Finance calculators

Pro Rata Salary Calculator

Updated Sep 20, 2026 By Infinity Calculator
Rate Formulas
Currency & Full-Time Baseline
£
The salary a full-time employee earns in this role.
Your contract's full-time benchmark (e.g. 37.5, 40, 35).
Your Working Pattern
The hours you are actually contracted to work each week.
Tick if you only work part of the year (e.g. term-time only).
Caps the monthly figure; all other periods are derived from the capped amount.
Minimum Wage Check Settings
Sets the minimum wage threshold used in the check.
Used only for the wage compliance check, not the salary maths.
Full-Time Equivalent
80.00%
This is equivalent to 80.00% of full-time.
Full-Time
£45,000.00
per year
Pro Rata
£36,000.00
per year
Compliant
Show / Hide Periods
Pro Rata Gross Pay
Period Pro Rata Gross Full-Time Gross Basis
Annual Salary Split
Full-Time vs Pro Rata by Period
Values use a logarithmic scale so yearly and hourly figures fit on one chart.
Step-by-Step Solution

Introduction

A pro rata salary is the pay you get when you work less than full-time hours. If a full-time job pays £45,000 a year for 37.5 hours a week, and you work 30 hours, you earn a share of that salary, not the whole thing.

This Pro Rata Salary Calculator works out that share. Enter the full-time salary and hours, then pick how you want to set your own pattern: hours per week, days per week, or a percentage of full-time. The tool shows your pay per year, month, 4 weeks, 2 weeks, week, day, and hour.

You can also:

  • Pick from 7 currencies, including GBP, USD, EUR, and AUD
  • Add part-year or term-time working (like 39 weeks a year)
  • Set a monthly pay cap
  • Check your hourly rate against UK minimum wage rates from 2015–16 to 2025–26

The results include a step-by-step breakdown of the maths, plus charts that compare your pay to full-time pay. Use it to check a job offer, plan a move to part-time work, or make sure your pay is fair and legal.

How to use our Pro Rata Salary Calculator

Enter the full-time salary and your working pattern, and the calculator shows your pro rata pay per year, month, week, day and hour, plus your full-time equivalent (FTE) percentage and a minimum wage check.

Currency: Tap the money symbol you want, such as £ GBP or $ USD. All results use this currency.

Full-Time Annual Salary: Type the yearly pay for the full-time version of the job, before tax.

Full-Time Hours per Week: Type how many hours a full-time worker does each week, like 37.5, 40 or 35.

Working Pattern Mode: Pick how you want to set your hours, by hours per week, days per week, or a percentage of full-time.

Pro Rata Hours per Week: In hours mode, type the hours you actually work each week.

Full-Time Days per Week: In days mode, type how many days full-time means, usually 5.

Pro Rata Days per Week: In days mode, type how many days you actually work each week, like 3 or 4.

Percentage of Full-Time (%): In percent mode, type your FTE from 1 to 100, such as 80 for four days out of five.

Part-Year or Term-Time Working: Turn this on if you only work part of the year, like school term time.

Working Weeks per Year: Type the number of weeks you really work, such as 39 for term time.

Total Weeks in Year: Type the full year total to compare against, normally 52.

Apply Monthly Pay Cap: Turn this on if your monthly pay has a top limit.

Monthly Pay Ceiling: Type the most you can be paid in one month. All other periods come from this capped amount.

Tax Year: Choose the tax year to use for the UK minimum wage check.

Age Group: Choose your age band. This only changes the minimum wage check, not your pay maths.

Show / Hide Periods: Tick the pay periods you want in the table and chart, like monthly, weekly or hourly.

Calculate and Reset: Results update as you type, but press Calculate to refresh, or Reset to start again with the default values.

What Is a Pro Rata Salary?

"Pro rata" is Latin for "in proportion." A pro rata salary is the pay you get when you work less than full-time hours. You earn the same rate as a full-time worker, but you get a smaller share of the yearly salary because you work fewer hours, fewer days, or fewer weeks.

Job ads often say something like "£45,000 pro rata." That number is the full-time salary. If you work part-time, your real pay will be less. A pro rata salary calculator shows you the actual amount you will take home before tax.

How Pro Rata Pay Is Worked Out

The math is one step. You compare your hours to full-time hours, then multiply that share by the full-time salary:

Pro Rata Salary = Full-Time Salary × (Your Hours ÷ Full-Time Hours)

Example: A job pays £45,000 for 37.5 hours a week. You work 30 hours a week. That is 30 ÷ 37.5 = 0.8, or 80%. So your pay is £45,000 × 0.8 = £36,000 a year, which is £3,000 a month.

