DealMathIQ
Free · No signup · Built for investors
Sharp calculators for real estate investors
Stop wrestling with blog spreadsheets and bloated "free" tools that lock the good stuff behind a paywall. Fourteen focused calculators built for the deals you actually do.
Deal analysis
5 toolsBRRRR Calculator
See cash recovered, cash left in deal, and ongoing returns on a Buy-Rehab-Rent-Refinance-Repeat play.
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Rental ROI Calculator
Full deal analyzer with cash flow, cap rate, cash-on-cash, and 5-year total return.
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70% Rule Calculator
Maximum allowable offer for fix-and-flip deals. The bedrock screening rule.
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Multi-Unit Calculator
Duplex, triplex, fourplex analyzer with unit-by-unit rent inputs.
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House Hacking Calculator
Live for free with tenants offsetting your mortgage. Compares to renting.
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Key metrics
4 toolsCash-on-Cash Return
The real annual return on the cash you actually invested.
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Cap Rate Calculator
Unleveraged property yield + implied value at any target cap rate.
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Appreciation & Total ROI
Project full ROI over 5-30 years: appreciation + paydown + cash flow.
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Landlord Expense Calculator
60-second deal screen using the 1% rule, 50% rule, and detailed expenses.
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Financing
3 toolsHard Money Loan Calculator
True cost of fix-and-flip financing including points, fees, and effective APR.
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Refinance Calculator
Monthly savings, break-even months, and lifetime impact of refinancing.
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HELOC Calculator
Maximum line based on home equity + draw vs repayment phase payments.
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Strategy
2 toolsAirbnb vs Long-Term Rental
Side-by-side STR vs LTR profit comparison with full expense modeling.
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1031 Exchange Calculator
Capital gains tax + depreciation recapture you defer with a 1031.
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Why DealMath
Built differently
Most real estate calculators online are blog plugins designed to keep you on the page so they can sell ads. DealMath does three things they don't:
Honest math
Every calculation is verified against industry-standard formulas. No vendor numbers, no inflated assumptions to make their products look better.
Worked examples
Each tool comes with a full worked example using realistic numbers. See the formula, the inputs, and exactly how to apply it.
Plain-English verdicts
Every result includes a one-line interpretation — "strong BRRRR" or "thin margin" — not just a wall of numbers you have to figure out yourself.
How to use these tools
Most investors run the same flow:
- Step 1 — Screen quickly. Use the Landlord Expense Calculator for a 60-second 1%/50% rule check. Most deals fail here. Don't fall in love.
- Step 2 — Analyze deeply. Run the surviving deals through the Rental ROI Calculator or, for value-add plays, the BRRRR Calculator.
- Step 3 — Verify financing. Use the Hard Money or Refinance calculators to confirm the financing piece pencils.
- Step 4 — Plan the exit. Use the Appreciation ROI Calculator for long-term holds and the 1031 Exchange Calculator for sale planning.
Built by investors for investors. No accounts, no email captures, no upsells.