Rent Increase Projection Calculator
Project how your rent will increase over the years.
See future monthly rent, cumulative cost, and total paid at different increase rates.
Legal rent increase percentage calculation requires understanding both the mathematical formula for percentage increases and the jurisdiction-specific legal caps that limit how much a landlord can raise rent in any given period.
New rent after increase formula: New Rent = Current Rent × (1 + Increase Rate)
Increase percentage from old and new rent: Increase % = ((New Rent − Old Rent) ÷ Old Rent) × 100
Rent control caps — key approaches by jurisdiction:
CPI-based limits (most common): Many cities cap rent increases at local Consumer Price Index (CPI) inflation, typically 3–8% annually. Max Increase = CPI% (or CPI% + fixed buffer, e.g. CPI + 5%)
California AB 1482 (statewide, 2020+): Max increase = lower of (CPI + 5%) or 10% per year. Local rent control ordinances (Los Angeles, San Francisco, Oakland) often set lower caps (3–4%).
Oregon statewide (2019+): Max increase = CPI + 7%, not to exceed 10%.
New York City: Rent Stabilized apartments: 1-year lease ~3%, 2-year lease ~2.75% (set annually by Rent Guidelines Board — varies each year).
Required notice periods:
- Less than 10% increase: typically 30 days notice
- 10% or more increase (where allowed): typically 60–90 days notice
- Always check local landlord-tenant law — varies significantly by state and city
Cumulative increases — compound effect: Rent After N Years = Initial Rent × (1 + Annual Rate)^N
A 5% annual increase compounding for 5 years: Initial Rent × (1.05)^5 = Initial Rent × 1.276 (27.6% total increase)
Worked example: Current rent: $1,800/month. Local CPI: 4.2%. Jurisdiction allows CPI + 2% or 8% maximum.
- Allowable increase: min(4.2% + 2%, 8%) = min(6.2%, 8%) = 6.2%
- New rent: $1,800 × 1.062 = $1,911.60/month
- Increase in dollars: $111.60/month = $1,339.20/year
- Notice required: 30 days (less than 10% increase)
- In 5 years at same rate: $1,800 × (1.062)^5 = $1,800 × 1.352 = $2,434/month
Always verify your local rent control ordinance before issuing any increase notice — violations can result in tenant rights claims and required rent reductions.