Free tools
Calculators for the math landlords actually do
Late fees, rent increases, partial months, deposit interest, cash flow: every calculator here shows its work, explains the formula, and walks through a real example. Free to use, no sign-up, results in your browser as you type.
Late Fee Calculator
Flat, percentage, or daily late fees with a grace period: what the fee comes to and the total owed.
Open calculatorRent Increase Calculator
Turn a percentage or dollar increase into the new rent, the difference it makes, and the notice timeline.
Open calculatorProrated Rent Calculator
Move-in and move-out prorations under the actual-day, 30-day, and 365-day methods.
Open calculatorRent-to-Income Calculator
The 3x rule both ways: the income a rent requires, or the rent an income supports.
Open calculatorSecurity Deposit Interest Calculator
Interest owed on a held deposit from the amount, rate, and time, simple or compounded.
Open calculatorRental Property Cash Flow Calculator
Purchase price, financing, rent, and expenses in; cash flow, NOI, cap rate, and cash-on-cash out.
Open calculatorThese tools are for quick, honest math, and each page explains the method behind the number so you can defend it later. They are general information, not legal, tax, or financial advice: rules on late fees, deposits, and rent increases vary by state and city, so check the law where the property sits before you rely on a figure.
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