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How to Calculate Prorated Rent

For a partial month, prorated rent = monthly rent × chargeable occupancy days ÷ the daily-rate divisor that applies. The divisor may be the actual calendar days in that month, 30, or an annual 365-day basis; there is no single national formula established by the examples below, so check mandatory state law and the written lease before calculating.

Formula: monthly rent × chargeable days ÷ applicable divisor = partial-month rent. Count the dates the applicable rule says are chargeable, and round only the final amount to cents.

First identify what rule governs this partial month

A calculator can multiply a daily rate by a day count, but it cannot decide which daily rate is legally or contractually applicable. The same monthly rent and dates can produce different answers under different divisors. Before entering numbers, identify the state and the event: a new tenancy starting mid-month, a lease ending before month-end, or an agreed move date during a continuing lease may be governed by different terms.

Read the lease clause for a stated proration method, day-count convention, chargeable start or end date, and rounding instruction. Then check whether a state statute makes a method mandatory for this exact circumstance. A contract cannot safely be treated as overriding a non-waivable statutory rule. If the lease is silent and no applicable rule answers the question, do not assume that a popular calculator formula or an asserted “industry standard” controls; get the landlord’s written calculation and verify the local rule before paying or disputing the amount.

When each divisor is supported—and when it is not

Actual calendar days: use when the controlling rule calls for that month’s real length

Minnesota Statutes section 504B.116 is a specific statutory example, not a nationwide definition. The 2026 Minnesota Statutes page says that when a residential lease ends before the last day of its final month, the final month’s rent must be prorated at that month’s average daily rate so the tenant pays only for the actual days occupancy is allowed. Subsection (b) expressly uses the actual calendar-day count for the calendar month in which the lease expires. The statute also says an attempted waiver is void and unenforceable. For that covered ending-of-lease situation in Minnesota, substituting a 30-day divisor or annual/365 divisor would conflict with the stated actual-calendar-day basis.

Minnesota’s neighboring section 504B.146 adds a separate lease-disclosure requirement: when a written lease requires a move-in or move-out date other than the first or last day of a month and rent is prorated, the lease must state the prorated amount for the relevant months on its first page. That provision does not itself establish a universal divisor for every mid-month move. Read the two sections together only for their text: one covers the specified final-month calculation; the other requires a written lease to state an amount in the described circumstance. Neither page proves that all states use actual days.

Choose the actual-days calculation only after confirming that the applicable statute or lease uses the calendar month’s actual length and that you have counted the same occupancy dates the rule counts. It will be the wrong method if you use it merely because February has fewer days, while an applicable written clause specifies a different valid method, or where a mandatory law supplies another rule. A March or 31-day-month example cannot be generalized to a different state or a different move-out scenario.

Thirty-day month: use only within a rule, program, or lease that specifies a 30-day basis

California Department of Transportation Exhibit 11-EX-5, “Rent Proration Examples,” revised January 2020, instructs that applicable rent and utility prorations use a 30-day month to determine the daily rate regardless of the calendar month’s length. Its stated calculation is monthly rent divided by 30, multiplied by the days owed; it says not to round the daily rate first, includes the start date or vacate date in its examples, and rounds the final prorated amount to the nearest penny. The exhibit also caps its partial-month charge at the monthly rent. These are the instructions of that Caltrans exhibit for its program context, not a California residential landlord-tenant statute or proof of a general rental custom.

The exhibit demonstrates why the label “30-day method” is incomplete without the accompanying day-count and cap rules. In its March example, the source uses a $500 monthly amount, a March 17 start, and 15 chargeable days, then calculates $500 ÷ 30 × 15. In another example, its raw calculation for a 31-day month exceeds the monthly rent and the exhibit applies its stated cap. Its February example still divides by 30, including the leap-year note. Copying only “divide by 30” while omitting those context and handling rules would not reproduce the source’s procedure.

Use this divisor when the governing agreement or applicable program expressly calls for a 30-day month and its included-day and cap rules fit your case. Do not select it just because an online tool defaults to 30, and do not describe the Caltrans relocation exhibit as the rule for private residential leases. If the lease instead promises actual calendar days, or a mandatory statute governs, a 30-day shortcut can charge more or less than that rule permits.

