Rent Increase Calculator
Enter the current rent and the increase, as a percent or in dollars, and get the new rent, what it adds up to over a year, and the earliest date the notice allows it to start.
Notice rules vary by state and by lease: 30 or 60 days is common for month-to-month tenancies, several states require more notice for larger increases, and rent-stabilized units have their own caps. A mid-term increase generally needs the lease to allow it.
General information for landlords, not legal advice. Statutes change and cities add their own rules; confirm current law where the property sits, or ask a local landlord-tenant attorney.
The two ways landlords state an increase
Rent increases arrive as a percentage or as a dollar figure, and the calculator handles both. Percentages are how markets and statutes talk: annual increases in the 3% to 5% range are typical when a lease renews, tracking inflation and local comparables. Dollar amounts are how conversations with tenants tend to go: fifty more a month reads plainer than 2.78%.
Whichever way you state it, know both numbers before you send the notice. The percentage tells you whether the increase is defensible against the market; the dollar figure, multiplied out to a year, tells the tenant what it really costs and tells you what the increase earns against the risk of a vacancy.
How the math works
The arithmetic is one line in each direction. A percentage increase multiplies the current rent; a dollar increase implies a percentage worth checking against the neighborhood.
New rent = current rent × (1 + % ÷ 100), or current rent + $ increase
Implied % = increase ÷ current rent × 100
Example: $1,800.00 + 5% = $1,890.00, which is $90.00/mo and $1,080.00/yr
Example: $1,800.00 + $150.00 = $1,950.00, an implied 8.33%
Notice: when the increase can start
An increase takes effect only after proper notice, and two clocks matter. The first is the legal minimum: commonly 30 days for a month-to-month tenancy, 60 or more in some states, and in several places the requirement grows with the size of the increase.
The second clock is period alignment. In most states a rent change can only start at the beginning of a rental period, which for month-to-month tenancies means the day rent is normally due. Serve a 30-day notice on June 15 and the clock runs out on July 15, but if rent is due on the 1st, the new amount typically starts August 1. That is why the calculator shows both dates.
Fixed-term leases work differently: the rent is locked until the term ends unless the lease itself says otherwise, so the practical moment for an increase is the renewal offer, sent 60 to 90 days before expiry.
A worked example
Riverside Apartments, Unit 4 rents month-to-month at $1,800.00, and the owner settles on a 5% increase with 30 days of notice, served June 15, 2026. Worked through:
- New rent: $1,800.00 × 1.05 = $1,890.00 a month
- Difference: $90.00 a month, $1,080.00 over a year
- Notice clock: June 15 + 30 days = July 15, 2026
- Rent is due on the 1st, so the first full month at $1,890.00 is August 1, 2026
Keeping an increase defensible
Put the notice in writing, deliver it the way the lease or statute requires, and keep a copy with the date it went out. Name the old rent, the new rent, and the exact date the new amount starts, so the ledger and the notice agree to the day.
Then weigh the retention math. A $90.00 increase earns $1,080.00 a year, and one month of vacancy at this unit costs $1,890.00 before turnover expenses. An increase a good tenant will stay through beats a bigger one that empties the unit; the difference between the two is the most expensive rounding error in this business.
Common questions
How much can I legally raise the rent?
In most states there is no cap on the amount, only rules about notice and timing. A handful of states cap annual increases statewide, California and Oregon being the best-known examples, and rent-stabilized or rent-controlled units in some cities have their own strict limits. Check the rules for the property’s location before setting the number.
How much notice does a rent increase require?
Commonly 30 days for a month-to-month tenancy, though several states require 60 or 90 days, and some scale the notice with the size of the increase. The lease can require more notice than the statute; it cannot require less. The increase also generally has to land on the start of a rental period.
Can rent go up in the middle of a lease?
Only if the lease says so. A fixed-term lease locks the rent for the term unless it contains an escalation clause with the amount or formula spelled out. Otherwise the increase waits for renewal, which is why renewal offers go out 60 to 90 days before the term ends.
What is a typical annual increase?
Somewhere in the 3% to 5% range is common in ordinary years, tracking inflation, taxes, insurance, and local comparables. The market sets the ceiling: an increase that pushes rent past comparable units invites a vacancy that costs more than the increase earns.
What happens if the tenant refuses the increase?
A rent increase is an offer of new terms. A month-to-month tenant who declines can give notice and leave, and a lease-holding tenant can decline renewal. If a tenant stays past the effective date after proper notice, the new rent applies. The practical move is a conversation before the paper: increases land better with a reason attached.
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