Hours and Minutes Calculator

About the Hrs & Mins Calculator

Payroll systems, spreadsheets, and time-tracking software often need decimal hours (like 2.75), while people naturally think in hours and minutes (like 2 hours 45 minutes) — this calculator converts cleanly between the two formats in either direction.

How It Works

Converting to decimal, the calculator divides the minutes by 60 and adds that fraction to the whole hours. Converting from decimal, it takes the whole-number part as hours and multiplies the remaining fraction by 60 to get the minutes, rounding to the nearest whole minute.

Decimal Hours = Hours + Minutes/60. Hours & Minutes = floor(Decimal), round((Decimal − floor(Decimal)) × 60) minutes.

Worked example

Scenario: Converting 2 hours 45 minutes to decimal hours, and 2.75 hours back again.

1. Minutes to hours: 45 ÷ 60 = 0.75.
2. Decimal hours: 2 + 0.75 = 2.75.
3. Back again: 0.75 × 60 = 45 minutes, so 2.75 h = 2h 45m.

Result: 2 hours 45 minutes = 2.75 decimal hours (165 minutes).

Tips and common mistakes

• Common conversions: 15 min = 0.25 h, 20 min ≈ 0.333 h, 30 min = 0.5 h, 45 min = 0.75 h.
• Timesheets that allow two decimals round 20 minutes to 0.33 h; check your employer's rounding rule.
• Enter minutes from 0 to 59 in the Minutes field; carry larger values into Hours.

Assumptions & Limitations

• Assumes minutes are entered as a value between 0 and 59 when converting to decimal.
• Rounds minutes to the nearest whole minute when converting from decimal hours.

• Very small rounding differences can appear when converting back and forth repeatedly due to standard floating-point rounding.

Frequently Asked Questions