Calculating a rent increase means answering three things at once: what percentage the increase actually works out to, how much written notice the law requires in your state, and whether a rent-control or CPI-linked cap limits it. Enter your state, current rent, and proposed new rent below and the calculator handles all three — instantly, free, no signup. (Commercial rent escalation clauses work differently; this tool covers residential tenancies.)
Required written notice
Your increase
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Rent control / increase caps
Laws change — verify the current statute. Many cities have local rent-control or just-cause ordinances stricter than state law. Not legal advice.
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How this calculator works
Before a rent increase can take effect on a month-to-month tenancy, nearly every state requires advance written notice — anywhere from one rental period (Texas, under Tex. Prop. Code § 91.001) to 90 days (Oregon, and California for increases over 10%). Fixed-term leases work differently: the rent is locked until renewal unless the lease has an escalation clause. A few jurisdictions also cap the size of the increase — California's AB 1482 (5% + CPI, max 10%), Oregon's statewide cap, Washington's 2025 cap, DC rent stabilization, and New York's Rent Guidelines Board for rent-stabilized units. This tool combines those rules and computes your percent increase. See also our dedicated rent-increase guides for California, New York, Texas, Florida and Maryland.
Worked example: calculating a rent increase step by step
Calculating a rent increase is the same arithmetic in every state — what changes is the notice you must give and whether a cap applies. Suppose the current rent is $1,500 and the landlord wants to move it to $1,650.
Find the dollar difference. $1,650 − $1,500 = $150.
Divide by the old rent. $150 ÷ $1,500 = 0.10.
Multiply by 100 to get the rent increase percentage. 0.10 × 100 = 10%.
Annualize it. The tenant pays $150 more each month, so the annual rent increase is $150 × 12 = $1,800 more over a twelve-month term.
Check the notice period, then the cap. A 10% rise is exactly the point where several states change the rule — in California an increase over 10% requires 90 days’ notice instead of 30, and AB 1482 hard-caps most increases at 10% per 12 months.
The same steps run in reverse if you know the percentage and want the new rent: multiply the current rent by (1 + the percentage as a decimal). A 5% increase on $1,500 is $1,500 × 1.05 = $1,575.
Where CPI enters. A CPI rent increase calculation only matters where a statute ties the cap to inflation — California (5% + regional CPI, capped at 10%), Oregon, Washington, and DC rent stabilization are the main examples. In a state with no rent-control statute, CPI is a negotiating argument, not a legal ceiling.
Where an escalation clause enters. During a fixed term the rent is locked unless the lease itself contains a rent escalation clause setting out the formula and timing in advance. Without that clause, the increase waits for renewal — which is why the escalation language belongs in the lease from day one.
All 51 jurisdictions side by side
This calculator is the LeaseHelper reference for rent-increase notice periods and caps — the rules live here rather than in a separate table, because the answer depends on your current rent and the proposed rent, not just on your state. For the rules that are flat by state, the reference tables put every jurisdiction next to every other:
Late fee laws by state — statutory caps, mandatory grace periods, and the standard that applies where a state sets no cap.
All free LeaseHelper tools — late fees, void clauses, notice periods, deposits and rent increases, all 50 states + DC.
Rent increase rules by state
This is a rent increase calculator, a rent increase percentage calculator, and a rent escalation calculator in one — the percentage change, the new rent, and the written notice your state requires all come out of the same three inputs. Whether your lease calls it a rent escalation clause, an annual uplift, or just a raise, the arithmetic and the notice rule are identical.
For the full legal picture in one state — notice periods, rent-control status, late fees, deposits and required disclosures — open its guide:
Subtract the old rent from the new rent, divide by the old rent, then multiply by 100. A rise from $1,500 to $1,650 is $150 ÷ $1,500 = 0.10, or a 10% increase. The calculator above does this for you and then checks the result against your state's notice rule and any cap.
Does CPI limit how much a landlord can raise the rent?
Only where a statute ties the cap to it. California's AB 1482 allows 5% plus local CPI, hard-capped at 10% a year; Oregon allows the lesser of 10% or 7% plus CPI; Washington's 2025 cap is generally 7% plus CPI to a 10% maximum; and Washington DC's rent-stabilization program caps most increases at CPI + 2%. In states with no rent-control statute, CPI has no legal bearing on the increase at all.
How much notice does a landlord have to give before raising rent?
It varies by state — from one rental period (Texas and several states with no specific rent-increase statute) up to 90 days (Oregon; California for increases over 10%; Maryland for longer tenancies). Common requirements are 30 days, 60 days (Colorado, Delaware, Nevada, Vermont, Washington), and tiered periods based on tenancy length (New York: 30/60/90 days). Select your state above for the exact rule and citation.
Can a landlord raise rent in the middle of a fixed-term lease?
Generally no. During a fixed-term lease the rent is locked in until the term ends, unless the lease itself contains an escalation clause explicitly allowing a mid-term increase. Increases normally take effect at renewal or, for month-to-month tenancies, after the required written notice period.
Which states have statewide rent control?
California (AB 1482: 5% + local CPI, hard-capped at 10%/year for covered buildings), Oregon (lesser of 10% or 7% + CPI for buildings 15+ years old), and Washington (2025 law: generally 7% + CPI, max 10%, for covered units). New York caps increases on rent-stabilized units through the Rent Guidelines Board, and DC rent stabilization caps most increases at CPI + 2%. Many cities in other states (New Jersey, Maryland, Minnesota) have local ordinances.
What happens if a landlord gives less notice than required?
The increase is generally unenforceable until proper notice has been given and the full statutory period has run. The tenant owes only the original rent in the meantime, and the landlord must re-serve a compliant notice.
Is this calculator legal advice?
No. It provides general information about state statutes and is not legal advice. Notice periods and caps change, and many cities have local ordinances stricter than state law. Verify the current statute or consult a licensed attorney in your jurisdiction.
How do I calculate an annual rent increase?
Take the monthly dollar increase and multiply it by twelve. If rent goes from $1,500 to $1,650, the tenant pays $150 more each month, so the annual rent increase is $1,800 over a twelve-month term. To express it as a percentage, divide the increase by the old rent and multiply by 100 — here, 10%. Most statutory caps are written per 12-month period, so the annual figure is the one that gets measured against the cap.
What is a rent escalation clause, and can rent go up during a fixed-term lease?
During a fixed term the rent is locked at the agreed figure unless the lease itself contains a rent escalation clause — language agreed in advance that sets out when the rent adjusts and by what formula (a fixed percentage, a CPI link, or a set dollar step). Without that clause, a landlord must wait until renewal to raise the rent, no matter how much notice they give.
Disclaimer: This tool provides general information about state landlord-tenant law and is not legal advice. Laws change — verify the current statute before acting. Local rent-control and just-cause ordinances may be stricter than the statewide rules shown here. For complex situations or rent-controlled properties, consult a licensed attorney in your jurisdiction. Last reviewed: July 2026.