Converts decimal hours (h, base-10) into standard time written as hours and minutes (h, hr; min). It makes decimal time values easier to read and use in schedules, logs, and daily planning.

Decimal Hours to Hours, Minutes & Seconds Converter

Enter decimal hours; get hours, minutes, and seconds (HH:MM:SS). Seconds rounding is configurable.

Decimal Hours

Result in Hours • Minutes • Seconds

Swap
Calculation process will appear here.
Second Decimals
Share this?
WhatsApp X Telegram Facebook LinkedIn Reddit

How to use it

  1. Enter a number in Decimal Hours (for example, 1.75).
  2. Set Minute Decimals (0–2) to decide how precisely minutes should be rounded.
  3. Click Convert to see hours and minutes displayed in both text (e.g., 1 h 45 min) and clock style (01:45).
  4. Copy Result to copy the full converted value to your clipboard (button confirms with a checkmark).
  5. Clear All resets all fields.
  6. You can also press Enter in an input to run the conversion.

Units and definitions

Decimal hour (h, base-10) — A representation of time where the fractional part of the hour is expressed in tenths, hundredths, etc., instead of minutes. Example: 1.25 h = 1 hour 15 minutes. System: derived from the hour, widely used in payroll, billing, and aviation logs.

Hour (h, hr) — Unit of time equal to 60 minutes or 3 600 seconds. Exact relations: 1 h = 60 min = 3 600 s. Non-SI unit, accepted for use with SI.

Minute (min) — Unit of time equal to 60 seconds and 1/60 of an hour. Exact relations: 1 min = 60 s = 1/60 h ≈ 0.016 666 7 h. Non-SI unit, accepted for use with SI.

Second (s) — SI base unit of time. 1 s = 1/60 min = 1/3 600 h. For reference: 0.01 h = 36 s. System: SI base unit.

Conversion formula

hours = floor(decimal_hours)
minutes = (decimal_hours − hours) × 60

Source: definitions of hour and minute from NIST Special Publication 811, Chapter 5.

Conversion table

Decimal HoursHours:Minutes
0.100:06
0.250:15
0.500:30
0.750:45
1.001:00
1.201:12
1.501:30
1.751:45
2.002:00
2.252:15
2.502:30
2.752:45
3.003:00
3.503:30
4.004:00
4.254:15
5.005:00
6.006:00
7.507:30
8.758:45

Real-world examples

  • 1.50 h = 1 h 30 min — Standard lunch break in many U.S. workplaces (90 minutes).
  • 0.25 h = 0 h 15 min — Average coffee break length (15 minutes).
  • 1.75 h = 1 h 45 min — Standard feature film runtime segment (105 minutes).
  • 2.00 h = 2 h 00 min — Typical school exam duration (120 minutes).
  • 3.00 h = 3 h 00 min — FAA requirement for cross-country flight training (180 minutes).
  • 0.50 h = 0 h 30 min — Average TV show slot (30 minutes).
  • 0.75 h = 0 h 45 min — Standard academic class session (45 minutes).
  • 8.00 h = 8 h 00 min — Standard full-time workday (480 minutes).
  • 10.00 h = 10 h 00 min — FMCSA daily driving limit for U.S. bus drivers (600 minutes).
  • 11.00 h = 11 h 00 min — FMCSA daily driving limit for U.S. truck drivers (660 minutes).

What’s your use case, and what other features would you like? Share your ideas in the comments.

CalcuLife.com