How to use this calculator
- Enter full-period rent, chargeable days, days in charging period.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Prorated rent = full-period rent × chargeable days / days in charging period.
Assumptions and limitations
This does not decide whether a lease requires calendar-month, 30-day or another legal convention.
Worked example
With full-period rent = 1200, chargeable days = 10, days in charging period = 30, prorated rent is approximately 400.
What the result means
Day inclusion and the chosen denominator must match the lease agreement.
Common questions
How should I interpret prorated rent?
Day inclusion and the chosen denominator must match the lease agreement.
What should I check before using this result?
This does not decide whether a lease requires calendar-month, 30-day or another legal convention.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.