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Pro Rata Calculator

Calculate a pro rata amount for part of a period, or a part-time salary from full-time pay and hours. Simple prorate calculator for rent, bills and pay.

Pro rata amount
480.00
Rate per unit
40.00
Share of the period
40%
Remaining amount
720.00

What pro rata means

Pro rata means in proportion. A pro-rated amount is the share of a full amount that matches the part of the period you used. Rent of 1,200 for a 30-day month, for 12 days, is 1,200 × 12 ÷ 30 = 480. A pro rata salary works the same way with hours: a £40,000 full-time job of 40 hours a week pays £24,000 for 24 hours a week. Use it for rent, bills, subscriptions, holiday allowance or bonuses.

How to use it

  1. 1

    Choose the calculation

    Part of a period, or a part-time salary.

  2. 2

    Enter the full amount

    And the total units in the period (days, hours).

  3. 3

    Enter what was used

    Read the pro rata amount and the rate per unit.

Frequently asked questions

What is the pro rata formula?

Pro rata amount = full amount × units used ÷ total units.

How do I prorate rent for a month?

Divide the monthly rent by the days in that month, then multiply by the days you'll live there.

What does pro rata salary mean?

The full-time salary scaled to the hours you work. 24 of 40 hours means 60% of the full salary.

Is my data stored?

No. The calculation runs in your browser.

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