Hours to decimal calculator
This hours to decimal calculator converts hours and minutes to decimal hours, and decimal hours back to hours and minutes, the instant you type. Both sides stay in sync, everything runs in your browser, and there is no signup.
Hours to decimal calculator
Have it as h:mm? Type it here and the hours and minutes fill in.
Start here to go the other way: 8.35 comes back as 8 h 21 m.
7 h 45 m=7.75 h
7.7500 to four places, 465 minutes in total
No rounding applied. Pick 6, 15 or 30 minutes to see the raw and rounded value side by side.
7.75 h × $90.00 = $697.50
How to convert hours to decimal (the formula)
To convert time to decimal hours, divide the minutes by 60 and add the whole hours. 8 hours 30 minutes is 8 plus 30 divided by 60, which is 8.5. To go back, keep the whole number as the hours and multiply the decimal part by 60: 6.4 hours is 6 hours and 24 minutes.
decimal hours = hours + (minutes / 60)
example: 7 h 45 m becomes 7 + (45 / 60) = 7.75
minutes = (decimal hours minus whole hours) × 60
example: 8.35 h becomes 0.35 × 60 = 21 min, so 8:21
How to convert hours to decimals?
Divide the minutes by 60 and add the whole hours. 8 hours 30 minutes is 8 plus 30 divided by 60, which is 8.5. If you have seconds too, divide them by 3600 and add that. The result is the whole span written as one decimal number, ready to multiply by a rate.
What is 0.10 of an hour?
0.10 of an hour is 6 minutes, because 0.10 times 60 is 6. This is why professional time is billed in tenths: each 6-minute block is one tenth of an hour. 0.2 is 12 minutes, 0.3 is 18 minutes, and so on up to 1.0 at a full 60 minutes.
What is 2.5 hours in decimal?
2.5 hours is already in decimal form. It means 2 hours and 30 minutes, because 0.5 of an hour is 30 minutes (0.5 times 60). Written on a clock it is 2:30. Written as decimal hours for payroll or an invoice it stays 2.5, and you multiply it by the rate as it is.
What is .65 of an hour?
0.65 of an hour is 39 minutes, because 0.65 times 60 is 39. To go the other way, divide the minutes by 60: 39 divided by 60 is 0.65. So a timesheet entry of 39 minutes is recorded as 0.65 decimal hours, and 0.65 hours reads back as 39 minutes.
Minutes to decimal chart (1 to 60)
Every minute from 1 to 60 as a decimal hour, so the values that come up most on a timesheet are a lookup rather than a sum. Decimal hours equals minutes divided by 60. The last two columns round each minute up to the next 6-minute (0.1 h) and 15-minute (0.25 h) billing increment, the way a legal or consulting bill does.
| Min | Decimal | 6 min | 15 min |
|---|---|---|---|
| 1 | 0.02 | 0.10 | 0.25 |
| 2 | 0.03 | 0.10 | 0.25 |
| 3 | 0.05 | 0.10 | 0.25 |
| 4 | 0.07 | 0.10 | 0.25 |
| 5 | 0.08 | 0.10 | 0.25 |
| 6 | 0.10 | 0.10 | 0.25 |
| 7 | 0.12 | 0.20 | 0.25 |
| 8 | 0.13 | 0.20 | 0.25 |
| 9 | 0.15 | 0.20 | 0.25 |
| 10 | 0.17 | 0.20 | 0.25 |
| 11 | 0.18 | 0.20 | 0.25 |
| 12 | 0.20 | 0.20 | 0.25 |
| 13 | 0.22 | 0.30 | 0.25 |
| 14 | 0.23 | 0.30 | 0.25 |
| 15 | 0.25 | 0.30 | 0.25 |
| 16 | 0.27 | 0.30 | 0.50 |
| 17 | 0.28 | 0.30 | 0.50 |
| 18 | 0.30 | 0.30 | 0.50 |
