Proration Calculator

Free proration calculator: bill a partial period fairly by days used.

How the proration calculator works

Enter the full period fee, the days in the period and the days used.

Daily rate = fee ÷ days in period. Prorated amount = daily rate × days used.

Example: a 300 monthly fee over 30 days is 10 per day; 12 days used is 120.

Prorate when a service starts or ends part-way through a billing period, and state your proration method in your agreement.

For information only – not financial, tax or legal advice. See our disclaimer.