Minutes: 48 + 17 + 1 = 66 → write 06, carry 1
Hours: 2 + 4 + 1 = 7
Result: 7:06:15

Decimal Hours Conversion

Minutes	Decimal
5 min	0.08
10 min	0.17
15 min	0.25
20 min	0.33
30 min	0.50
45 min	0.75

Common Uses

Timesheet totals: Sum daily work hours for weekly payroll.
Exercise tracking: Add up workout durations across multiple sessions.
Travel planning: Total flight times including layovers.
Project management: Sum task durations for total project time.
Cooking: Add prep time, cook time, and rest time for total recipe duration.
Music/video production: Calculate total runtime of tracks or clips.

Time Units Reference

Unit	Equivalent
1 minute	60 seconds
1 hour	60 minutes / 3,600 seconds
1 day	24 hours / 1,440 minutes / 86,400 seconds
1 week	168 hours / 10,080 minutes
Standard work week	40 hours / 2,400 minutes

Tips for Accurate Time Tracking

Round to the nearest quarter hour (15 min) for simple payroll — use exact times for billing.
When adding many small durations, seconds add up fast. Always include them for accuracy.
Decimal hours are easier for multiplication (e.g., 7.5 hours × $25/hr = $187.50).

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Frequently Asked Questions

How do I add hours and minutes together?

Add the hours and the minutes separately, then turn every 60 minutes into one hour. For 2:48 plus 4:17, the minutes total 65, which is 1 hour 5 minutes, and the hours total 6, so the answer is 7:05. Seconds carry the same way, with every 60 seconds becoming one minute.

How do I convert minutes to decimal hours?

Divide the minutes by 60. 45 minutes is 45 / 60 = 0.75 hours, so 3 hours 45 minutes is 3.75 decimal hours, and 7 hours 30 minutes is 7.5. Timesheets and payroll systems use decimal hours because they can be multiplied directly by an hourly rate, while a value written as 7:30 cannot.

How do I total work hours for a week?

Add each day as hours and minutes, then carry every 60 minutes into an hour. A week of 8:30, 7:45, 8:00, 8:15 and 7:30 adds up to exactly 40 hours, because the minutes total 120, or 2 hours, on top of 38 whole hours. In decimal form that is 40.0 hours for payroll.

What is 90 minutes in hours and minutes?

90 minutes is 1 hour and 30 minutes, or 1.5 decimal hours. To convert any minute total, divide by 60: the whole number is the hours and the remainder is the minutes, so 150 minutes is 2 hours 30 minutes and 200 minutes is 3 hours 20 minutes. The same rule turns 90 seconds into 1 minute 30 seconds.