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Partial-month rent, exact to the cent. Enter the monthly rent, the move-in or move-out date, and the days in the month. This pro rate calculator for rent works out the daily rate, the days charged and the amount due, and prints the arithmetic behind every figure — no sign-up, nothing to install.
Prorated rent for a move-in on October 15, 2026
$59.6774 a day × 17 days charged
Filled from October 2026 (31 days). Override it if your lease bills on a different cycle.
Deposit and other up-front costs are added to the prorated rent for a total due at move-in. Leave them blank if they are not part of this calculation.
The daily rate is carried at full precision through the multiplication, and only the final figure is rounded to the nearest cent: a third decimal of 5 to 9 rounds up, 0 to 4 rounds down.
Two month strips, one rule: the shaded cells are the days charged, and the move date itself is counted on both ends of the partial month.
The figure above shows the rule; this table shows it running on four cases — the default move-in, a move-out, a leap-year February, and a lease that bills on a flat 30 days. Every row can be re-checked against the calculator on this page.
| Case | Working | Figure |
|---|---|---|
| Move-in on October 15, rent $1,850.00 | 1,850.00 ÷ 31 days, the 15th through the 31st — 17 days | $1,014.5259.677419 × 17, rounded once |
| Move-out on June 21, rent $1,200.00 | 1,200.00 ÷ 30 days, the 1st through the 21st — 21 days | $840.0040.0000 × 21 |
| Move-in on February 20, 2028 — leap year, rent $1,500.00 | 1,500.00 ÷ 29 days, the 20th through the 29th — 10 days | $517.2451.724137 × 10 |
| Move-in on October 15, days set to 30 — a 30-day billing month, rent $1,850.00 | 1,850.00 ÷ 30 days, the 15th through the 30th — 16 days | $986.6761.666666 × 16 |
A move-out counts from the other end: the daily rate times the days from the first through the move-out day, inclusive. The same $1,200.00 rent and the same 30-day month give two different answers depending on which way the tenant leaves — moving out on the 21st charges 21 days, $840.00; moving in on the 21st charges the 21st through the 30th, 10 days, $400.00. Switch the calculator to Move out and the same arithmetic runs the other direction.
The days field follows the calendar month of the date you pick, so February answers change between leap years and ordinary ones. A $1,500.00 rent with a move-in on February 20 is $517.24 in 2028, when February has 29 days: 51.724137 a day × 10 days (the 20th through the 29th). In an ordinary February the same date gives 28 days and a higher daily rate — 53.571428 a day × 9 days (the 20th through the 28th), $482.14. Same rent, same move date, $35.10 apart.
Not every lease runs on the actual days of the calendar month. Some bill on a flat 30-day cycle — say the 1st through the 30th — and the days field is the override: it sets how long the billing month is. Type 30 and the same $1,850.00 move-in on the 15th gives 61.666666 a day × 16 days (the 15th through the 30th), $986.67. The page does not decide which cycle a lease requires; it computes the figure you point it at, and prints which one it used.
The daily rate is carried at full precision through the multiplication, and only the final amount is rounded to the nearest cent — a third decimal of 5 to 9 rounds up, 0 to 4 rounds down. The alternative, rounding the daily rate to the cent first, moves the total by a few cents on longer partial months: $1,500.00 ÷ 31 carried through is 48.387096 a day, and 22 days gives $1,064.52; rounding the daily rate to $48.39 first gives $1,064.58 on the same 22 days. This page carries the rate through and rounds once, and says so under the result.
The deposit side of a move-out is state law, and the numbers differ enough to change what a tenant is owed. Four states are set out below, each quoted from the statute itself, with the date the version took effect. The two things worth knowing before a move-out are how large the deposit may be and how fast it has to come back.
Cal. Civ. Code §1950.5(c)(1) caps the deposit at one month's rent: "a landlord shall not demand or receive security, however denominated, in an amount or value in excess of an amount equal to one month's rent, in addition to any rent for the first month paid on or before initial occupancy." The cap applies to a security demanded on or after July 1, 2024 — §1950.5(c)(6) says the subdivision "shall not apply to a security collected or demanded by the landlord before July 1, 2024." One carve-out: §1950.5(c)(5)(A) lets a natural-person landlord who owns no more than two rental properties totalling four or fewer units ask for "an amount equal to two months' rent." The money comes back on a shorter leash — §1950.5(h)(1): "No later than 21 calendar days after the tenant has vacated the premises … the landlord shall furnish the tenant … a copy of an itemized statement … and shall return any remaining portion of the security to the tenant." For a tenant that means a month's rent is the ceiling, and an itemized bill is due inside three weeks. (Current text as amended by AB 414, effective January 1, 2026.)
