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Convert a part-time percentage to hours (and hours to a percentage)

Convert 80%, 90% or any part-time rate into weekly, monthly and annual hours using the French 35 h, 151.67 h and 1,607 h references, or work out the percentage of a weekly schedule.

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Defaults follow the French statutory working time: 35 h a week and 1,607 h a year. If your agreement sets a shorter full-time week (32 h, 33 h…), enter it: that duration becomes the reference.

Working-time percentage

Hours per week
Hours per month (averaged)
Hours per year
Share of full time

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How does this tool work?

Part-time work is often described as a percentage (“an 80% contract”), while the contract must state hours and payroll works in monthly hours. This calculator links these forms in both directions: it converts a percentage into hours per week, month and year, or finds the percentage represented by a weekly schedule. The defaults apply French employment law, where part-time is measured against the statutory 35 hours a week, i.e. 151.67 hours a month and 1,607 hours a year, or against a shorter full-time duration set by a collective agreement. Change both references to use another country’s or employer’s full-time week.

In “percentage → hours” mode, weekly hours equal the full-time week multiplied by the percentage: 35 h × 80% = 28 h. In “hours → percentage” mode, the schedule is divided by the full-time week: 24 ÷ 35 = 68.57%. Monthly hours use payroll averaging: 52 weeks spread over 12 months, i.e. weekly hours × 52 ÷ 12 (35 h gives 151.67 h, 28 h gives 121.33 h). Annual hours apply the percentage to the full-time year, 1,607 h by default in France (1,600 h plus 7 h for the “solidarity day”): 1,607 × 80% = 1,285.6 h. Both references remain editable.

How to use this tool

  1. Choose the direction

    Start from the percentage (“80%”) or from the weekly hours written in the contract.

  2. Check the full-time week

    35 h is the French statutory week; enter your company’s agreed duration if it is shorter, or another country’s full-time week.

  3. Enter the percentage or schedule

    A percentage from 0 to 100, or hours that do not exceed full time.

  4. Adjust the annual reference if needed

    1,607 h by default; an annualisation agreement may use another basis.

  5. Read the three equivalents

    Week for scheduling, month for payroll, year for annualised working time.

Part-time formulas

The percentage links the contract schedule to the full-time week; the month is derived from the week.

Working-time percentage

p = H ÷ Hft × 100

Share of full time represented by the weekly schedule.

Monthly hours

Hm = H × 52 ÷ 12

Monthly average used on payslips: 4.33 weeks per month.

Annual hours

Ha = 1,607 × p ÷ 100

1,607 h is the full-time year under the French Labour Code.

H
part-time weekly hours
Hft
full-time weekly hours (35 h statutory in France, or the agreed duration)
p
working-time percentage

Use cases

Moving to 80% or 90%

80% of 35 h gives 28 h a week and 121.33 h a month; 90% gives 31.5 h a week and 136.5 h a month.

Reading a 24-hour contract

24 h is 68.57% of full time, 104 h a month and about 1,101.9 h a year.

Checking the French 24-hour minimum

Below 24 h a week (68.57%), a French part-time contract needs a derogation: written employee request, branch agreement, short fixed-term contract or replacement.

Checking a payslip

Compare the monthly hours on the payslip with the contract schedule multiplied by 52 ÷ 12.

Shorter agreed full-time week

If an agreement sets full time at 32 h, 24 h is 75%, not 68.57%: enter the agreed duration.

Examples

80% of full time

28 × 52 ÷ 12 = 121.33 h.

Input

35 h, 80%

Result

28 h/week · 121.33 h/month · 1,285.6 h/year

24-hour contract

The general minimum for part-time work in France.

Input

35 h, 24 h a week

Result

68.57% · 104 h/month

Agreed 32-hour full time

The same hours represent a higher percentage.

Input

32 h, 24 h a week

Result

75%

Tips and best practices

  • Do not count a month as 4 weeks: 28 h × 4 = 112 h underestimates the average month of 4.33 weeks (121.33 h).
  • In France, part-time contracts must be at least 24 h a week (or the monthly equivalent), unless a branch agreement or a statutory derogation applies.
  • Part-time pay is proportional to the pay of an equivalent full-time job: 80% of the time gives 80% of the base salary.
  • The French contract must state how hours are spread across days or weeks: an 80% schedule can be four full days or five shorter days.
  • Hours worked beyond the contract schedule are “additional hours” in France, capped and paid at a premium: use the dedicated calculator to estimate them.
  • Paid leave earned does not depend on the percentage: an 80% employee in France also earns 2.5 working days per month.
  • Round only at the end: 68.571% shown as 68.6% is still exactly 24 h out of 35 h.

Sources and references

Frequently asked questions

How many hours is an 80% contract?

On a 35 h basis, 80% is 28 h a week, 121.33 h a month and 1,285.6 h a year. On a 39 h basis it would be 31.2 h a week.

How many hours are 50%, 60%, 70%, 75% or 90% part-time?

On a 35 h basis: 50% = 17.5 h a week (75.83 h a month), 60% = 21 h (91 h), 70% = 24.5 h (106.17 h), 75% = 26.25 h (113.75 h) and 90% = 31.5 h (136.5 h). Monthly hours are the weekly hours × 52 ÷ 12.

What percentage is 24 hours a week?

24 ÷ 35 × 100 = 68.57% of the French statutory week, or 104 h a month. It is also the general minimum for a part-time contract in France.

Why 151.67 hours a month for full time?

Because pay is averaged per month: 35 h × 52 weeks ÷ 12 months = 151.67 h. The same calculation applies to part-time: 28 h gives 121.33 h.

Where does 1,607 hours come from?

It is the full-time year in the French Labour Code: 1,600 h matching the 35-hour week, plus 7 h for the solidarity day.

Can part-time be under 24 hours a week in France?

Yes in some cases: a written, reasoned request from the employee (personal constraints, several jobs, studies), a branch agreement, a fixed-term contract of 7 days or less, replacing an absent employee, or employment by a private individual.

My full time is 39 hours: what percentage?

If 39 h is your collective schedule, enter 39 h as full time. Under French law, part-time is measured against the statutory 35 h or a shorter agreed duration; check the reference used in your contract.

Does an 80% employee work 80% of each day?

Not necessarily. The contract sets the pattern: four full days out of five, shorter days, or a monthly distribution.

How does this differ from the additional hours calculator?

This tool converts the working time agreed in the contract. The additional hours calculator measures hours worked beyond that schedule and their premium.

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