What FTE Means

FTE stands for Full-Time Equivalent. It is your share of a full-time job, shown as a percent. A 0.8 FTE (80%) worker does four days out of five. A 0.5 FTE (50%) worker does half the hours. Employers use FTE to set pay, holiday, and pension amounts fairly.

Part-Year and Term-Time Work

Some jobs only run part of the year. School staff are a good example. They may work full days, but only for 39 weeks instead of 52. In that case you add a second step: multiply by the weeks you work divided by the weeks in the year (39 ÷ 52 = 0.75). Both cuts stack, so a term-time worker on 30 hours could end up at 60% of the full-time salary.

Things That Are Shared Pro Rata

  • Holiday, so a part-timer on three days a week gets fewer paid days off, but the same number of weeks.
  • Bonuses, often scaled to your FTE.
  • Pension, where payments are a percent of your real pay, not the full-time figure.

Minimum Wage Still Applies

Going part-time never lowers your hourly rate. Your hourly pay must still meet the legal minimum wage for your age. In the UK this is the National Minimum Wage, or the National Living Wage for older workers. Rates change each April, so check the tax year that matches your pay. If your pro rata hourly rate falls under the limit, your employer must fix it.

Why Check Your Pro Rata Pay

Knowing the real number helps you compare job offers, plan a budget, and spot payslip mistakes. It also helps if you ask to cut your hours, since you can see the drop in monthly pay before you decide. The figures here are gross pay, which is the amount before income tax, national insurance, and pension are taken off.

Formulas used

Working-pattern ratio (FTE)
\text{Ratio} = \frac{\text{Pro Rata Hours}}{\text{Full-Time Hours}} \quad\text{or}\quad \frac{\text{Pro Rata Days}}{\text{Full-Time Days}} \quad\text{or}\quad \frac{\text{Percent}}{100}
Part-year (weeks) ratio
\text{Weeks Ratio} = \frac{\text{Working Weeks per Year}}{\text{Total Weeks in Year}}
Pro rata annual salary (before cap)
\text{Annual}_{\text{raw}} = \text{Full-Time Salary} \times \text{Ratio} \times \text{Weeks Ratio}
Monthly pay cap applied to annual figure
\text{Annual}_{\text{eff}} = \min\!\left(\frac{\text{Annual}_{\text{raw}}}{12},\ \text{Cap}\right) \times 12
Pay period breakdown
\text{Monthly} = \frac{\text{Annual}_{\text{eff}}}{12},\quad \text{4-Weekly} = \frac{\text{Annual}_{\text{eff}}}{13},\quad \text{2-Weekly} = \frac{\text{Annual}_{\text{eff}}}{26},\quad \text{Weekly} = \frac{\text{Annual}_{\text{eff}}}{\text{Weeks Worked}}
Daily and hourly pro rata rates
\text{Daily} = \frac{\text{Annual}_{\text{eff}}}{\text{Days per Week} \times \text{Weeks Worked}},\quad \text{Hourly} = \frac{\text{Annual}_{\text{eff}}}{\text{Hours per Week} \times \text{Weeks Worked}}
Full-time comparison rates
\text{FT Daily} = \frac{\text{Salary}}{\text{FT Days} \times 52},\quad \text{FT Hourly} = \frac{\text{Salary}}{\text{FT Hours} \times 52}
Minimum wage compliance check
\text{Compliant} \iff \text{Hourly} \ge \text{Minimum Wage Rate}

Frequently asked questions

How do you work out pro rata pay when you start a job part-way through the month?

Most employers use one of two methods:

  • Working days: Yearly salary ÷ 260 working days × the days you actually worked.
  • Calendar days: Yearly salary ÷ 365 × the calendar days you were employed.

Example: on £30,000 a year, starting with 10 working days left in the month gives £30,000 ÷ 260 × 10 = £1,153.85 for that first month.

Your contract should say which method your employer uses. The same maths is used when you leave a job mid-month.

Is pro rata the same as part-time?

No, but they are linked. Part-time describes the job: you work fewer hours than a full-time worker. Pro rata describes the pay: a fair share of the full-time salary based on those hours.

Pro rata is also used for things that have nothing to do with part-time work, like pay for a partial month, a bonus for someone who joined in July, or a pay rise that starts mid-year.

Can an employer pay a part-time worker a lower hourly rate than full-time staff?

No, not for doing the same job. In the UK, the Part-time Workers Regulations say part-timers must not be treated worse than comparable full-time staff without a good business reason.

That means the same hourly rate, the same overtime rules once you pass full-time hours, and a fair share of perks like bonuses, pension, and holiday. Paying less per hour just because someone is part-time is unlawful.

How many paid holiday days do you get if you work 3 days a week?