| 19 | 0.32 | 0.40 | 0.50 |
| 20 | 0.33 | 0.40 | 0.50 |
| 21 | 0.35 | 0.40 | 0.50 |
| 22 | 0.37 | 0.40 | 0.50 |
| 23 | 0.38 | 0.40 | 0.50 |
| 24 | 0.40 | 0.40 | 0.50 |
| 25 | 0.42 | 0.50 | 0.50 |
| 26 | 0.43 | 0.50 | 0.50 |
| 27 | 0.45 | 0.50 | 0.50 |
| 28 | 0.47 | 0.50 | 0.50 |
| 29 | 0.48 | 0.50 | 0.50 |
| 30 | 0.50 | 0.50 | 0.50 |
| Min | Decimal | 6 min | 15 min |
|---|---|---|---|
| 31 | 0.52 | 0.60 | 0.75 |
| 32 | 0.53 | 0.60 | 0.75 |
| 33 | 0.55 | 0.60 | 0.75 |
| 34 | 0.57 | 0.60 | 0.75 |
| 35 | 0.58 | 0.60 | 0.75 |
| 36 | 0.60 | 0.60 | 0.75 |
| 37 | 0.62 | 0.70 | 0.75 |
| 38 | 0.63 | 0.70 | 0.75 |
| 39 | 0.65 | 0.70 | 0.75 |
| 40 | 0.67 | 0.70 | 0.75 |
| 41 | 0.68 | 0.70 | 0.75 |
| 42 | 0.70 | 0.70 | 0.75 |
| 43 | 0.72 | 0.80 | 0.75 |
| 44 | 0.73 | 0.80 | 0.75 |
| 45 | 0.75 | 0.80 | 0.75 |
| 46 | 0.77 | 0.80 | 1.00 |
| 47 | 0.78 | 0.80 | 1.00 |
| 48 | 0.80 | 0.80 | 1.00 |
| 49 | 0.82 | 0.90 | 1.00 |
| 50 | 0.83 | 0.90 | 1.00 |
| 51 | 0.85 | 0.90 | 1.00 |
| 52 | 0.87 | 0.90 | 1.00 |
| 53 | 0.88 | 0.90 | 1.00 |
| 54 | 0.90 | 0.90 | 1.00 |
| 55 | 0.92 | 1.00 | 1.00 |
| 56 | 0.93 | 1.00 | 1.00 |
| 57 | 0.95 | 1.00 | 1.00 |
| 58 | 0.97 | 1.00 | 1.00 |
| 59 | 0.98 | 1.00 | 1.00 |
| 60 | 1.00 | 1.00 | 1.00 |
Quarter hours (15, 30, 45 and 60 minutes) are set in bold, because most rounded entries land on them.
Billing increments: 6-minute and 15-minute rounding
Two conventions cover almost every hourly bill. The 6-minute increment bills in tenths of an hour (0.1 h), so a task rounds up to the next 6-minute block. Lawyers and accountants use it because it keeps a two-minute call from disappearing and keeps every line on the same unit. The 15-minute increment bills in quarter hours (0.25 h) and is the common freelance and agency choice.
Round to the nearest unit unless your contract says otherwise. Always rounding up is a small premium you can charge only if the client agreed to it in writing, and always rounding down is a discount you never meant to give, repeated on every line. Say which increment you use in the agreement, then run the totals through the billable hours calculator to see what the rounding adds across a week, or read how it plays out for lawyers who bill in tenths.
Decimal hours for payroll and invoices
Once your hours are decimal, pay is one multiplication: decimal hours times the rate. 10 hours 45 minutes is 10.75, so at $90 an hour that is 10.75 times 90, or $967.50. A spreadsheet adds a column of decimals cleanly, where a column of h:mm times has to be carried by hand. If what you have is clock-in and clock-out times, the timecard calculator turns a week of them into daily and weekly totals first, then the decimal drops straight into the pay math above.
Track hours without converting anything
You only convert minutes because a timer produced them. BillNotch records the active window as you work, sorts it into client projects, and keeps a running total in decimal hours, so the number that lands on the invoice is the number you worked. No stopwatch, no timesheet arithmetic, no rounding you have to remember.
