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Hours Calculator

Total hours between a start and end time, minus breaks, with pay

Currency

Start Time

Enter a start time

End Time

Enter an end time

Unpaid Break

min

Enter a valid break (0-480)

Hourly Rate

Enter a valid rate

Hours Worked

Decimal Hours

Break Deducted

Estimated Pay

Total Minutes

--0%--

Hours Calculator — Complete Guide

Work time looks simple until you actually have to add it up: a shift that crosses midnight, a lunch break that may or may not be paid, and a payroll system that wants decimal hours while the clock shows hours and minutes. This calculator handles all three in one step.

What this calculator does

Enter a start time and an end time, plus any unpaid break, and the tool returns the hours worked in both clock format and decimal format. Add an hourly rate and it also estimates pay. A shift ending earlier than it starts — a night shift from 22:00 to 06:00 — is automatically treated as crossing midnight.

The arithmetic

worked = (end − start) − unpaid break decimal hours = worked ÷ 60 pay = decimal hours × hourly rate

Everything is computed in minutes first, which avoids the classic mistake of subtracting clock numbers directly (17:30 − 9:00 is not 8.30 hours — it is 8 hours 30 minutes, or 8.50 decimal).

A worked example

Shift from 09:00 to 17:30 with a 30-minute unpaid lunch: gross is 8h 30m, minus 30 minutes gives 8h 00m worked, which is 8.00 decimal hours. At $20 an hour the day pays $160. The same shift without the break deduction would be 8h 30m = 8.50 hours = $170 — the 30 minutes is worth $10, which is why break rules matter.

Start	End	Break	Worked	Decimal
09:00	17:30	30 min	8h 00m	8.00
22:00	06:00	45 min	7h 15m	7.25
08:15	16:45	0 min	8h 30m	8.50

Rounding, breaks and the law

Employers may round time to the nearest 5, 6 or 15 minutes under US federal rules, but rounding must not systematically favour the employer.
Short rest breaks of 5–20 minutes are generally paid time; genuine meal breaks of 30+ minutes can be unpaid. Only deduct the unpaid ones.
Hours beyond 40 in a week trigger overtime at 1.5× in the US — use the Overtime Pay Calculator for that step.
Keep your own record: a running tally of daily hours is the evidence you need if a payslip looks short.

For a week of work, run the calculator once per day and add the decimal hours together before multiplying by the rate — that keeps each day's break handling separate, which is how most timesheet rules expect it.

工时计算器完整使用指南

工时这东西看着简单，真要算清楚并不容易：有跨零点的夜班、可能带薪也可能不带薪的午休，还有一套「考勤按时分、工资按十进制小时」的双轨制。这个计算器把这些一次性处理完。

这个计算器能做什么

输入上班与下班时间，加上无薪休息时长，工具会同时给出「时分格式」和「十进制格式」的工时；再填入时薪，还会给出当日工资预估。下班时间早于上班时间（比如 22:00 到 06:00 的夜班）会被自动识别为跨夜。

计算过程

工时 = (下班 − 上班) − 无薪休息十进制小时 = 工时 ÷ 60 工资 = 十进制小时 × 时薪

所有计算先换算成分钟再进行，这样就不会犯「直接用钟表数字相减」的经典错误——17:30 减 9:00 并不是 8.30 小时，而是 8 小时 30 分，即十进制的 8.50 小时。

算例演示

09:00 到 17:30 的班，午休 30 分钟不计薪：毛工时 8 小时 30 分，扣除 30 分钟后实做 8 小时整，对应十进制 8.00。按 20 元时薪算，当天工资 160 元。如果忘了扣休息，会得到 8.50 小时、170 元——那 30 分钟值 10 元，休息规则是否带薪直接影响钱包。

上班	下班	休息	实做	十进制
09:00	17:30	30 分钟	8 小时 00 分	8.00
22:00	06:00	45 分钟	7 小时 15 分	7.25
08:15	16:45	0 分钟	8 小时 30 分	8.50

舍入、休息与法规

美国联邦规则允许雇主按最近的 5、6 或 15 分钟对工时舍入，但不允许系统性偏向雇主一方。
5–20 分钟的短休一般属于带薪时间；30 分钟以上、完全解除工作义务的用餐时间可以不计薪。只扣除不计薪的那部分。
在美国，周工时超过 40 小时的部分按 1.5 倍付加班费——这一步用加班费计算器接着算。
自己留一份记录：每日工时的流水账，是工资条看起来不对时最有用的凭据。

要算一整周的工时，按天各算一次再把十进制小时相加，最后乘以时薪——每天单独处理休息，才符合大多数考勤规则的计算口径。

Frequently Asked Questions

How do I calculate work hours between two times?

Subtract the start time from the end time, then subtract any unpaid breaks. From 9:00 to 17:30 with a 30-minute lunch: 8h 30m − 0h 30m = 8 hours worked. If the end time is smaller than the start time, the shift crosses midnight and 24 hours are added.

How do I convert minutes to decimal hours for payroll?

Divide the minutes by 60. 8 hours 30 minutes is 8.50 in decimal hours, 8 hours 45 minutes is 8.75. Most payroll systems take decimal hours, which is exactly what this calculator shows.

Should breaks be deducted from hours worked?

It depends on their length and your local rules. In the US, bona fide rest breaks of 5–20 minutes are generally paid, while genuine meal periods of 30 minutes or more where you are fully relieved of duty can be unpaid — deduct only the unpaid ones.

Last reviewed: October 5, 2026 · How we calculate · Sources: US Department of Labor (FLSA), ACAS