What is House Hacking Calculator?
The House Hacking Calculator helps you understand how much you can save by renting out part of your home.
When to Use This Calculator
- Deciding whether to buy a duplex or multi-unit property and rent out the other units
- Comparing your net housing cost after rental income against renting an apartment yourself
- Estimating how much of your mortgage a roommate or ADU tenant could offset
- Planning the first step of a real estate investing strategy that starts with owner-occupied financing
- Evaluating whether house hacking lets you qualify for a property you couldn't otherwise afford
- Projecting how your housing cost changes if you move out and rent your own unit later
Steps:
- Enter mortgage and rental income.
- Input traditional rent for comparison.
- View net cost and savings.
Formula
Net Housing Cost = Monthly Mortgage − Rental Income
Monthly Savings = Traditional Rent − Net Housing Cost
Annual Savings = Monthly Savings × 12
Savings Percentage = (Monthly Savings / Traditional Rent) × 100
A positive savings percentage means you're living below market rent.
Use Cases
- House hacking analysis
- Real estate planning
- Cost reduction
Key Benefits
- Get accurate house hacking calculator results instantly
- Save time with house hacking calculator calculations
- Make informed decisions with clear data
- Free on any device no downloads
Pro Tips
- Double-check inputs for accuracy
- Run multiple scenarios
- Combine with other tools
Common Mistakes to Avoid
- Using inaccurate inputs
- Ignoring key factors
- Misinterpreting outputs
Key Terms Explained
- Input: Values you provide
- Output: Results computed
- Formula: Method used
- Result: Calculated answer
Related Concepts
- Rental Property Cash Flow: Once you move out of a house-hacked property, its economics shift to a standard rental analysis — run the full numbers with our rental property calculator to see what it looks like as a pure investment.
- Rent vs Buy: House hacking is really a specific answer to the broader rent-vs-buy question — you're buying, but letting tenants offset the cost. Compare it against a straightforward rent-vs-buy scenario with our rent vs buy calculator.
- Mortgage Payment Sizing: Your net housing cost depends heavily on the size of your mortgage payment, which depends on your down payment, rate, and term. Model different scenarios with our mortgage calculator before deciding how much to put down.
- Cash-on-Cash Return: If you eventually convert a house-hacked property into a full rental (by moving out), its cash-on-cash return becomes a relevant metric for judging its ongoing performance as an investment — check it with our cash-on-cash return calculator.
- Cash Flow Forecasting: Rental income from roommates or other units can fluctuate with turnover — project a full year (or several) of income and expenses with our cash flow forecast calculator to see how vacancy between tenants affects your net cost.
Example
With $2K mortgage, $1.2K rental income, and $1.5K traditional rent, you save $700/month.
Interpreting Your Results
House hacking reduces your net housing cost by using rental income from the other units (or rooms) in your property to offset your mortgage payment — the calculator's "net cost" is what you're actually paying to live there after that income is applied. A positive net cost still below typical local rent means you're living for less than you would renting alone; a net cost near or below zero means your tenants are covering all or most of your housing payment. The bigger long-term advantage is financing: owner-occupied loans (like FHA, with down payments as low as 3.5%) are only available if you live in one unit, so house hacking can let you buy a property you couldn't qualify for as a pure investment purchase. Compare the annual savings shown here against what you'd pay in rent for equivalent housing — that gap is the real value of the strategy, on top of any equity and appreciation you build by owning instead of renting.