Massachusetts Rental Calculators & Landlord-Tenant Tools
Free Massachusetts rental calculators and landlord-tenant tools — everything you need to verify deposits, check fees, and protect your rights under Massachusetts law.
Massachusetts Security Deposit Interest Calculator
Calculate the interest your landlord legally owes you on your security deposit under Massachusetts law.
Interest required (accrues dynamically)Massachusetts Late Fee Calculator
Verify if your landlord's late fees violate Massachusetts grace periods or statutory caps.
30-day grace period & capMassachusetts Break Lease Fee Calculator
Estimate your financial exposure and check the landlord's duty to mitigate under Massachusetts law.
Landlord must mitigate damagesMassachusetts Security Deposit Limits
Check if your deposit exceeds Massachusetts legal caps and track your return deadlines.
Max 1 month rent & 30-day returnMassachusetts Rent Increase Calculator
Check if your rent increase is legal and review local rent stabilization guidelines in Massachusetts.
No statewide capMassachusetts Rent Calculator
Calculate prorated rent for a mid-month move-in or move-out in Massachusetts.
Free prorated rent toolGeneral Massachusetts Tenant Guide
Tenant laws in Massachusetts protect you from landlord overcharges, illegal deductions, and unmitigated lease break penalties. If you find a violation using our tools above, you can use our Demand Letters to write a formal legal notification to your landlord.
Neighboring State Rental Tools
Explore landlord-tenant tools for states near Massachusetts.