It also keeps the raw minutes underneath, so you can apply your own increment at invoice time and still show a client how a line was reached. The conversion this page does by hand is the one step it removes for good.
Related tools
- Timecard calculator adds up a week of clock times with breaks and overtime.
- Time duration calculator finds the hours between any two times, overnight included.
- Military time converter converts 24-hour and standard time, both directions.
- Billable hours calculator shows what your billable hours are worth once you have a rate.
- Work hours in a year counts the working hours left in a year after time off.
Cite or embed this calculator
Free to reference or embed on your own site. A link back to this page is all we ask.
Hours to Decimal Calculator, BillNotch, billnotch.com/tools/hours-to-decimalThe reference chart is free to reuse on your own site, with a link back to this page.
Frequently asked questions
- What is 15 minutes in decimal hours?
- 15 minutes is 0.25 decimal hours, because 15 divided by 60 is 0.25. The quarter-hour marks are the ones worth memorizing: 15 minutes is 0.25, 30 minutes is 0.5, and 45 minutes is 0.75. Most 15-minute billing rounds land on exactly these three values.
- What is 45 minutes in decimal hours?
- 45 minutes is 0.75 decimal hours, because 45 divided by 60 is 0.75. It is three quarters of an hour, so 7 hours 45 minutes is 7.75, not 7.45. Writing 7.45 when you mean 7:45 is the most common way an hour gets mispriced on an invoice.
- How do you convert decimal hours back to hours and minutes?
- Keep the whole number as the hours and multiply the decimal part by 60 to get the minutes. For 6.25 hours, 0.25 times 60 is 15, so 6.25 is 6 hours 15 minutes. For 8.35 hours, 0.35 times 60 is 21, giving 8 hours 21 minutes. The decimal-to-time side of the tool does this for you.
- Why do payroll and invoices use decimal hours?
- Decimal hours multiply cleanly by a rate, and clock time does not. You cannot multiply 7:45 by $90 without converting it first, and you cannot add a column of times like 1:20 and 2:50 without carrying minutes by hand. 7.75 times $90 is one multiplication, which is why every payroll run and hourly invoice uses decimals.
- What is a 6-minute billing increment?
- A 6-minute increment bills time in tenths of an hour, because 6 minutes is 0.1 of an hour. Lawyers and accountants log work this way: a task is rounded up to the next tenth, so 4 minutes becomes 0.1 and 7 minutes becomes 0.2. It keeps short entries from vanishing and keeps every line on the same unit.
- Should I round each entry or only the invoice total?
- Round each entry to your billing increment, then add the rounded entries. Rounding only the final total hides how each line was reached, and a client who queries one line cannot see your working. Round per entry, keep the raw minutes underneath, and state the increment in your contract so the rounding is never a surprise.
- Is 7.45 the same as 7 hours 45 minutes?
- No. 7 hours 45 minutes is 7.75 decimal hours, because 45 divided by 60 is 0.75. 7.45 would be 7 hours and 27 minutes, since 0.45 times 60 is 27. Mixing the two is a real billing error: at $90 an hour the gap between 7.45 and 7.75 is $27 on a single entry.
- What is 0.20 of an hour?
- 0.20 of an hour is 12 minutes, because 0.20 times 60 is 12. It is the second six-minute billing block, so time logged in tenths shows 12 minutes as 0.2 hours. That sits just under 0.25 of an hour, which is 15 minutes, one of the quarter-hour marks worth memorizing.
- What is .41 of an hour?
- 0.41 of an hour is about 25 minutes, because 0.41 times 60 is 24.6, which rounds to 25. To turn any decimal back into minutes, multiply the decimal part by 60. So 0.41 hours is 24.6 minutes, just past the 0.4 mark, which is 24 minutes in tenth-of-an-hour billing.
Stop converting by hand
You only convert minutes because a timer produced them. BillNotch records the hours as you work and totals them in decimal on the invoice, so the conversion is already done when it is time to bill.
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