Hour Calculator
Add, subtract, and convert hours with this free calculator. Perform operations in hours:minutes or centesimal format, and instantly get the result in both formats — ideal for payroll and timesheets.
Choose an operation and enter your durations to calculate the result.
Hour calculator: add, subtract and convert
Our hour calculator allows you to perform arithmetic operations on durations expressed in hours and minutes. Whether you need to add your working hours over multiple days or convert a time to centesimal format for your payslip, this tool is designed for you.
Adding and subtracting hours
Adding hours may seem simple, but it requires correctly handling the transition from minutes to hours. For example, 2h45 + 3h30 does not give 5h75, but rather 6h15. Our calculator automatically handles these conversions for you, without any risk of error.
Conversion between different formats
The centesimal format (or decimal) is widely used in payroll and human resources. Instead of expressing time in hours and minutes, hundredths of an hour are used: 7h30 becomes 7.50.
Business use
This calculator is particularly useful for payroll managers, HR managers and employees who want to verify their hours. It allows quick conversion of time records to decimal values for salary calculation.
Frequently Asked Questions
Related tools
Work Hours Calculator
Calculate your daily and weekly working hours with break management and overtime.
CalculateTime Calculator
Calculate the duration between two times or add durations easily.
CalculateMauricette Calculator
The modern alternative to Calculette Mauricette for calculating your working hours.
CalculateHow to use the hour calculator
- 1
Choose your operation
Select the "Add/Subtract" or "Conversion" tab as needed.
- 2
Enter your values
Enter hours in HH:MM format or centesimal depending on the selected mode.
- 3
Click Calculate
The result is displayed immediately in h:min, centesimal and total minutes.