Rent vs. buy calculator guide
Renting and buying involve different cash flows, risks, and flexibility. A useful comparison includes more than rent versus mortgage payment: it also considers down payment, transaction costs, taxes, insurance, maintenance, equity, and the opportunity cost of cash.
The result is a scenario, not a forecast. Appreciation, investment returns, repairs, rent growth, and how long you stay can change the conclusion.
How to use the rent vs buy calculator
- Enter comparable home and rent: Compare housing options that meet similar needs.
- Add financing and ownership costs: Include taxes, insurance, maintenance, and transaction costs.
- Set a realistic time horizon: Use how long you may actually remain.
- Stress-test growth assumptions: Try conservative appreciation and investment returns.
Formula and variables
The calculator applies the entered housing, financing, and cost assumptions consistently.
Net buy cost = ownership outflows − sale proceeds + down-payment opportunity cost- Sale proceeds — Future value less selling costs and loan balance
- Estimated equity recovered at sale.
- Horizon — Years in the home
- Determines how long costs and growth compound.
Worked example: transaction costs need time
A renter compares $2,000 rent with a $350,000 home over 10 years.
- Down payment
- 20%
- Add ownership cash outflows.
- Estimate future loan balance and sale proceeds.
- Compare rent and opportunity cost.
Result: The lower modeled cost depends on assumptions
Short horizons often make transaction costs more important.
Understanding your results
Lower modeled net cost
Scenario with lower estimated net housing cost.
Difference
Magnitude, not certainty, of the modeled gap.
Assumptions
- Fixed mortgage and constant annual growth rates.
- Sale occurs at the end of the entered horizon.
Limitations
- Tax deductions, PMI, HOA, moving, and irregular repairs may be incomplete.
- Future prices and returns are unknown.
Common mistakes
- Comparing unlike homes.
- Ignoring selling costs.
- Using optimistic appreciation as certainty.
- Ignoring flexibility and maintenance responsibility.
Practical use cases
Compare housing scenarios
Change one assumption at a time to identify the factors driving the result.
Plan before committing
Use estimates to prepare questions and budgets, not as a guarantee.
Planning and decision guide
Time horizon is often decisive
Buying costs are front-loaded and selling costs reduce recovered equity.
Compare lifestyle and risk too
Mobility, maintenance responsibility, payment stability, and local supply matter.
Use ranges, not one forecast
Test low, middle, and high rent growth, appreciation, and repair costs.
Frequently asked questions
Is buying always better than renting?
No. Location, price, rent, financing, costs, horizon, and personal needs determine the tradeoff.
Does mortgage principal count as a cost?
Principal builds equity, so this model tracks the remaining balance and sale proceeds.
Why include opportunity cost?
A renter may retain cash that a buyer commits to down payment and closing.
What is the break-even point?
It is when modeled net costs are equal, but it changes with assumptions.
Sources and review
- Buying a house — Consumer Financial Protection Bureau. Accessed 2026-07-10.
Reviewed 2026-07-10.