Prorate Calculator
Calculate prorated amounts for rent, salary, bills, and subscriptions.. Free, no signup, works in your browser.
About Prorate Calculator
This free prorate calculator determines the proportional amount you owe or are owed for a partial period. Enter the full amount, billing period, and your start or end date to get the prorated amount. Works for rent, salary, insurance premiums, subscriptions, and utility bills.
Frequently Asked Questions
How is a prorated amount calculated?
Prorated amount = (Full Amount ÷ Total Days in Period) × Number of Days Used. The daily rate is multiplied by the actual days in your partial period.
When is proration used?
Proration is commonly used for mid-month move-ins/move-outs (rent), partial pay periods (salary), mid-cycle insurance changes, and subscription billing adjustments.
Does the number of days in a month matter?
Yes. This calculator uses the actual number of days in the selected month (28-31) for accuracy, rather than assuming a flat 30-day month.
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