Prorated Rent
Moving in on the 10th? Your partial month has three defensible prices, and the difference lands on someone. See all three methods side by side — then let the lease, not the louder voice, pick one.
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Last reviewed: July 20, 2026 · Formulas verified by automated tests before every release.
How do you calculate prorated rent?
Prorated rent = daily rate × days occupied (the move day counts). The daily rate depends on the method: monthly rent ÷ actual days in the month, ÷ 30 flat, or × 12 ÷ 365. Moving in on July 10 with $1,500 rent gives $1,064.52, $1,100.00 or $1,084.93 respectively — the lease determines which applies.
Three methods, one honest table
calendar: rent ÷ days in month · 30-day: rent ÷ 30 · annual: rent × 12 ÷ 365 — then × days occupied
Most prorated-rent pages pick one method and print one confident number. We show the spread instead, because the spread is the conversation: in a 31-day month the 30-day standard quietly charges more per day; in February it charges less. Neither is a trick — they're conventions — but "which convention does our lease name?" is a question worth asking before signing, with the difference in dollars on the table.
Moving math, complete
The partial month is one line of a bigger move: splitting the new rent fairly if incomes differ (Split by Income), counting days between lease dates (Date Calculator), and the hotel nights in between homes (Hotel Nights). Counting a notice period is the step right before this one.
Sources, assumptions and limitations
- Formula: prorated = daily rate × occupied days (move day inclusive); three daily-rate conventions shown side by side
- Assumptions: Rent is a flat monthly amount; the move day is billed (near-universal practice); February-through-31-day-month differences are exactly why the annual method exists.
- Not included: Deposits, fees, utilities proration, jurisdiction-specific rules — your lease and local law govern which method applies. This page informs the conversation; it doesn't override the contract.
- Last reviewed: July 24, 2026 by the CalcNotebook team
Frequently asked questions
How is prorated rent calculated?
Daily rate × days occupied, counting the move day itself. The catch is the daily rate: dividing by the actual month length, by a flat 30, or using the annual rate (rent × 12 ÷ 365) gives three different daily prices — this calculator shows all three so you can see exactly what your lease's method costs.
Which proration method is correct?
Whichever your lease specifies — none is universally "correct". The 30-day standard is common for its simplicity; calendar-month matches the actual days; the annual method smooths February against July. If the lease is silent, it becomes a negotiation: now you'll negotiate with all three numbers in hand.
Does the move-in day count as a rented day?
Almost universally yes — if you get the keys on the 10th, the 10th is yours and billed. This calculator counts it. Move-out mirrors it: the day you hand keys back is typically your last billed day.
My landlord's number is different — are they wrong?
Probably just a different method: on a 31-day month the 30-day standard bills slightly more per day than the calendar method. Compare their figure against all three lines above — the match tells you which method they used, and the lease tells you whether that's the agreed one.