The Best Rent vs Buy Calculators Compared: Which One Should You Use?

Costs & MathBy RentBuyAtlas Editorial TeamUpdated 7 November 20267 min read

What is the best rent vs buy calculator?

The best rent vs buy calculator is the one that models opportunity cost, transaction costs and a time horizon you choose, using assumptions that fit your market. In the US, The New York Times, NerdWallet and SmartAsset calculators are the most detailed, with full tax modelling. Fidelity’s is the quickest. If you live outside the US, a tool with local costs and currencies, such as our own RentBuyAtlas calculator, will give a far more relevant answer.

We built RentBuyAtlas, so read this comparison with that in mind. We have tried to describe each tool fairly, based on what its own pages say as of November 2026. Where we could not check a feature directly, we say so.

How we compared the calculators

We looked at the questions that decide whether a calculator’s verdict is trustworthy:

• Does it count the opportunity cost of the deposit and of monthly cost differences?
• Does it include buying and selling costs, not just the monthly payment?
• Can you choose the time horizon?
• Does it show a break-even answer (years or rent)?
• Does it model taxes, and for which country?
• Can you change every assumption, or are some fixed?

The calculators, one by one

The New York Times rent vs buy calculator

The New York Times Upshot calculator (“Is It Better to Rent or Buy?”) has been a reference point since its 2014 redesign, and it was later updated to reflect the 2017 US tax law changes to the mortgage interest deduction. Its signature output is an equivalent rent: it tells you that if you can rent a similar home for less than a stated monthly amount, renting is the better financial choice.

Inputs cover home price, how long you will stay, mortgage rate and down payment, expected home price growth, rent growth, investment return and inflation, plus closing costs, maintenance, property tax and your marginal tax rate. Unusually, it also includes renter-side costs such as a broker’s fee and security deposit. We could not load the page directly for this review, so treat feature details as based on published descriptions; access may depend on your subscription.

Best for: US users who want a rigorous, tax-aware answer framed as a rent threshold.

NerdWallet rent vs buy calculator

NerdWallet’s calculator asks for rent and optional renter costs (security deposit, renter’s insurance, broker fee, rent increase), then home price, down payment, rate, 15- or 30-year term, closing costs, property tax, insurance, HOA, utilities, maintenance, selling costs, appreciation and PMI. A tax and investing section covers filing status, marginal tax rate, capital gains tax, rate of return and inflation, with a stay-length slider from 1 to 30 years.

Outputs include which option costs less, a break-even year, total inflation-adjusted cost of each, and a line-item breakdown that includes opportunity cost and tax savings. NerdWallet states that it assumes buyers itemize deductions for property tax and mortgage interest, which will flatter buying for the many US households who take the standard deduction.

Best for: US users who want detailed line items and a clear break-even year.

Zillow rent vs buy calculator

Zillow’s rent vs buy calculator focuses on the breakeven horizon, the number of years you need to stay for buying to cost less than renting. Zillow Research publishes metro-level breakeven estimates; its June 2026 release said the typical US buyer breaks even in about six years, down from a peak of 8.4 years in October 2023. We could not load the calculator itself for this review, so we cannot confirm its current inputs; third-party reviews describe it as quick and simple rather than exhaustive.

Best for: a fast US sense-check, especially alongside Zillow listings.

Fidelity rent vs buy calculator

Fidelity’s rent vs buy calculator asks very little: household income, current rent, the most you would spend on a home, savings set aside and how long you will stay. Advanced fields let you change the investment return (default 6%), mortgage rate and appreciation (default 4%).

Everything else is fixed, according to Fidelity’s stated assumptions: a 30-year fixed loan, buying costs of 2%, selling costs of 7%, property tax of 1.15%, insurance of 0.35%, maintenance of 0.50%, rent growth of 2.5%, PMI below 20% down, and a 20% capital gains rate. It reports short-term monthly costs and long-term net wealth, and calls the result a tie when the gap is under 10%.

Best for: a quick wealth comparison when you do not want to research every input.

SmartAsset rent or buy calculator

SmartAsset’s calculator starts with your location, which it uses to estimate property taxes, home prices and closing costs. It takes rent and rent growth, home price, down payment, mortgage type (30-year, 15-year or 5/1 ARM), income and marital status for tax estimates, ownership costs, appreciation, inflation and return on savings.

It produces a year-by-year cost comparison, a break-even year, and a breakdown including tax savings and lost interest income. Its tax engine estimates federal, state and local taxes and notes that the mortgage interest deduction only helps if you itemize.

Best for: US users who want location-aware tax and cost estimates.

Realtor.com and Trulia

People often search for a realtor.com or Trulia rent vs buy calculator. Trulia launched a calculator in 2013 that took a zip code, target rent, home price and down payment and showed a breakeven point and 10-year costs, and Trulia published regular rent vs buy research for several years after. We could not confirm that either Realtor.com or Trulia currently offers a dedicated rent vs buy calculator, so if you find one, run it through the checklist below before relying on it.

RentBuyAtlas

Our rent vs buy calculator runs a month-by-month simulation for any horizon from 1 to 30 years. It starts from local defaults for countries and cities worldwide, in local currency, including transfer taxes and fees (for example, the 4% Dubai Land Department fee, German Kaufnebenkosten, or Spanish ITP), service charges and typical mortgage terms. Every input is editable.

Outputs include net worth of buyer and renter each year, a break-even year, a break-even rent, monthly payment, total unrecoverable costs and a 5% rule check. A shared ownership mode handles the UK part-buy, part-rent scheme, and every result can be shared by URL.

Its limits: it does not model tax deductions, mortgage insurance or rate resets, and it does not pull live local listings. You enter those effects yourself where they apply.

Best for: anyone outside the US, people comparing countries, and anyone who wants to share a scenario.

Rent vs buy calculator comparison table

“Not confirmed” means we could not verify the feature from the tool’s own page at the time of writing, not that it is absent.

What to look for in a rent vs buy calculator

Use this checklist on any tool, including ours:

1. Opportunity cost is included. The renter should be credited with investing the deposit and buying costs. Without this, buying almost always “wins.” Our guide to the opportunity cost of a down payment shows how big this is.
2. Transaction costs are realistic for your country. A 3% buying cost is fine in parts of the US but far too low for Germany (around 10%) or Spain (around 11%).
3. You set the horizon. Short stays favour renting because buying and selling costs are paid only once. See our break-even point explainer.
4. Maintenance and service charges are counted. Around 1% of value a year is a common starting point for houses.
5. The output is net worth, not monthly payment. Comparing mortgage to rent alone ignores equity, costs and investment growth.
6. Defaults are visible and editable, especially home appreciation and investment return.
7. Tax treatment matches your situation. US tools that assume itemizing can overstate the benefit of buying.
8. You can stress-test. Try 0–1% appreciation and a lower return, and see if the verdict survives.

Which calculator should you use?

• US, want maximum detail: The New York Times or NerdWallet.
• US, want location-based tax estimates: SmartAsset.
• US, want a two-minute answer: Fidelity or Zillow.
• Outside the US, or comparing countries: RentBuyAtlas, starting from your market in the country hub.

Whichever you use, run the same scenario in two tools. If they agree, you can be confident in the direction. If they disagree, the difference will usually point to the assumption that matters most for you. This is general information, not financial advice.

Run your own numbers

Every rule of thumb above depends on your rent, price, rate and how long you stay. Use the Rent vs Buy Calculator below — it starts with local defaults you can change.