Time to Decimal Calculator

Our time to decimal calculator converts HH:MM:SS into decimal hours, minutes and seconds — and converts decimal hours back into clock time. Built for timesheets, payroll, hourly billing and project time tracking, it replaces error-prone manual base-60 math with one click.

Quick Answer — the most common conversion

7:45 = 7.75 decimal hours

7 hours+45 minutes→→45 ÷ 60 = 0.75→→7 + 0.75 = 7.75 decimal hours

Hours

Minutes

Seconds

Decimal places

Payroll typically uses 2; engineering and science often use 4.

Quick values

Click a value to fill the fields above — 1:30 becomes 1.50 decimal hours.

Enter hours, minutes and seconds to see the decimal equivalent.

Time to Decimal Calculator — Guide

Convert time to decimal (timesheet & payroll)

Pick the Time to Decimal tab
Enter hours, minutes and seconds (hours can exceed 24 — e.g. 40:00:00 for a work week)
Choose 2, 3 or 4 decimal places and read the result — or click a quick value

Convert decimal back to clock time

Switch to the Decimal to Time tab
Enter a decimal value such as 8.75 (8.75 hours = 8:45:00)
The result updates instantly as you type

The formula is simple: Decimal hours = Hours + Minutes ÷ 60 + Seconds ÷ 3,600. Minutes follow base-60 — 1 hour 30 minutes = 1.50 hours, never 1.30. Everything runs locally in your browser — your timesheet data never leaves your device.

How to Use

1. Enter the time

Type hours, minutes and seconds in the Time to Decimal tab — hours can exceed 24 for weekly totals like 40:00:00.

2. Pick a precision

Choose 2, 3 or 4 decimal places (payroll typically uses 2), or click a quick value like 7:30 to fill the fields instantly.

3. Read the result

See Decimal Hours / Minutes / Seconds together, or switch to the Decimal to Time tab to convert back to HH:MM:SS. Everything runs entirely in your browser — no data leaves your device.

How to Convert Time to Decimal — Step by Step

Take 2:45:45. Break each unit into hours (60 minutes per hour, 3,600 seconds per hour):

Decimal hours: 2 + 45/60 + 45/3600 = 2 + 0.75 + 0.0125 = 2.7625 hours
Decimal minutes: 120 + 45 + 45/60 = 165.75 minutes
Decimal seconds: 7,200 + 2,700 + 45 = 9,945 seconds

Worked Examples

Example	Calculation	Result
Standard 8-hour shift	8 + 30/60	8.5 h
Half day + 15 min overtime	7 + 45/60	7.75 h
Odd 36 minutes	36/60	0.60 h
Second-level precision	6 + 15/60 + 30/3600	6.26 h (2 dp)
Reverse: 2.7625 → clock time	× 3,600 = 9,945 s → split	2:45:45
Teaching example	3 + 45/60	3.75 h

⚠️ 8:45 is not 8.45

8 hours 45 minutes = 8.75 decimal hours. Reading it as 8.45 gives 8.45 hours = 8 hours 27 minutes — 18 minutes less per entry. Likewise 7:30 = 7.50, never 7.30. Always convert with a calculator, not by eye.

Real-World Examples

Standard 8-hour shift + 1h lunch

9:00–18:00 with an unpaid 1-hour lunch = 8 h worked

8.00 h × $20/hr = $160.00

Freelance client work

Tracked 3h 15m on a client task

3.25 h × $60/hr = $195.00

Project tracking

Website redesign session of 1:24:09

1.4025 h

Time to Decimal Conversion Chart

Minutes to decimal hours for the full 1–60 range (2 decimal places, NC DOL timesheet standard). Print this page for a wall chart — payroll conversion charts save a payroll clerk hours every week.

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

Common Timesheet Values

15 min = 0.2530 min = 0.5045 min = 0.751 h = 1.001 h 30 min = 1.502 h = 2.00

Common Timesheet Scenarios

Shift	Decimal Hours	× $20/hr
9:00 – 17:00 (8 h)	8.00	$160.00
8:30 – 17:00 (8 h 30 min)	8.50	$170.00
9:00 – 17:30 (8 h 30 min)	8.50	$170.00
7:45 – 16:30 (8 h 45 min)	8.75	$175.00
9:00 – 18:00 (8 h worked + 1 h lunch)	8.00	$160.00
40-hour standard week	40.00	$800.00

Working out a timesheet? Total your daily clock-in/out hours with the Work Hours Calculator — it adds up a full week with breaks and shows decimal hours automatically.

How to Convert Decimal Hours Back to Clock Time

Multiply the decimal hours by 3,600 to get total seconds, then split into hours, minutes and seconds. Examples:

8.75 → 8.75 × 3,600 = 31,500 s → 8:45:00
0.25 → 0.25 × 3,600 = 900 s → 0:15:00
2.7625 → 2.7625 × 3,600 = 9,945 s → 2:45:45 (round-trip of the example above)

Use this when a payroll system stores decimal hours but your timesheet needs the original clock times — or to double-check a converted timesheet entry.

What Is Decimal Time?

Everyday time is base-60: 60 minutes per hour, 60 seconds per minute. Decimal time converts the same duration to hundredths of an hour (a base-100 scale), so 45 minutes becomes 0.75 — exactly like a calculator handles money. Converting time to hundredths makes payroll math trivial: 8.75 hours × $25.00 = $218.75, with no base-60 carry errors.

Some teams call this “time to 100” — converting the base-60 clock onto a base-100 scale so every hour is exactly 1.00, every minute block is a hundredth, and payroll math becomes straight multiplication.

