Prorate Calculator
Prorates any charge between two dates for mid-cycle starts on subscriptions, rent, or services
Total charge for the full billing period
When the billing period begins
When the billing period ends
The date proration begins
Number of days in the full billing period
Number of days you are being charged for
Charge per day based on the full period
Amount owed for the partial period
Frequently Asked Questions
What does prorate mean?
Prorating means dividing a charge proportionally based on actual usage within a billing period. If a monthly subscription costs $30 and you start on the 15th of a 30-day month, your prorated charge is $15 (half the month). It ensures you only pay for the time you actually use a service.
How do you calculate a prorated amount?
Divide the full-period charge by the total days in the period to get the daily rate, then multiply by the number of days you are using. Formula: (Full Charge / Total Days) x Billable Days. Some companies use 30-day months for simplicity regardless of actual month length.
When is proration commonly used?
Proration is standard for rent (mid-month move-ins), SaaS subscriptions (plan changes), insurance premiums (mid-term adjustments), utility bills (service start/stop), employee salaries (mid-period hires), and property taxes (real estate closings).
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