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Convert time to decimal: minutes to decimal hours and back

Clocks count in minutes, payroll and invoices in decimal hours. This hours to decimal calculator works both ways: type a time and get decimal hours, or type decimal hours and get the time, with the working shown so you can check it.

  • Both directions: 7:45 → 7.75 and 7.75 → 7:45.
  • A table from 1 to 60 minutes to print or to look up.
  • Calculated in your browser; nothing is sent.

Hours and minutes → decimal hours

Decimal hours
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Decimal hours → hours and minutes

Hours and minutes
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Minutes to decimal hours: the table

Every minute of an hour as a decimal fraction, rounded to two places. Only multiples of three minutes come out exact — 3 minutes is 0.05 hours.

Minutes Decimal hours
1 0.02
2 0.03
3 0.05
4 0.07
5 0.08
6 0.10
7 0.12
8 0.13
9 0.15
10 0.17
11 0.18
12 0.20
13 0.22
14 0.23
15 0.25
Minutes Decimal hours
16 0.27
17 0.28
18 0.30
19 0.32
20 0.33
21 0.35
22 0.37
23 0.38
24 0.40
25 0.42
26 0.43
27 0.45
28 0.47
29 0.48
30 0.50
Minutes Decimal hours
31 0.52
32 0.53
33 0.55
34 0.57
35 0.58
36 0.60
37 0.62
38 0.63
39 0.65
40 0.67
41 0.68
42 0.70
43 0.72
44 0.73
45 0.75
Minutes Decimal hours
46 0.77
47 0.78
48 0.80
49 0.82
50 0.83
51 0.85
52 0.87
53 0.88
54 0.90
55 0.92
56 0.93
57 0.95
58 0.97
59 0.98
60 1.00

Decimal hours to minutes

The other way round in steps of 0.05 hours: the fractions that turn up on payslips and invoices.

Decimal hours Minutes
0.05 3
0.10 6
0.15 9
0.20 12
0.25 15
0.30 18
0.35 21
0.40 24
0.45 27
0.50 30
Decimal hours Minutes
0.55 33
0.60 36
0.65 39
0.70 42
0.75 45
0.80 48
0.85 51
0.90 54
0.95 57
1.00 60

How the conversion works

An hour has 60 minutes, so a minute is 1/60 of an hour. Divide the minutes by 60 and add them to the whole hours: 7 hours 45 minutes is 7 + 45 ÷ 60 = 7.75 hours.

Backwards, multiply the fraction by 60: 0.75 hours × 60 = 45 minutes. 8.2 hours is therefore 8 hours 12 minutes, not 8 hours 20.

The most common mistake is reading the decimal as minutes: 7.30 hours is 7 hours 18 minutes, and 7 hours 30 minutes is 7.50 hours. On a payslip the difference is 12 minutes per day.

When several times are added up, add the minutes first and convert the total once. Three times 20 minutes printed as 0.33 each add up to 0.99, although they make exactly one hour.

With two decimal places you count in hundredths of an hour: 0.01 hours is 0.6 minutes, or 36 seconds.

Questions about decimal hours

15 minutes is 0.25 hours, 30 minutes is 0.50 hours and 45 minutes is 0.75 hours. Every other minute is in the table above.

Multiply the part after the decimal point by 60: 0.4 hours × 60 = 24 minutes, so 6.4 hours is 6 hours 24 minutes.

Because payroll multiplies hours by a rate, and that only works with a decimal number. 7.50 decimal hours and 7:30 on the clock are the same length of time.

Two places are the usual choice and are accurate to within half a minute. Round only once, on the total — rounding every entry and then adding can be a hundredth off.

No. The converter runs in your browser; nothing is sent to a server and nothing is kept.

Where it goes next

Timesheet template A whole week or month: start, end and break per day, totals in h:mm and decimal hours, ready to print. Invoice template Bill the hours: decimal hours times your rate, with the mandatory details checked as you type.