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 updated: September 9, 2026 · Formulas verified by automated tests that block every release. Editorial review dates are shown in the sources block above.
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 $1,084.93 respectively — the lease determines which applies.
Three methods, one honest table
calendar: rent ÷ days in month · 30-day: rent ÷ 30 · annual: rent × 12 ÷ 365 — then × days occupied
Most prorated-rent pages pick one method and print one confident number. We show the spread instead, because the spread is the conversation: in a 31-day month the 30-day standard quietly charges more per day; in February it charges less. Neither is a trick — they're conventions — but "which convention does our lease name?" is a question worth askingbefore signing, with the difference in dollars on the table.
The part no calculator tells you: a number is not a right
Here is what the other prorated-rent pages leave out, and it is the thing most likely to cost you money. There is no federal law requiring a landlord to prorate rent at all, and in many states none at local level either. A tenants-rights organisation in Washington puts it plainly: no law compels proration when you move in or out, and a landlord is within their rights to refuse it — before the lease is signed.
So the number above is a negotiating position, not an entitlement. What converts it into one is a single line in the lease. Ask for it before signing, in writing, naming both the amount and the method:
"Rent for the partial month of [month] is prorated at [$X.XX] per day, calculated as monthly rent divided by the actual number of days in that month, for [N] days of occupancy beginning [date]. Total due for the partial month: [$Y.YY]."
Once that sentence is in a signed lease, it binds both sides — that is the whole difference between hoping and having. Three practical notes that follow from it:
- Ask before you sign, not after. Leverage exists only while the landlord still wants the unit filled. On move-out day it is gone.
- Moving out is a separate conversation from moving in. Rules differ, notice periods matter, and some states treat month-to-month terminations differently from fixed-term leases. Never assume a move-in agreement covers your last month.
- Write down which method you agreed on. "Prorated" without a convention is where disputes start — as the table above shows, the same move date can differ by dozens of dollars depending on whether the daily rate came from actual days, a flat 30, or the annual formula.
Everything above describes how proration works as arithmetic and as a lease term — that part travels anywhere. What does not travel is who may refuse it. Rental law is local: it differs between countries, and inside the United States between states and even cities. This page is information, not legal advice, and it cannot tell you what applies where you live.
So before you rely on the number in a dispute, check the rule where you rent. In the US, HUD publishes a directory of state housing offices. Elsewhere, the equivalent is your national or municipal tenancy authority — a rent tribunal, housing ministry, or tenants' advice service; in most countries the search term "tenancy authority" plus your city finds it in one step. Wherever you are, one rule holds everywhere: a proration clause written into a signed lease is what makes the number binding, whatever the local default happens to be.
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.
- Sources: HUD — state housing offices and tenant resources
- Last reviewed: September 8, 2026 by the CalcNotebook team
Frequently asked questions
Is my landlord legally required to prorate rent?
There is no federal law requiring it, and many states have no rule either — proration is usually a matter of the lease, not of law. A landlord can decline to prorate before the lease is signed. Once a proration clause is in the signed lease, both sides are bound by it. Rental law is local — it differs by country, and within the US by state and city — so if you believe the rule where you live says otherwise, check with your local tenancy authority (in the US, HUD keeps a directory of state housing offices). This is information, not legal advice.
What if my landlord refuses to prorate?
Before signing, that is their right, and your options are to negotiate, adjust the move date to the 1st, or accept the full month. Asking early helps: leverage exists while the unit is still empty. If you have already signed and the lease is silent, you are generally on the terms as written — a polite written request sometimes still works, especially with a landlord who wants a long tenancy.
Does prorated rent work the same when moving out?
Not necessarily, and assuming it does is a common and expensive mistake. Move-out proration depends on your notice period, on whether the lease is fixed-term or month-to-month, and on state rules for terminations. Some states are stricter about the final month than the first. Treat it as a separate agreement and get it in writing too.
Which proration method should I ask for?
The actual-days method (monthly rent ÷ days in that month) is the most common and the easiest to defend — it charges exactly for what you occupy. The flat-30 convention favours the landlord in 31-day months and the tenant in February; the annual method (rent × 12 ÷ 365) splits the difference year-round. The table above shows what each costs on your dates — pick one, name it in the lease, and the argument disappears.
Do I still owe a full security deposit if I move in mid-month?
Yes — deposits are not prorated. A deposit secures the tenancy rather than paying for days occupied, so it is charged in full regardless of the move date, alongside any first-month and last-month rent the lease requires. Budget for the deposit and the partial rent together; the calculator above covers only the rent portion.
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.