Minutes to decimal: decimal time converter and chart

What the converter does

• Minutes to decimal: 45 becomes 0.75, 1:45 becomes 1.75, 2h 20m becomes 2.33.
• Decimal back to time: 0.33 hours is 20 minutes, 7.5 hours is 7:30.
• A whole list at once: paste a column of times from a timesheet and copy the decimal column back.
• Rounding the way your payroll or invoices need it: two decimals, tenths (6-minute units) or quarter hours.
• The full chart for 1 to 60 minutes, to print or download as a CSV file.
• Your numbers stay in the page address, so a conversion can be bookmarked or linked. Nothing is sent anywhere.

The formula

Decimal hours = minutes ÷ 60. For hours and minutes it is hours + minutes ÷ 60, so 7:20 = 7 + 20 ÷ 60 = 7.33.

Going the other way, multiply the part after the decimal point by 60: 0.33 × 60 is about 20 minutes, and 7.75 hours is 7 hours and 0.75 × 60 = 45 minutes.

Common conversions

• 15 minutes = 0.25
• 30 minutes = 0.50
• 45 minutes = 0.75
• 20 minutes = 0.33
• 40 minutes = 0.67
• 50 minutes = 0.83

Rounding

Two decimals are standard: 20 minutes is 0.33 and 40 minutes is 0.67, so three 20-minute entries add up to 0.99, not 1.00. Add the minutes first and convert the total if that matters.

Lawyers and consultants often bill in tenths of an hour, where every 6 minutes is 0.1. Some payroll systems round to the nearest quarter hour. Check your policy before rounding, and round the same way every time.

Decimal time is not minutes

The most common mistake is reading 1.30 as one hour thirty minutes. 1.30 decimal hours is 1 hour 18 minutes; one hour thirty minutes is 1.50. If a number has a colon it is hours and minutes, and if it has a decimal point it is a fraction of an hour.