Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Rent-to-price ratio
0.762%
Rent needed to hit the 1% rule
$3,150
Rent needed for the 2% rule
$6,300
Max price that passes at this rent
$225,000
Gross rent multiplier
10.94
Annual gross rent
$28,800
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter purchase price ($).
- 2Enter rehab budget ($).
- 3Enter expected monthly rent ($).
- 4Read your rent-to-price ratio on the right — it updates as you type.
- 5Hit Share to keep the scenario or send it to someone.
About this calculator
The 1% rule is a screening heuristic, not an analysis. It filters out obvious losers in seconds, but in high-appreciation markets almost nothing passes and the rule stops being useful.
Worked example
Using the values the calculator loads with:
Inputs
- Purchase price: 300000 $
- Rehab budget: 15000 $
- Expected monthly rent: 2400 $
Results
- Rent-to-price ratio: 0.762%
- Rent needed to hit the 1% rule: $3,150.00
- Rent needed for the 2% rule: $6,300.00
- Max price that passes at this rent: $225,000.00
- Gross rent multiplier: 10.94
- Annual gross rent: $28,800.00
What each field means
Inputs
- Purchase price ($)
- The purchase price used in the calculation, measured in $. Starts at 300000 $ so you have a working example on load.
- Rehab budget ($)
- The rehab budget used in the calculation, measured in $. Starts at 15000 $ so you have a working example on load.
- Expected monthly rent ($)
- The expected monthly rent used in the calculation, measured in $. Starts at 2400 $ so you have a working example on load.
Results
- Rent-to-price ratio
- Returned as a percentage and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Rent needed to hit the 1% rule
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Rent needed for the 2% rule
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Max price that passes at this rent
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Gross rent multiplier
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Annual gross rent
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the 1% rule rental screening calculator work?
The 1% rule is a screening heuristic, not an analysis. It filters out obvious losers in seconds, but in high-appreciation markets almost nothing passes and the rule stops being useful. The underlying maths is: Rent-to-price = Monthly rent ÷ Purchase price × 100.
What do I need to enter?
3 values: purchase price, rehab budget, and expected monthly rent. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the rent-to-price ratio result mean?
It is returned as a percentage and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
Who is this tool for?
It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). 1% Rule Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/one-percent-rule
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/one-percent-rule" target="_blank" rel="noopener">1% Rule Calculator — RevenueLab</a> (2026).</p>
Source: [1% Rule Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/one-percent-rule) (2026).