This online tool converts time given as hours and minutes (h, hr; min; sec) into decimal hours (h in base-10). Useful for payroll, billing, time tracking, and logs.

Time: Hours, Minutes & Seconds ➜ Decimal Hours

Enter hours, minutes, and seconds; get decimal hours. Adjust decimal places if needed.

Hours

Minutes

Seconds

Result in Decimal Hours

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Decimal Places
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How to use it

  1. Enter whole hours in the Hours field.
  2. Enter minutes (0–59) in the Minutes field. Optionally enter seconds.
  3. Set Decimal Places (0–6) to control rounding.
  4. Click Convert to get decimal hours in the Result field.
  5. Use Copy Result to place the value on your clipboard (adds a checkmark when copied).
  6. Clear All resets inputs, decimal places, and output.
  7. Press Enter in any input to run the conversion.

Units and definitions

Decimal hour (h, base-10): The hour expressed as a decimal value where minutes are converted by minutes ÷ 60. Example: 1 h 30 min = 1.5 h; 15 min = 0.25 h. Decimal hours are common in payroll and aviation logs. System: derived from hour (non-SI unit accepted for use alongside SI).

Hour (h, hr): Unit of time equal to 60 minutes or 3,600 seconds. Exact relation: 1 h = 60 min = 3,600 s. In SI terms, 1 h = 3,600 × the SI base unit second (s). System: non-SI, accepted for use with SI and used internationally (not specific to imperial/US only).

Minute (min): Unit of time equal to 60 seconds and 1/60 of an hour. Exact relation: 1 min = 60 s = 1/60 h ≈ 0.016 666 7 h. In SI terms, 1 min = 60 s (second is the SI base unit). System: non-SI, accepted for use with SI and used internationally.

Second (s): SI base unit of time. Exact relation: 1 s = 1/60 min = 1/3,600 h. For reference: 0.1 h = 6 min = 360 s; 0.01 h = 0.6 min = 36 s. System: SI base unit.

Conversion formula

Decimal hours = hours + (minutes ÷ 60)

Source: hour and minute are defined with exact relations 1 h = 60 min and 1 min = 60 s in the NIST Guide to the SI, Chapter 5: Units Outside the SI — NIST Special Publication 811, Chapter 5.

Time in Hours, Minutes, Seconds to Decimal Hours Converter

Conversion table

Hours:MinutesDecimal Hours
0:010.0167
0:150.25
0:300.5
0:450.75
1:001
1:071.1167
1:121.2
1:301.5
1:451.75
2:052.0833
2:302.5
2:592.9833
3:153.25
3:453.75
4:104.1667
5:005
6:306.5
7:457.75
8:208.3333
9:599.9833

Real-world examples

  • NBA regulation quarter — 12 min = 0.20 h
  • NFL regulation quarter — 15 min = 0.25 h
  • NHL regulation period — 20 min = 0.3333 h
  • FIFA soccer half (regulation) — 45 min = 0.75 h
  • FIFA extra-time period — 15 min = 0.25 h
  • NCAA men’s basketball half — 20 min = 0.3333 h
  • NCAA women’s basketball quarter — 10 min = 0.1667 h
  • FIBA basketball quarter — 10 min = 0.1667 h
  • TV half-hour program slot — 30 min = 0.50 h

What’s your use case, and do you need other features? Tell us in the comments.

CalcuLife.com