Who Uses It?

HR & payroll teams

Timesheets arrive as 7:45; payroll systems bill as 7.75. Conversion errors cost real money — a single 18-minute mistake repeats every week.

Freelancers

Hourly billing in decimal hours: 3h 15m becomes 3.25 hours, multiplied straight by the rate.

Project managers

Track task durations in decimal hours for capacity planning and client reports.

Students & teachers

The base-60 vs base-100 math concept appears in time, angles and navigation — this calculator makes it tangible.

Fitness & sports timing

A 47:30 training block is 47.50 minutes, or 0.79 hours — handy for weekly volume totals.

Convert Time to Decimal in Excel

=A1*24 // A1 holds a time like 7:45 → 7.75 decimal hours

=B1+(C1/60) // B1 = hours, C1 = minutes → decimal hours

FLSA Rounding for Payroll

US FLSA rules allow rounding to the nearest quarter hour: round down under 7 minutes and up at 8 minutes or more — 7:53 rounds to 8:00, 7:52 rounds to 7:45. Convert to decimal hours after rounding, not before.

Tips for Accurate Payroll

Round consistently — use one rounding rule for the whole company, never a mix.
Round at the end — convert first, round the final amount; never round intermediate values.
Deduct unpaid breaks — subtract lunch and breaks before converting to decimal.
Handle midnight crossovers — a 22:00–06:00 shift crosses midnight; total the hours correctly first.
Keep records — retain raw clock-in/out times; converted decimals are for estimation.

Time to Decimal Calculator — FAQ

How to convert time to decimal?

Add the hours, then divide the minutes by 60 and the seconds by 3,600: Decimal hours = Hours + Minutes ÷ 60 + Seconds ÷ 3,600. For example, 2:45:45 = 2 + 45/60 + 45/3600 = 2 + 0.75 + 0.0125 = 2.7625 decimal hours. The same input is 165.75 decimal minutes and 9,945 decimal seconds.

What is 5 minutes in decimal?

5 minutes is 0.08 decimal hours (5 ÷ 60 = 1/12 of an hour). A quarter-hour of 15 minutes is 0.25, so 5 minutes is one third of that quarter hour.

What is 10 minutes in decimal?

10 minutes is 0.17 decimal hours (10 ÷ 60 = 1/6 of an hour, rounded to 2 decimal places). The exact value is 0.1666… hours. Ten-minute increments are common in time clock rounding: 10, 20 and 30 minutes round to 0.17, 0.33 and 0.50 decimal hours.

What is 40 minutes in decimal?

40 minutes is 0.67 decimal hours — two thirds of an hour (40 ÷ 60 = 2/3), rounded to 2 decimal places. The exact value is 0.6666… hours. See the 1–60 minute conversion chart above for every value.

What is 15 minutes in decimal?

15 minutes is 0.25 decimal hours — one quarter of an hour (15 ÷ 60 = 1/4). It is the most common timesheet conversion: a 7:45 shift is 7.75 decimal hours.

What is 20 minutes in decimal?

20 minutes is 0.33 decimal hours — one third of an hour (20 ÷ 60 = 1/3), rounded to 2 decimal places. The exact value is 0.3333… hours.

What is 30 minutes in decimal?

30 minutes is 0.50 decimal hours — exactly half an hour (30 ÷ 60 = 1/2). A 1:30 timesheet entry converts to 1.50 decimal hours, never 1.30.

What is 45 minutes in decimal?

45 minutes is 0.75 decimal hours — three quarters of an hour (45 ÷ 60 = 3/4). An 8-hour shift plus 45 minutes is 8.75 decimal hours.

What is 100 minutes in hours?

100 minutes is 1.67 hours — that is 1 hour and 40 minutes (100 ÷ 60 = 1.667). This conversion chart covers 1–60 minutes; for spans over an hour, add the whole hours first, then convert the remaining minutes.

How do I convert decimal hours to hours and minutes?

Multiply the decimal hours by 3,600 to get total seconds, then split into hours, minutes and seconds: 8.75 hours × 3,600 = 31,500 seconds = 8 hours 45 minutes 0 seconds (8:45:00). For minutes only, multiply by 60: 0.88 hours × 60 = 52.8 minutes = 52 minutes 48 seconds.

How many minutes is 0.88 hours?

0.88 hours is 52.8 minutes — that is 52 minutes and 48 seconds (0.88 × 60 = 52.8, and 0.8 × 60 = 48 seconds). Similarly, 0.44 hours = 26.4 minutes = 26 minutes 24 seconds, shown as 0:26:24 by this calculator.

Is 8.45 the same as 8 hours and 45 minutes?

No — 8.45 decimal hours is 8 hours and 27 minutes, which is 18 minutes less than 8 hours 45 minutes (8:45). In decimal time the minutes are hundredths of an hour, not base-60 minutes: 8:45 = 8 + 45/60 = 8.75, never 8.45. This is the most common payroll error.

How to convert time to decimal in Excel?

If A1 contains a time such as 7:45, use =A1*24 to get decimal hours (7.75) — Excel stores times as fractions of a day, so multiplying by 24 converts to hours. For hours in B1 and minutes in C1, use =B1+(C1/60). Format the cell as a number with 2 decimal places.

Is this time to decimal calculator free?

Yes, completely free — no sign-up, no limits. All calculations run locally in your browser and no timesheet data is uploaded anywhere. It works offline once loaded and supports 2, 3 or 4 decimal places for payroll or engineering precision.

Disclaimer

For planning and estimation only — verify payroll records with your employer or payroll software.All calculations run locally in your browser; no data is uploaded.