The legal minimum in the UK is 5.6 weeks of holiday a year. For a part-timer, you count it in weeks, then turn it into days:

5.6 × 3 days = 16.8 days a year

A 4-day worker gets 22.4 days, and a full-time 5-day worker gets 28 days. Everyone gets the same number of weeks off; only the day count changes.

Do part-time workers get paid for bank holidays?

There is no legal right to paid bank holidays, but if full-time staff get them, part-timers must get a fair share.

Many employers add a pro rata amount to your holiday pot instead. If there are 8 bank holidays and you work 3 days out of 5, you get 8 × 0.6 = 4.8 days added to your allowance. You then book time off when a bank holiday falls on a day you work.

This stops staff who never work Mondays from losing out.

How many hours a week is 0.8 FTE?

It depends on what full-time means in your contract:

  • 37.5-hour week → 0.8 FTE = 30 hours
  • 40-hour week → 0.8 FTE = 32 hours
  • 35-hour week → 0.8 FTE = 28 hours

Always check the full-time figure first. The same FTE number can mean different hours at different employers.

How do you turn a yearly salary into an hourly rate?

Divide the yearly salary by the hours you work in a year:

Hourly rate = Salary ÷ (hours per week × weeks worked)

Example: £36,000 for 30 hours a week over 52 weeks is £36,000 ÷ 1,560 = £23.08 an hour.

If you only work part of the year, use your real working weeks instead of 52. This is the figure to compare against minimum wage.

Why do term-time staff get paid the same amount every month?

Term-time staff usually work about 39 weeks a year but get paid in 12 equal monthly amounts. The employer works out the year's pay, then spreads it evenly so you still get money during school holidays.

So your monthly payslip looks steady, but the yearly total is lower than the full-time figure in the job advert. Your hourly rate stays the same.

Do you pay less tax on a pro rata salary?

Yes, because tax is charged on the money you actually earn, not the full-time figure in the advert.

Lower pay can also mean a smaller share goes to tax. The UK personal allowance (£12,570 for most people) is tax free, so dropping to part-time can push more of your pay below the higher tax bands. National Insurance and pension payments also drop, since they are worked out on real earnings.

Do you get overtime pay for extra hours on a part-time contract?

Usually you are paid your normal hourly rate for extra hours until you pass the full-time hours for your job. Only after that do enhanced overtime rates kick in, if your employer offers them.

Example: you work 25 hours a week and full-time is 37.5. Hours 26 to 37.5 are normally paid at your standard rate. Check your contract, as some employers pay extra sooner.

Does part-time work affect sick pay and maternity pay?

It can. Statutory Sick Pay and statutory maternity pay depend on your average weekly earnings, not your hours.

You must earn at least the lower earnings limit, around £125 a week in 2025–26, to qualify. Maternity pay for the first 6 weeks is 90% of your actual average weekly earnings, so lower pay means a lower amount. Very low-hours jobs can miss the limit completely.

Should you use 52 or 52.18 weeks when working out weekly pay?

A year is really 52.18 weeks (365 ÷ 7). Most employers use 52 because it is simpler, and it gives a slightly higher weekly figure.

Example: £36,000 ÷ 52 = £692.31 a week, but £36,000 ÷ 52.18 = £689.92. The gap is small, though it matters when checking minimum wage or working out a daily rate. Use whichever number your contract or payroll uses.

Related Finance calculators

All Finance calculators
Finance

Annual Income Calculator

Calculate your annual income from hourly, weekly, or monthly pay. Use our free annual income calculator to estimate your total yearly earnings quickly and accurately.

Open Finance

Commission Calculator

Use our free commission calculator to quickly compute sales commissions. Enter your sale amount and rate to instantly calculate your earnings.

Open Finance

Hourly Rate Calculator

Calculate your hourly rate from salary or project fees. Use our free hourly rate calculator to determine fair pricing for freelance and employment work.

Open Finance

Hourly to Salary Calculator

Convert your hourly wage to an annual salary with our free hourly to salary calculator. Instantly estimate yearly, monthly, and weekly earnings.

Open Finance

Overtime Calculator

Free overtime calculator to compute your overtime pay instantly. Enter hours worked and hourly rate to calculate time-and-a-half and double-time earnings.

Open Finance

Pay Raise Calculator

Use our free pay raise calculator to quickly determine your new salary, hourly rate, and take-home pay after a raise. Calculate percentage and dollar increases.

Open Finance

Salary to Hourly Calculator

Use our free salary to hourly calculator to quickly convert your annual salary to an hourly wage. Find out how much you earn per hour based on your work schedule.

Open Finance

Take Home Pay Calculator

Calculate your take home pay after taxes and deductions. Free take home pay calculator shows your net income from gross salary quickly and accurately.

Open