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Rent Increase Calculator

Use this free rent increase calculator to work out a new rent in seconds. Enter the current rent and the increase as a percentage or a dollar amount, and it shows the new monthly rent, the extra cost per month and per year, and whether the increase fits inside a rent-control cap you set.

How it works

A rent increase is simple arithmetic with real consequences: a small percentage on a large rent adds up to serious money over a year. This calculator handles it in both directions. If you know the percentage, it multiplies the current rent by that percentage to find the dollar increase, then adds it to the current rent. If you know the dollar amount, it adds that amount to the current rent and works out what percentage the increase represents. Either way it also shows the extra cost per month and per year, so both landlord and tenant can see the full picture rather than just the new monthly figure.

The two formulas are mirror images. For a percentage increase: new rent = current rent × (1 + percentage ÷ 100). For a dollar increase: new rent = current rent + dollars, and percentage = dollars ÷ current rent × 100. A 5% increase on $1,500 is $75 a month, which sounds modest until you multiply it by 12: $900 a year. That annual view is the one that matters for a household budget, and it is also the view a landlord should use when judging whether the increase covers rising taxes, insurance, and maintenance costs.

The optional cap check is where the law enters the picture. Some states and cities limit how much rent can rise in a year. California's statewide rent cap, for example, generally limits annual increases to 5% plus the local rate of inflation (CPI), with a total ceiling of 10% per year, for properties covered by the law. Other places have their own caps — Oregon, for instance, ties its limit to inflation plus a fixed percentage — and many places have no cap at all. Enter the cap that applies where the property sits and the calculator will tell you whether the increase fits inside it. The default of 8% is just an example (5% plus roughly 3% CPI); it is not legal advice, and exemptions are common — newer buildings, single-family homes owned by small landlords, and owner-occupied properties are often exempt, so check your local law rather than trusting a single number.

Timing matters as much as the amount. During a fixed-term lease the rent is normally locked in unless the lease itself allows an increase, so most increases take effect at renewal or when a tenancy becomes month-to-month. Landlords also have to give proper written notice, and the required notice period grows with the size of the increase in many states — 30 days for a small increase, 60 or 90 days for a larger one. Tenants who receive an increase notice should check three things: that the notice period is correct, that the new amount respects any local cap, and that the increase is not retaliatory — for example, imposed shortly after a tenant complained about repairs or joined a tenants' association, which is unlawful in most states.

For landlords, the honest way to set an increase is to look at both sides of the ledger: what comparable homes nearby actually rent for, and what the property now costs to run. If similar homes rent for $1,600 and yours is at $1,500, a 5% increase to $1,575 is in line with the market and easy to justify. An increase far above market rates risks a vacancy, and a month of empty property usually costs far more than the extra rent would have gained. For tenants, the same market comparison is the best negotiating tool: if the new rent is above comparable homes, that is a concrete argument for a smaller increase or a longer lease at the current rate.

Worked example

Sara rents an apartment for $1,500 a month. Her landlord gives notice of a 5% increase when the lease renews.

Step 1: The monthly increase is $1,500 × 5% = $75.00.
Step 2: Her new rent is $1,500 + $75 = $1,575.00 per month.
Step 3: The extra cost per year is $75 × 12 = $900.00, so her annual rent rises from $18,000 to $18,900.
Step 4: Against an 8% cap (5% + 3% CPI, the California-style example), a 5% increase is within the cap, with 3 percentage points of headroom.

The result: Sara's rent becomes $1,575 a month, $900 more per year. If the landlord had instead asked for $150 more a month, that would be a 10% increase — $1,800 a year extra — and above the 8% example cap, so Sara would have good reason to check whether the cap applies to her home.

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