Annual rent divided by 365: use only when the applicable lease actually sets that basis

A public SEC filing provides a concrete example of a different contractual arrangement. The filing includes a commercial lease whose base-rent clause says that a fractional month accrues daily at a rate equal to 1/365 of the applicable annual rent. That clause binds the parties to that document under its terms; it is not a statute, government recommendation, or residential rental standard. The source shows that 365-day proration can be expressly written into a lease, not that every monthly residential rent should be converted to an annual amount and divided by 365.

The clause is framed around annual rent and a fractional payment period, including a payment date falling after the first day of a month. Its calculation therefore starts with the applicable annual rent named by that lease, not an unexplained assumption that any monthly amount should automatically be multiplied by twelve. A different contract may define annual rent, leap-year treatment, chargeable dates, or partial periods differently. The SEC archive preserves the filed document; it does not adjudicate whether this clause governs another tenant or another property.

Choose annual/365 only if your own controlling lease clearly applies that basis to the rent and period you are calculating, and no mandatory law displaces it. Do not use a 365 divisor merely because rent is quoted monthly, and do not treat one commercial lease as authority for a household tenancy. If a rule or lease specifies actual days or a fixed 30-day month, the annual/365 result is not an interchangeable estimate.

Worked comparison: one set of dates, three source-specific methods

Example assumption: assume monthly rent of $1,800 and occupancy from March 16 through March 31, inclusive. That is 16 assumed chargeable days. The dates and rent are invented for arithmetic illustration; they are not a real tenant record and do not identify which method governs a particular home.

Actual-calendar-day arithmetic: March has 31 calendar days, so $1,800 ÷ 31 × 16 = $929.03 after rounding the final result to cents. This is the arithmetic form reflected in Minnesota’s actual-calendar-day statute for the specific covered final-month circumstance; the example does not expand that statute to other cases.

Thirty-day arithmetic: $1,800 ÷ 30 × 16 = $960.00. This follows the divisor in the Caltrans exhibit, but a real application must also follow its scope and relevant day-count/cap instructions. It does not establish a right to use that formula for this assumed residential tenancy.

Annual/365 arithmetic: if, solely as an example assumption, the applicable lease defines annual rent as twelve times $1,800, then $1,800 × 12 ÷ 365 × 16 = $946.85. The source lease supports this kind of formula only where its own annual-rent clause applies; the calculation is not a legal conclusion about the assumed dates.

The three results differ because their denominators differ, not because one arithmetic operation is inherently more accurate in every situation. First select the method supported by the controlling law or lease; only then count the chargeable dates and calculate. Comparing outputs can reveal why two statements disagree, but a lower or higher result does not decide which party is entitled to it.

What to check before you pay or request a correction

Keep the signed lease clause, the rent amount for the relevant period, the move-in or move-out date, and the written day-count explanation together. Ask whether the date of possession or the lease’s stated start/end date controls, whether the move date is included, and whether the quoted amount is capped at a full month’s rent. Check that the calculation does not mix a calendar-month method with an annualized amount or round the daily rate before the source’s instructed step.

If the landlord and tenant use different methods, ask for the clause or statute supporting the divisor rather than arguing from a calculator result. If a statute covers the exact scenario, compare the lease calculation with that provision. If neither the written terms nor the rule you can verify resolves it, request a written agreement or contact a local tenant-information service; the three sources on this page do not establish a national fallback custom.

This page explains arithmetic and the narrow scope of cited materials. It does not determine a lease’s enforceability or replace state-specific legal guidance. The Minnesota statute applies to the circumstance stated in its text; the Caltrans exhibit governs its own administrative examples; and the SEC-filed commercial lease is evidence of one contract term only.

Sources and scope

Minnesota § 504B.116 · Minnesota § 504B.146 · Caltrans Exhibit 11-EX-5 · SEC-filed lease. Sources checked November 5, 2026. No publication date is assigned to the current statute text; the Caltrans exhibit prints revision 1/2020; the SEC filing is a filed contract example.

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To run a partial-month calculation, use the rent proration calculator.