Free Rental Law Calculators
State-specific legal tools for landlords and tenants. All calculators are free, AI-verified, and include legal citations.
Landlord Calculators
Move-In Prorated Rent Calculator
Calculate your first month's prorated rent when starting a new lease mid-month
California Rent Increase Calculator
Calculate maximum legal rent increase under California AB 1482 (5% + CPI cap)
CPI Rent Increase Calculator
Calculate rent increases based on Consumer Price Index (CPI) inflation rates
Security Deposit Calculator by State
Calculate max security deposit, interest requirements, and return deadlines by state
Move-Out Prorated Rent Calculator
Calculate your final month's prorated rent when ending a lease mid-month
Security Deposit Interest Calculator
11 states require landlords to pay interest on deposits. Calculate exact interest owed by state - CT 2%, MA 5%, NJ 7.25%, MD 3%.
Rent Increase Calculator
Calculate new rent after any % increase. Reverse-calculate percentage change. Includes required notice periods and rent control status for all 50 states.
Eviction Cost Calculator
Calculate total eviction costs by state: filing fees ($15-$450), attorney fees, lost rent, and more. Average eviction costs $3,500-$10,000.
Tenant Calculators
Tools to help renters understand affordability and landlord requirements
Rent Affordability Calculator
Use the 30% rule to find how much rent you can afford based on your income
Dog Rent Cost Calculator - United States
Calculate dog rental costs, deposits, and annual fees by state and dog size
Section 8 / Fair Market Rent Calculator
Calculate Section 8 voucher amounts using 2026 HUD Fair Market Rents for 50+ U.S. cities. See HUD's share and your estimated monthly portion.
Educational Guides
In-depth resources for landlords and tenants
First-Time Landlord Late Fee Guide
Complete guide to setting up legal late fee policies for new landlords
NSF Fee Guide (Bounced Check Fees)
State-by-state limits on bounced check fees landlords can charge tenants
Average Pet Rent in the US
Average pet rent costs, pet deposits vs pet fees, and state laws on pet charges
Helpful Guides
Learn more about rental laws with our comprehensive state-by-state guides
Rent Grace Periods by State: Complete Legal Guide (2026)
Understand grace period requirements across all 50 states + DC
Security Deposit Laws by State: 2026 Limits & Deadlines
Complete breakdown of security deposit limits and refund deadlines
New Free Tools: Grace Period & Security Deposit Calculators
Learn how to use our new calculator tools effectively
Need to Calculate Late Fees?
Our main calculator helps you verify late fee compliance with AI-verified state regulations
Automate Your Rent Collection
Stop manually tracking late fees. These free tools automate rent collection and late fee enforcement for your state landlords.
Trusted by your state landlords and tenants alike for compliant rent management.