Rental property calculators for real estate investors
Quick math for the numbers real estate investors and rental property owners work out every month. Each calculator runs in your browser, shows the formula it uses and walks through an example.
Prorated rent calculator
Rent for a partial first or last month, by actual days or a 30-day month.
Cap rate calculator
Net operating income as a share of the property's value.
Rental property ROI calculator
One year's total return from cash flow, loan paydown and appreciation.
Cash on cash return calculator
Yearly cash flow as a share of the cash you put in.
NOI calculator
Net operating income and the operating expense ratio for a year.
Rent to income ratio calculator
Rent as a share of gross income, and the income needed at your target.
Late fee calculator
A rent late fee as a flat amount or a percentage, with a grace period.
Security deposit interest calculator
Simple interest on a deposit between two dates at your rate.
Results are estimates for planning only. They are not legal, tax or investment advice, and they apply no state or local rules. Check your lease, your local laws and a qualified professional before you rely on a number.
Run these numbers on your real portfolio
KeyRing pulls transactions from your bank feed and matches rent and expenses to each property, with suggestions you confirm, so the numbers behind these calculators come from what actually happened. Your first subscription starts with a 14-day free trial.