Texas Property Code §92.103(a) sets only the clock: "the landlord shall refund a security deposit to the tenant on or before the 30th day after the date the tenant surrenders the premises." Nothing in chapter 92 caps how much a landlord may ask, so Texas sets no statewide limit on deposit size. For a tenant that means the dispute in Texas is about the 30-day deadline and what was deducted, not about how large the deposit was — a three-month deposit is not unlawful in itself. (Current text of §92.103 effective January 1, 1996.)
Fla. Stat. §83.49(3)(a) runs two clocks off one move-out: "if the landlord does not intend to impose a claim on the security deposit, the landlord must return the security deposit, together with interest if otherwise required, within 15 days after the termination of the rental agreement," and where a claim is coming the landlord must give written notice "within 30 days after the termination of the rental agreement." Florida sets no statewide cap on deposit size. For a tenant the 15-day clock is the one that matters: a landlord who stays silent past it forfeits the right to claim against the deposit at all. (The 2026 Florida Statutes.)
Conn. Gen. Stat. §47a-21(b)(1) is the tightest cap of the four: "In the case of a tenant under sixty-two years of age, a landlord shall not demand a security deposit in an amount that exceeds two months' rent," and §47a-21(b)(2) drops that to "one month's rent" for a tenant "sixty-two years of age or older." The refund deadline is §47a-21(d)(2): "Not later than twenty-one days after termination of a tenancy or fifteen days after receiving written notification of such tenant's forwarding address, whichever is later." For a tenant that means handing over a forwarding address in writing starts a 15-day clock, and the landlord has to beat whichever of the two dates lands later. (2026 Supplement, revised to January 1, 2026.)
None of these four statutes requires a landlord to prorate rent when a tenant moves in or moves out mid-month — the deposit caps and refund deadlines are all they set, and how the partial month is split falls to the lease agreement. That is a conclusion from reading the four statutes above, not a guess about the rest of the country.
Divide the monthly rent by the number of days in the billing month to get a daily rate, then multiply by the number of days the tenant occupies the unit. On a move-in the charge runs from the move-in day through the end of the month; on a move-out it runs from the first through the move-out day. Both counts include the move date itself. A $1,850.00 rent in a 31-day month with a move-in on the 15th is $59.6774 a day × 17 days, $1,014.52.
A partial month's rent: the tenant pays only for the days they actually occupy the unit during an incomplete billing period, instead of the full monthly figure. To prorate my rent this way is the difference between a tenant paying for a month they never spent in the unit and a landlord writing off a fortnight of rent.
Yes, and it changes the answer. Dividing by the actual days means the daily rate differs between February and March — the same $1,500.00 rent works out to $51.7241 a day in a 29-day February and $48.3871 a day in a 31-day March. The days field on this page fills itself from the calendar month of the date you pick, and you can override it if your lease bills on a different cycle.
Requirements vary by state and local law. What state statutes actually set is the deposit side: how large a deposit may be and how fast it comes back. California, Texas, Florida and Connecticut are worked out in the section above, and none of the four requires a landlord to prorate rent at move-out — in those states the split falls to the lease agreement. A proration clause in the lease protects both sides either way.
Same formula, other end of the month: the daily rate times the days from the first through the move-out day, inclusive. A $1,200.00 rent in a 30-day month with a move-out on the 21st is $40.0000 a day × 21 days, $840.00. Switch the calculator to Move out and it counts from the 1st.
The deposit is separate from rent, but it is usually collected at the same time as the first payment, so the amount a tenant actually pays at move-in is the prorated rent plus the deposit plus any other up-front costs. This page adds them only when you fill in the optional fields.
Move-in proration is typically collected with the first rent payment. Move-out proration may be the final payment or a refund if the tenant prepaid a full month. The timing should be written into the lease so a partial month does not arrive as a surprise.