CPI Ceiling Floor Escalation Calculator

CPI ceilings/floors limit rent shifts. This calculator bounds escalation.

Base rent

CPI actual %

Floor %

Ceiling %

Escalation years

Final year rent

$145,998

Effective bump %

4.00%

Total rent over years

$649,959

How the math works

Bounded = min(ceiling, max(floor, CPI actual)). Final = base × (1+bounded)^years.

On $120k base with 5.5% CPI bounded between 2.5% and 4%: effective 4% (hits ceiling). Year-5 rent: $146k. Lands on ceiling during high inflation — landlord foregoes upside, tenant protected. Symmetric benefit in low-inflation years (floor kicks in).

How to Use

Enter base rent.
Enter CPI actual %.
Enter floor %.
Enter ceiling %.
Enter escalation years.
Read bounded rent path.

Frequently Asked Questions

Why bound?

High-inflation periods: tenants demand ceiling to cap exposure. Low-inflation periods: landlords demand floor to ensure minimum growth. Bounded CPI protects both against regime change. 2021-22 inflation reminded all parties why ceilings matter.

Typical bounds?

Floor: 2-3% (ensures minimum growth). Ceiling: 4-6% (caps inflation spike). Spread of 2-3 points typical. Tight spread (2.5-3.5%): borderline fixed escalator. Wide spread (2-7%): meaningful CPI-linkage.

Base period?

Pick well-defined CPI series (All Urban Consumers, National). Use same monthly reading year-over-year (prevents seasonal distortion). Document base month in lease to avoid ambiguity. CPI-U most common; some use regional (NY, LA).