To find a new rent, multiply the current rent by one plus the increase as a decimal. A $1,500 rent raised 3% becomes $1,500 × 1.03 = $1,545, an extra $45 a month or $540 a year. Going the other way, a rise from $1,200 to $1,300 is an 8.33% increase.
Tenants reading a renewal letter and landlords drafting one both need the same two numbers: how much the rent goes up in dollars and what that is as a percentage. Many local rent-stabilisation rules are written as a percentage cap, while the letter usually states only a new dollar figure. This calculator works in both directions. Enter the current monthly rent, then either the percentage increase or the proposed new rent, and it returns the new monthly rent, the change per month and per year, the percentage change and the new yearly total, with the arithmetic written out. It flags rises above 10%. It does not know the legal cap, notice period or exemptions that apply to a particular property; those depend on the city, state or country.
Type the monthly rent paid today, before any increase.
Pick A percentage if you know the rate, or A new rent amount if the notice states a dollar figure.
Fill in the percentage or the proposed monthly rent; the results update as you type.
Compare the percentage change with any local cap and check the yearly difference against your budget.
Result New monthly rent: $1,545.00
Change per month: $45.00
Change per year: $540.00
Percentage change: 3%
New rent per year: $18,540.00
A 3% rise adds $45 a month, which is $540 over a twelve-month lease.
Result New monthly rent: $1,300.00
Change per month: $100.00
Change per year: $1,200.00
Percentage change: 8.33%
New rent per year: $15,600.00
A $100 jump on $1,200 is an 8.33% increase, close to the limits some rent-stabilised areas apply.
Result New monthly rent: $2,240.00
Change per month: $240.00
Change per year: $2,880.00
Percentage change: 12%
New rent per year: $26,880.00
A 12% rise adds $240 a month and passes the 10% line many local caps use, so the tool flags it.
New rent = R × (1 + p ÷ 100); p = (N − R) ÷ R × 100
RNpA rent increase is a plain percentage change measured against the current rent, not against the new one. The monthly difference is N minus R, and the yearly difference multiplies that by 12 months. A negative percentage gives a rent reduction. Caps in rent-stabilisation laws are usually expressed in this same form, sometimes tied to inflation as measured by the Consumer Price Index.
Subtract the current rent from the new rent, divide by the current rent and multiply by 100. Going from $1,200 to $1,300 is a $100 change, and 100 ÷ 1,200 × 100 = 8.33%.
It varies widely by market and year. Many landlords track inflation, and the U.S. Bureau of Labor Statistics publishes the shelter and rent components of the Consumer Price Index, which give a reference point for how fast rents are rising nationally.
In some places, yes. Several US states and cities, and other countries, cap annual increases for certain units, often as a fixed percentage or inflation plus a margin. Many areas have no cap. Check the housing authority for the property's location.
Ten percent is a ceiling that appears in several stabilisation laws, so a rise past it is worth checking against local rules. The warning is a prompt to look, not a statement that the increase is unlawful.
Yes. Enter a negative percentage, or a proposed rent below the current one. The changes show as negative numbers and the tool notes that it is a decrease.
The Change per year figure multiplies the monthly difference by 12. A $45 monthly rise costs $540 across a twelve-month lease, before any other fees.