Hours Calculator

Decimal hours · Timesheet sum · Shift · Pay estimate

Convert direction

Hours

Minutes

Quick examples

📌

Decimal hours = hours + minutes÷60. Sum minutes first, then convert once for payroll totals.

⏰ Enter hours to convert, sum, or price.

Hours and Decimal Formulas

Payroll software stores time as decimal hours. Converting HH:MM correctly prevents pay errors of several dollars per week.

Hours and minutes to decimal

Decimal = Hours + Minutes ÷ 60 Example: 7h 45m → 7 + 45/60 = 7.75 Example: 8h 06m → 8 + 6/60 = 8.10

Decimal to hours and minutes

Hours = floor(Decimal) · Minutes = round((Decimal − Hours) × 60) Example: 8.25 → 8h + 0.25×60 = 15m

Shift hours

Worked = End − Start − Break If overnight: End += 24h before subtracting Example: 09:00–17:30 − 30m = 8h 00m = 8.00

💡

Sum all days in minutes, then convert the weekly total once. That matches common payroll practice.

Modes & FAQ

Mode	Best for
Decimal	HH:MM ↔ payroll decimal
Add Hours	Weekly timesheet totals
Shift	One day punches + break
Pay	Hours × rate (+ OT)

How do you convert hours and minutes to decimal hours?

Divide minutes by 60 and add to whole hours. 45 minutes is always 0.75 hours.

What is 15 minutes in decimal hours?

15 ÷ 60 = 0.25 decimal hours. The cheat sheet in results lists other common minute values.

How to Use This Hours Calculator

Use Decimal to convert a single duration. Use Add Hours to total several day rows for a week. Use Shift for one clock in and clock out with an unpaid break. Use Pay to estimate gross pay from hours and an hourly rate, with optional overtime hours.

Results always show HH:MM, decimal hours, and total minutes together so you can match both timesheet paper forms and payroll software exports in one view.

What decimal hours are

Decimal hours express time as a single number where the fraction is a portion of an hour. 0.50 means thirty minutes. Payroll computers multiply decimal hours by wage rates. They do not multiply HH:MM strings directly.

How to convert manually

1. Write hours and leftover minutes. 2. Compute minutes÷60. 3. Add to hours. Reverse: separate the integer hours, multiply the fraction by 60, and round minutes as your policy requires.

Timesheet totaling

Enter each day as hours and minutes. The calculator converts each row to minutes, sums, then reports one HH:MM total and one decimal total. Converting each day to a rounded decimal and then adding can disagree by a few hundredths. Prefer the minute sum method.

Shift with break

Gross span is end minus start. Net worked time removes unpaid break minutes. Overnight shifts that end after midnight need the overnight option so 22:00 to 06:00 becomes eight hours before the break.

Rounding policies

Some employers round punches to the nearest 5, 6, or 15 minutes under workplace timekeeping rules. This tool shows exact minutes plus quarter hour (0.25) and tenth hour (0.10) rounded displays so you can compare. Confirm the rounding rule your employer uses.

Overtime note

In the United States, the Fair Labor Standards Act generally requires overtime pay of at least one and one half times the regular rate for covered nonexempt employees for hours over 40 in a workweek. Daily OT thresholds in the Shift mode are optional helpers and may not match your jurisdiction.

Common mistakes

Treating 7.45 as 7 hours 45 minutes (that would be 7.75)
Adding rounded daily decimals instead of minute totals
Forgetting unpaid breaks
Ignoring overnight on night shifts
Using clock hours without converting before multiplying pay

Practical scenarios

Freelancers convert tracked HH:MM into invoice decimals. Managers sum team timesheets. Students log study blocks. Payroll clerks check a punch card against decimal exports.

Use the Time Calculator for general duration math across days and seconds. Use this Hours Calculator when the output must be payroll style decimal hours.

Why 7.45 is not 7 hours 45 minutes

People sometimes type 7.45 meaning seven hours and forty five minutes. In decimal hours 7.45 means 7 hours plus 0.45 × 60 = 27 minutes. Forty five minutes is always 0.75 of an hour, so the correct decimal is 7.75. The cheat sheet in the results panel lists the common minute fractions.

Quarter hour and tenth hour displays

Nearest quarter hour rounds to .00, .25, .50, or .75. Nearest tenth hour rounds to steps of 0.10. Exact minutes remain the source of truth. Use rounded views only when your workplace policy says to.

Billable hours for freelancers

Track each client block as HH:MM, convert to decimal, then multiply by your rate in Pay mode. If you bill in 15 minute increments, compare the exact total with the quarter hour rounded value before you send the invoice.

Night shift example

Clock in 22:00, clock out 06:30, unpaid break 30 minutes. Gross span is 8 hours 30 minutes. Net is 8 hours 00 minutes, which is 8.00 decimal hours. Without overnight handling the calculator would see end before start and report a wrong negative span.

When this calculator is useful

Use it to convert hours and minutes, total a week of entries, compute one shift net of break, estimate gross pay, and check common minute to decimal pairs.

Pay estimate

Gross pay here is regular hours × rate plus overtime hours × rate × multiplier. It ignores taxes, differentials, and premiums. Treat it as a planning estimate only.

Multiple breaks

If you took more than one unpaid break, add the break minutes together before entering the Shift break field. Example: 15 minutes morning and 30 minutes lunch is a 45 minute unpaid total.

Comparing with the Time Calculator

The Time Calculator handles general duration math including seconds and multi day clocks. This Hours Calculator focuses on payroll style outputs: decimal hours, timesheet sums, shift net time, and a simple pay estimate. Use both when a problem spans both needs.

When this calculator may not be enough

It does not store employee records, apply union contracts, or compute tax withholdings. Complex schedules with paid breaks, premiums, or multiple rates need your payroll system.

How to interpret your result

The hero emphasizes the primary form for the active mode (decimal, HH:MM total, or pay). Chips always mirror HH:MM, decimal, and minutes. Regular and OT splits appear when a threshold or OT hours field applies.

Worked payroll example

Week total 41:15. Decimal = 41 + 15/60 = 41.25. At $18/hour with 1.25 OT hours above 40: regular pay 40×18 = $720, OT pay 1.25×18×1.5 = $33.75, gross $753.75 before tax.

Hourly to weekly estimate

If you know only your hourly rate and a planned week length, enter 40 hours 0 minutes in Pay mode with OT hours left at zero for a straight time weekly estimate. Add overtime hours separately when the week runs long.

Limitations

Calculations use exact minute arithmetic without leap seconds. Pay figures are educational estimates. Overtime rules vary by law and contract.

⚠️

Not legal or payroll advice. Confirm hours and pay with your employer or payroll provider.

ℹ️

US overtime context references the Fair Labor Standards Act overtime framework published by the U.S. Department of Labor.

How do you convert decimal hours to hours and minutes?

Keep the whole hours. Multiply the fractional part by 60 for minutes. 8.25 becomes 8 hours 15 minutes.

How do you add hours on a timesheet?

Add each day’s hours and minutes as total minutes, then convert the sum once to HH:MM and decimal hours in the Add Hours mode.

How do you calculate hours worked from start and end time?

Subtract start from end in minutes, add 24 hours if overnight, subtract unpaid break, then convert to HH:MM and decimal.

Should I round each day before adding?

Usually no. Sum exact minutes for the pay period, then convert. Rounding daily decimals first can drift from the true total.

Sources & References

U.S. Department of Labor: Fair Labor Standards Act (overtime overview): dol.gov/agencies/whd/flsa
NIST SI Units — Time (second as base unit): nist.gov/pml/owm/si-units-time