Work Hours Calculator
By Miikka · CalcBrew · Updated
| Hours / week | 40 h |
| Hours / month | 173.2 h |
| Hours / year | 2,080 h |
| Share of full-time(full-time = 40 h/week) | 100 % |
This work hours calculator helps you understand your working time on a weekly, monthly and yearly basis, and to work out part-time pay relative to full-time. It suits both employees and managers who want a quick picture of hours worked and the part-time ratio.
How the calculator works and what it’s for▾
How the work hours calculator works
The calculator derives your total working hours from your weekly working time. Once you know your weekly hours, the monthly and annual totals follow by multiplying weekly hours by the number of working weeks in that period.
The part-time share is found by dividing part-time hours by full-time hours. That percentage can then be applied to a full-time salary to estimate the pay matching part-time hours.
What you enter and what you get
Typically you provide your weekly working time, and where needed a full-time reference and a salary. The results show your hours over different periods and the part-time percentage.
The output makes clear how much working time builds up over the longer term and how a part-time role compares with full-time work in terms of both hours and pay.
Who it is for
The calculator is useful for part-time workers who want to check their pay is correct, and for job seekers comparing the hours and salaries of different roles.
Managers and entrepreneurs can also use it for shift planning and for a rough estimate of labour costs before running detailed payroll.
Good to know
The calculator gives an indicative picture and does not replace official payroll or the working time set by a collective agreement. Holidays, public holidays and overtime can change actual hours.
Always check your contract and any applicable collective agreement, as definitions of working time and ways of calculating monthly hours can vary between sectors.
🔄 Reviewed June 2026
Frequently asked questions
Cite this calculator
CalcBrew. (2026). Work Hours Calculator. https://calcbrew.com/work-hours-calculator“Work Hours Calculator.” CalcBrew, 2026, calcbrew.com/work-hours-calculator.Link to https://calcbrew.com/work-hours-calculator. Results are estimates; cite the underlying formula or data source for academic work.
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