House Hacking Calculator
Estimate how much of a mortgage is covered by rental income after vacancy and maintenance reserves.
House Hacking Offset Calculator
See how much of your mortgage is covered by rental units
Combined PITI used below: $2,500/mo.
Water, trash, lawn, extra insurance you still pay. Added to net housing cost. Leave 0 if tenants pay all utilities.
Strategy Overview
Instead of paying $2,500, you only pay $970 because your tenants cover the rest.
Accounting for Gross vs Net: Simply subtracting rent from mortgage is risky. This tool accounts for a 15% reserve for repairs and empty units. Planning estimate, not a lender or tax calculation.
What is a house hacking calculator?
A house hacking calculator is a tool that estimates how much of a mortgage is covered when you live in one unit of a duplex, triplex, or fourplex and rent the others. Enter PITI, rent, vacancy, and maintenance reserves — this page does not underwrite a loan or find tenants.
This is an estimate from the numbers you enter — not investment, tax, or lending advice. Owner-occupied financing and rental income are not guaranteed.
How to Use the House Hacking Calculator
- Enter your mortgage details. Input the purchase price, down payment, interest rate, and loan term to calculate your monthly PITI (principal, interest, taxes, insurance) payment.
- Enter rental income from other units. Input the expected monthly rent for each unit you plan to rent out. Do not count the unit you will occupy.
- Set vacancy and maintenance reserves. Standard vacancy reserve is 5–10% of gross rent; maintenance and CapEx reserve is 10–15%. These convert gross rental income into a realistic net figure.
- Review your net monthly housing cost. The calculator subtracts net rental income from your mortgage payment. A result at or below $0 means your tenants are covering your housing cost entirely.
Who Is This For?
- First-time home buyers considering house hacking as an entry into real estate investing — wanting to see the actual numbers before committing to a multi-unit purchase.
- People trying to reduce their housing cost in expensive cities, comparing what they'd pay in rent vs. what they'd net after house hacking a duplex or triplex.
- Anyone who wants to model whether a specific property at a specific purchase price makes house hacking financially viable before making an offer.
Key Benefits
- Privacy. Tool inputs stay in the browser.
- Free to use now. No account, no paywall. Ads are not live yet.
- No account needed. Works instantly — no sign-up to run your analysis.
- Accounts for real-world vacancy and maintenance. Unlike a simple rent-minus-mortgage estimate, this calculator builds in the reserves that separate profitable house hackers from those who get caught off guard by a vacancy or repair bill.
The Near-Zero Housing-Cost Milestone
If your modeled Net Housing Cost is $0 or negative under the numbers you enter, tenants cover the full mortgage payment in that scenario — while you still build equity. Vacancy, repairs, and financing can change the real result.
Common Use Cases
A buyer in a high-cost city can't afford a single-family home but finds a duplex within budget. They model the rental income from the second unit with 8% vacancy and 12% maintenance reserves. The result: their effective monthly housing cost drops from $2,800 to $900 — cheaper than their current rent.
A first-time investor uses FHA financing (3.5% down) on a triplex. They model all three units: their own unit costs them nothing, and the two rental units generate enough net income to cover the full PITI with a small monthly surplus.
Someone weighing rent vs. house hacking uses the calculator to compare: $2,200/month in rent vs. owning a duplex with a $3,000 PITI and $1,400/month in net rental income — effectively paying $1,600/month to own an appreciating asset instead of $2,200 to rent.
FHA loans require a minimum 3.5% down payment for borrowers with credit scores of 580 or higher (FHA.gov). The conventional minimum for investment properties is typically 15-25% down. For full program details, see HUD.gov — FHA Loan Programs.
3 Pro Tips for Successful House Hacking
- Look for "by-the-room" opportunities. In expensive cities, renting out individual rooms in a large single-family home can generate more revenue than a traditional duplex arrangement.
- Analyze the exit strategy before you buy. Use the Investment Property Calculator to see how the property performs as a fully rented investment once you move out of your unit.
- Manage your own units at first. Learning to screen tenants and handle minor repairs early saves thousands in property management fees as your portfolio grows.
Frequently Asked Questions
What is house hacking? ▼
House hacking is a real estate strategy where you buy a multi-unit property — typically a duplex, triplex, or fourplex — live in one unit, and rent out the others to reduce or eliminate your housing cost. It is one of the most accessible entry points into real estate investing because owner-occupied financing (FHA, conventional) requires far less down payment than a pure investment property loan — as low as 3.5% with FHA on a 2-4 unit property.
Is this calculator free? ▼
Yes. This House Hacking Calculator is free to use now — ads are not live yet — with no account required. Tool inputs stay in your browser. The site uses aggregate Google Analytics.
Does house hacking qualify for owner-occupied financing? ▼
Yes. FHA loans allow as little as 3.5% down on 2-4 unit properties if you live in one unit. Conventional loans can go as low as 5% down for owner-occupied multi-family properties. This is a key advantage over investment property loans, which typically require 20-25% down — house hacking dramatically lowers the barrier to entry for first-time investors.
How do I calculate if house hacking makes financial sense? ▼
Compare your total PITI payment against the net rental income from the other units after accounting for vacancy (5-8%) and maintenance reserves (10-15%). If rental income covers 75-100% of your PITI under those assumptions, you are living at a steep discount. If it exceeds your PITI, your modeled net housing cost can reach $0 or less. This calculator estimates that comparison from the numbers you enter — a planning estimate with vacancy and maintenance reserves, not a guaranteed outcome.
What property types work best for house hacking? ▼
Duplexes, triplexes, and fourplexes are the classic house hacking properties because they have multiple rentable units while still qualifying for residential owner-occupied financing. Single-family homes with an ADU or finished basement work well in high-cost cities. Some investors rent out individual rooms in a large single-family home, which can generate more income per square foot than a traditional duplex in certain markets.
What happens when I move out of my house-hacked property? ▼
Once you move out, you can rent your former unit to a new tenant, converting the property to a fully occupied rental. Most owner-occupied loan programs require you to live in the property for at least one year before converting it. After moving out, run the numbers through an investment property calculator to confirm the deal still makes sense as a pure rental at market rent for your unit.
This tool is provided for informational and educational purposes only. Results are not a substitute for professional advice.
Free Tools Alert
Get new tools, templates, and calculators in your inbox. No fake subscriber counts.
No spam. One-click unsubscribe.