Housing · An educational calculator
Explore the rent math.
Compare an illustrative adjustment under the June 10 draft with an increase you select. See the monthly difference and how constant rates compound over five years.
Historical draft illustration. This tool uses the June 10, 2026 proposal. It does not determine your legal rent increase or predict future rents. Check current City information.
Enable JavaScript to calculate the comparison. For example, 1.8% of $3,000 is $54.
One-year illustration
June 10 draft formula
Monthly rent after one adjustment
- Illustrative adjustment
- Additional rent per month
- Additional rent over 12 months
Your selected comparison
Monthly rent after one adjustment
- Selected increase
- Additional rent per month
- Additional rent over 12 months
The increase is assumed to begin at the start of year one and apply for all 12 months. Both scenarios use the full selected adjustment. A permitted maximum does not mean an owner will charge it.
Rent and selected fee as a share of income
Gross household income is held constant. Utilities and other housing costs are excluded.
- Starting rent
- Draft illustration, including selected fee
- Selected comparison
Optional: five years at these same rates
Five annual adjustments, with the first at the start of year one. CPI and the comparison rate stay constant; each full adjustment is applied. These are hypothetical paths for the same starting rent, not forecasts of market rents or the cost of moving.
Draft illustration
- Monthly rent after adjustment five
- Total rent paid across five years
Selected comparison
- Monthly rent after adjustment five
- Total rent paid across five years
How the calculation works and what it leaves out
The June 10 draft rounds the CPI percentage change to the nearest quarter percentage point, then applies 60%, subject to a 3% ceiling and a 0% floor. With assumed CPI of 3%, the illustrative adjustment is 1.8%. On $3,000, that adds $54 a month.
For compounding, monthly rent after adjustment n equals starting rent × (1 + annual rate)n. The five-year rent total sums 12 months at each of the five adjusted rents. Amounts are rounded for display; calculations retain full precision.
Coverage, base-rent rules, earlier increases, notice requirements, and special adjustments can affect actual allowable rent. The draft also includes a fair-return petition process. This simplified tool does not model those legal determinations.
Different percentage growth rates for rent and expenses do not establish maintenance capacity or profitability. Those questions require starting dollar amounts and a fuller operating analysis. This calculator also does not predict rental supply, displacement, or homelessness.
Prepared September 7, 2026. The optional fee is a visitor-selected assumption. The proposed displacement-prevention pilot elsewhere on this page has a separate purpose and budget.