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Mortgage Affordability Calculator
Mortgage affordability
Estimate affordability from income and debt.
On this page (tap to expand)
Quick answer: Mortgage Affordability Calculator
Back-of-envelope max loan from income, debts, down payment, rate, and typical lender ratios.
Example: $7,200/mo gross, $620 other minimums, 20% down, 6.25% on 30yr → might land near a $410k loan ballpark before taxes/HOA specifics bite.
Calculations follow the documented formula on this page; rounding and input units can change the last digit—treat outputs as educational estimates unless you reconcile with source systems.
* This is an estimate. Actual amounts may vary slightly based on input assumptions.
What this calculator does
- Mortgage Affordability Calculator
- Find affordable mortgage amount.
Lenders cap housing payment (PITI) around 28–36% of gross depending on program - this mirrors that sniff test before you fall in love with a listing.
Estimate affordability from income and debt.
Inputs on this page: Monthly Income, Monthly Debt, Max DTI (%). Assumptions stay visible so you can reproduce the figure elsewhere.
When to use it
- Use Mortgage Affordability Calculator when you need a transparent mortgage affordability answer before you commit numbers to a spreadsheet, invoice, or conversation.
- Reach for it when you already know (or can estimate) Monthly Income and want the dependent result without rebuilding the formula by hand.
- Skip it when you need certified advice, signed-off payroll, or a lender’s official quote—those require the primary institution’s systems.
Key takeaways
- HOA and PMI aren’t optional extras in real affordability - bake them in.
- Self-employed income needs averaging; side gigs may not count full freight.
- Rate locks expire; re-run if quotes drift a quarter point.
How to use this tool
- 1Enter your values into the fields.
- 2Click calculate or convert.
- 3Copy or use the result instantly.
Guides and explainers
Long-form walkthroughs that pair well with this calculator. When you need narrative context beyond the live fields, start here and return to the tool to plug in your own numbers.
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Practical scenarios
People who care about mortgage affordability use Mortgage Affordability Calculator as a planning sandbox: HOA and PMI aren’t optional extras in real affordability - bake them in.
Continue in the Real estate tools collection or the glossary. Related calculators in this session: Loan Calculator, Rent vs Buy Calculator, Rental Yield Calculator UK, Stamp Duty Calculator UK, Property ROI Calculator, Mortgage Affordability Calculator USA.
Related definitions
Key formula explained
How the calculation works
The Formula
The result is calculated using standard industry formulas and validated input ranges.- Monthly Income: the value you enter for income.
- Monthly Debt: the value you enter for debt.
- Max DTI (%): the value you enter for ratio.
| This tool | The result is calculated using standard industry formulas and validated input ranges. |
|---|---|
| Related intent: mortgage affordability | See paired tools for mortgage affordability-each page documents its own core relationship next to the live form. |
Core relationship for Mortgage Affordability Calculator:
The result is calculated using standard industry formulas and validated input ranges.
Worked check: $7,200/mo gross, $620 other minimums, 20% down, 6.25% on 30yr → might land near a $410k loan ballpark before taxes/HOA specifics bite.
Related calculations
Keep the same assumptions and open a neighbor calculator when your question branches: Loan Calculator, Rent vs Buy Calculator, Rental Yield Calculator UK, Stamp Duty Calculator UK. Each page documents its own formula beside the fields.
Learning links: Methodology · Editorial policy · Glossary
Worked real-world example
$7,200/mo gross, $620 other minimums, 20% down, 6.25% on 30yr → might land near a $410k loan ballpark before taxes/HOA specifics bite.
Re-enter the same numbers in the calculator above to confirm the page math matches the interactive result.
Who uses this tool?
People who care about mortgage affordability use Mortgage Affordability Calculator as a planning sandbox: HOA and PMI aren’t optional extras in real affordability - bake them in.
Common mistakes
- For Mortgage Affordability Calculator, mismatched units or periods (monthly vs annual, % vs decimal) are the fastest path to a believable wrong answer on mortgage affordability.
- Watch for this pitfall: Self-employed income needs averaging; side gigs may not count full freight.
- If you paste the result into a decision doc, note the formula and the page date (2026-07-18) so teammates can reproduce it.
References & sources
Official references for context. Calculator outputs are planning estimates—confirm material decisions with the primary authority or a qualified professional. See our methodology and editorial policy.
- Toollabz methodology — How we document formulas and update pages
- CFPB — Buying a house
- UK Land Registry guidance
Content last updated 2026-07-18
FAQs
Click a question to expand the answer.
Is the Mortgage Affordability Calculator free to use?
Yes, the Mortgage Affordability Calculator is completely free with no hidden limits.
Can I use Mortgage Affordability Calculator on mobile?
Yes. All tools are optimized for desktop, tablet, and mobile devices.
What does Mortgage Affordability Calculator calculate in plain English?
Back-of-envelope max loan from income, debts, down payment, rate, and typical lender ratios.
Can you show a worked example for Mortgage Affordability Calculator?
$7,200/mo gross, $620 other minimums, 20% down, 6.25% on 30yr → might land near a $410k loan ballpark before taxes/HOA specifics bite.
What are the most important tips when using Mortgage Affordability Calculator?
HOA and PMI aren’t optional extras in real affordability - bake them in. Self-employed income needs averaging; side gigs may not count full freight. Rate locks expire; re-run if quotes drift a quarter point.
How does Mortgage Affordability Calculator arrive at the result?
Lenders cap housing payment (PITI) around 28–36% of gross depending on program - this mirrors that sniff test before you fall in love with a listing. Formula reference: The result is calculated using standard industry formulas and validated input ranges.
Is Mortgage Affordability Calculator a substitute for professional advice on mortgage affordability?
No. Treat this as a planning estimate. Confirm material decisions with HMRC, the IRS, a licensed adviser, or a clinician as appropriate.
Next step
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Built and maintained by Imtiaz Ahmad
Founder and lead engineer | Content updated July 18, 2026
See methodology and editorial policy.