小时转小数计算器

在工资单录入、自由职业计费和考勤表填写中，时间通常需要以小数形式表示。本工具支持HH:MM（时:分）格式与小数小时的双向转换，一键完成，避免手动计算出错。

工具语言：英文 · 支持HH:MM转小数 / 小数转HH:MM两种模式

Convert between HH:MM and decimal hours in one click — essential for payroll systems, invoicing, and timesheet entry.

Payroll entryFreelance invoicingTimesheet conversionOvertime calculationProject billing
Quick conversions: 0.50 hrs = 30 min • 0.75 hrs = 45 min • 1h 15m = 1.25 • 7h 45m = 7.75
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Quick Reference

0:10=0.1667
0:15=0.25
0:20=0.3333
0:30=0.50
0:45=0.75
1:00=1.00
1:15=1.25
1:30=1.50
1:45=1.75
2:00=2.00
3:30=3.50
4:00=4.00
7:00=7.00
7:30=7.50
7:45=7.75
8:00=8.00
8:30=8.50
9:00=9.00

Formula

Decimal Hours = Hours + (Minutes ÷ 60)

Divide the minutes by 60 to get the fractional part, then add the whole hours. For example: 7h 45m = 7 + (45 ÷ 60) = 7.75 decimal hours.

Worked Example

Scenario: A freelancer tracks 3 sessions: 2h 15m, 1h 45m, and 3h 30m. They need to invoice using decimal hours.

2h 15m = 2 + 15/60 = 2.25

1h 45m = 1 + 45/60 = 1.75

3h 30m = 3 + 30/60 = 3.50

Total: 2.25 + 1.75 + 3.50 = 7.50 decimal hours

At £80/hr, invoice amount = 7.50 × £80 = £600.00.

Common Mistakes

  • Entering 45 minutes as 0.45 decimal. Minutes and decimal fractions are different. 45 minutes = 0.75, not 0.45.
  • Adding HH:MM values directly. 7h 45m + 7h 30m ≠ 14h 75m. Always convert to decimal first, add, then convert back if needed.

Guide

How to Use

  1. 1

    Choose the conversion direction

    HH:MM → Decimal converts hours and minutes into a decimal. Decimal → HH:MM reverses it.

  2. 2

    Enter your value

    Type the hours and minutes, or the decimal number you want to convert.

  3. 3

    Click Convert

    The result appears instantly.

  4. 4

    Copy to clipboard

    Use the copy button to paste directly into payroll software or an invoice.

Next Steps

What to do next

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FAQ

Frequently Asked Questions

Browse all calculators on UtilityPilot

转换公式

HH:MM → 小数：小数小时 = 小时数 + 分钟数 ÷ 60

小数 → HH:MM：小时 = 整数部分，分钟 = 小数部分 × 60

示例：7小时45分 = 7 + 45÷60 = 7.75小时
示例：3.5小时 = 3小时 + 0.5×60分 = 3小时30分

业务示例

场景：自由设计师本周完成3个项目，工时记录为2h 15m、1h 45m、3h 30m，需按小数小时开具发票。

2h 15m = 2 + 15÷60 = 2.25

1h 45m = 1 + 45÷60 = 1.75

3h 30m = 3 + 30÷60 = 3.50

合计：2.25 + 1.75 + 3.50 = 7.50小时

按800元/小时计算，发票金额 = 7.50 × 800 = 6,000元。

常用转换速查表

0:15=0.25
0:30=0.50
0:45=0.75
1:00=1.00
1:15=1.25
1:30=1.50
1:45=1.75
2:00=2.00
3:30=3.50
7:00=7.00
7:30=7.50
7:45=7.75
8:00=8.00
8:30=8.50
9:00=9.00

常见问题

0.5小时等于多少分钟？

0.5小时 = 0.5 × 60 = 30分钟，即半小时。

0.75小时等于多少分钟？

0.75小时 = 0.75 × 60 = 45分钟，即四分之三小时。

1小时15分换算成小数是多少？

1h 15m = 1 + 15÷60 = 1.25小时。

为什么工资单使用小数小时？

小数小时便于乘以小时工资率进行计算。例如，7.5 × 150元比7小时30分 × 150元更直观，且大多数工资和财务软件直接接受小数输入。

小数应保留几位？

用于工资单和发票时，通常保留两位小数。工具默认显示四位小数以保证精度，录入工资系统前可四舍五入到两位。

免责声明

计算结果仅供参考。将结果录入工资系统或发票前，请根据贵方工资制度要求进行核验。

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