Prorate Amount between Two Dates

MM slash DD slash YYYY
Start of the month or year for the full amount.
MM slash DD slash YYYY
End of the month or year for the full amount.
MM slash DD slash YYYY
From Start Date to this Date, divided by the Full Period.
Enter the total to be prorated, such as the annual or monthly amount.
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Free Daily Proration Calculator Instructions

Calculate the prorated amount according to the exact number of days. Useful for prorating monthly, quarterly, or annual software subscription charges, tenant rent calculations, contract payments, and any other changes or cancellations to your agreements.

Dates are inclusive! Example for year 2025 (not a leap year):

  • If Start of Period is January 1 and End of Period is December 31, there are 365 days in the period.
  • If Prorate-To Date is January 31, the proration period is 31 days (8.49%) of the 365 day period.
  • If the Full Amount (i.e. amount to prorate) is $100, the proration result is $8.49, and the remaining amount is $91.51.

Another Example: if your contract renews annually on April 1, enter a Start Date of April 1, 2025, and an End Date of March 30, 2026, or else you’ll have an extra day.

We’ve confirmed this calculator is accurate as of Friday, April 3, 2026. If you ever find any errors or have enhancement requests, please Contact Us.