Rent Proration Calculator
Works out rent for a partial month by each accepted method — actual days in the month, a fixed 30-day month, and an annual day rate — and shows how far apart they are, because the lease decides which applies.
Your figures
Updates as you typeHow this is worked out
4 steps
- Days charged = 19 (inclusive of both the first and last day)
- Actual days: 1800 ÷ 30 × 19 = 1140
- Fixed 30-day month: 1800 ÷ 30 × 19 = 1140
- Annual day rate: 1800 × 12 ÷ 365 × 19 = 1124.38
Its 3 worked examples are re-run on every release, last on 14 September 2026. What changed
Sources and references
2 sources
What this calculator does
Works out rent for a partial month by each accepted method — actual days in the month, a fixed 30-day month, and an annual day rate — and shows how far apart they are, because the lease decides which applies.
How to use Rent Proration Calculator
Enter Monthly rent, First day paid for and Last day paid for. The calculator checks the values, applies the stated method, and updates the result without saving your figures.
What the result means
The result includes Actual days in the month, Fixed 30-day month, Annual day rate (365), Days charged, Days in that month, Daily rate, actual days, Highest of the methods, Lowest of the methods and Difference between them. Review the visible working and any warnings before using the answer for a decision.
Method and checks
The method cites Uniform Residential Landlord and Tenant Act §1.401, rent apportionment; Minnesota Statutes §504B.116. Its 3 built-in worked examples are checked on every full test run. The initial answer and working are rendered on the server, so they remain readable without JavaScript.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
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