What this converter does
Timesheets and timers give you hours and minutes. Payroll, invoicing and spreadsheet formulas want one decimal number. This tool bridges that gap: type hours, minutes, and — if you need the precision — seconds, and it returns the equivalent in decimal hours, plus the same duration as total minutes and total seconds. Every field recalculates as you type, so there's no button to press.
It's the single-purpose version of the conversion step buried inside the hours calculator — useful when you already know a duration (from a timer, a paper timesheet, or someone telling you "six hours forty") and just want the decimal, without also working out a start and end time.
How to use it
Three fields, and most people only ever touch the first two.
- Enter the hours.The whole-hours part of the duration — 7 for "7 hours 15 minutes".
- Enter the minutes.The minutes part. If you type 60 or more, it rolls up into extra hours automatically.
- Add seconds if it matters.Optional — leave it at 0 unless you need second-level precision.
- Read and reuse the result.Copy it to a message, print it for a paper record, or download it as a CSV row.
How decimal hours are calculated
The formula has three parts, one for each unit, all added together as a fraction of an hour: decimal hours = hours + (minutes ÷ 60) + (seconds ÷ 3600). The tool actually totals everything into seconds first and divides once, which avoids rounding errors when all three fields are filled in.
28,800 seconds30 minutes →
1,800 secondsTotal = 28,800 + 1,800 = 30,600 seconds
30,600 ÷ 3,600 = 8.50 decimal hours
Minutes of 60 or more
If you type 90 in the minutes field, the tool doesn't reject it — 90 minutes is simply 1.5 hours, so 2 hours 90 minutes converts the same as 3 hours 30 minutes: 3.50 decimal hours. The seconds-based total handles the rollover for you.
Decimal hours vs. hours and minutes
People think in hours and minutes, but decimal hours are what a spreadsheet or payroll system actually multiplies against a rate. 7 hours 15 minutes is 7.25, not 7.15 — a mistake that's easy to make typing figures into an invoice by hand. Going the other direction? Decimal to time converts a decimal figure back into hours and minutes.
Quick examples
Common durations and their decimal equivalents.
| Hours | Minutes | Seconds | Decimal hours |
|---|---|---|---|
| 8 | 30 | 0 | 8.50 |
| 7 | 15 | 0 | 7.25 |
| 0 | 90 | 0 | 1.50 |
| 1 | 45 | 30 | 1.76 |
| 0 | 6 | 0 | 0.10 |
Working from a clock-in and clock-out instead of an already-known duration? The hours calculator finds the gap between two times and gives you the decimal in one step.
Who uses it, and for what
- Freelancers & contractors turning a tracked session (e.g. "6h 40m" from a timer app) into a billable decimal figure for an invoice.
- Payroll & HR staff converting handwritten timesheet entries into decimal hours for spreadsheet or payroll-software import.
- Bookkeepers reconciling hours and minutes reported by staff against decimal totals expected by accounting software.
- Anyone doing quick unit math — converting a duration from a video, workout, or meeting into a comparable decimal number.
Need to convert a large batch of minutes instead of typing hours and minutes separately? The minutes to hours converter is built for minute-only input. For a full week of shifts, use the time card calculator.
Frequently asked questions
How do I convert hours and minutes to decimal hours?
Divide the minutes by 60 and add that to the whole hours. For example, 7 hours 15 minutes is 7 + (15 ÷ 60) = 7.25 decimal hours. This tool does the division for you and rounds to two decimal places.
Why do payroll and invoicing systems use decimal hours?
Payroll and invoicing software multiply a rate by a single number, and decimal hours give them that number directly. 8 hours 30 minutes becomes 8.50, which can be multiplied by an hourly rate without any extra conversion step.
How do I convert just minutes to decimal hours?
Leave the hours field at 0 and enter the minutes on their own — 90 minutes converts to 1.50 decimal hours. For minute-only conversions in bulk, the minutes to hours converter is built specifically for that.
What is the formula behind decimal hours?
Decimal hours = hours + (minutes ÷ 60) + (seconds ÷ 3600). The tool totals everything into seconds first, then divides by 3,600, so mixed units are always handled correctly.
Does this handle seconds?
Yes — the seconds field is optional and adds fine precision for short or exact durations, such as lab timings or media lengths. Leave it at 0 if you only need hours and minutes.
How is this different from the hours calculator?
The hours calculator finds the duration between a start time and an end time. This tool skips that step — you already know the duration and just want it expressed as a decimal, which is useful when you already have hours and minutes from a timesheet or timer.
Is the time to decimal converter free and private?
It is completely free with no sign-up. The calculation runs entirely in your browser — nothing you type is uploaded or stored on a server.
Accuracy & sources
Results come from standard unit arithmetic: hours, minutes and seconds are totaled into seconds, then divided by 3,600 to get decimal hours — exactly as shown in how decimal hours are calculated. There is no proprietary formula or rounding shortcut, and every worked example on this page has been independently verified by hand.
The hour-minute-second relationship follows the SI definitions of time maintained by NIST, and decimal hours follow the standard minutes ÷ 60 convention used by payroll systems. Written and reviewed by Fletcher Langley, and re-checked whenever the tool changes — last reviewed August 2026.
About the author
Operations and workforce-systems specialist with 14+ years inside shift-based industries and payroll platforms, and a BS in Industrial Engineering. Fletcher writes and reviews the calculators, converters, and guides here — from overnight-shift math to decimal payroll hours — drawing on years spent translating between 12-hour, 24-hour, and military time for real timesheets.
Written & reviewed by Fletcher Langley · Last updated: August 2026