Embed DealMath calculators on your site

Free, mobile-responsive calculators your readers can use without leaving your page. One line of HTML, no setup, no JavaScript dependencies. Asks only for a small "Powered by DealMath" link, which we can move to a tooltip if you'd prefer.

How it works

Pick a calculator below.
Click Show live preview to see exactly how it will render inside your page.
Click Copy snippet and paste the iframe into your HTML. That's it.

Default snippet

Each card below has a one-click Copy that includes the right slug. If you'd rather grab the template:

<iframe
  src="https://dealmath.app/SLUG?embed=true"
  width="100%"
  height="900"
  style="border:0;border-radius:8px"
  loading="lazy"
  title="Powered by DealMath"
></iframe>

The iframe handles all interactivity, mobile responsiveness, and URL state. If your readers want to share their analysis, they can click the share button inside the iframe and get a clean URL with a preview image.

Available calculators (15)

Click Show live preview on any calculator to see it rendered exactly as your readers will see it.

Rental Property Calculatorrental-calculator
Full rental analysis: cash flow, cap rate, CoC return, DSCR, 30-year projection, IRR, stress test.
BRRRR Calculatorbrrrr-calculator
Buy, rehab, rent, refinance — track cash left in the deal after the refi cashout.
Cap Rate Calculatorcap-rate-calculator
Net operating income ÷ purchase price. The market's go-to yield metric.
Cash-on-Cash Return Calculatorcash-on-cash-calculator
Annual pre-tax cash flow ÷ total cash invested. The leveraged-return metric.
Fix-and-Flip Calculatorfix-and-flip-calculator
Purchase + rehab + holding + selling → gross profit, net profit, ROI, annualized ROI, 70% rule check.
1031 Exchange Calculator1031-exchange-calculator
Realized gain, boot, recognized gain, deferred tax, and basis carryover for like-kind exchanges.
Depreciation Calculatordepreciation-calculator
Residential 27.5-yr, commercial 39-yr, bonus depreciation, recapture liability at sale.
Airbnb / STR Calculatorairbnb-calculator
Occupancy, ADR, cleaning, channel fees — full short-term-rental ROI.
Syndicator Waterfall Calculatorsyndicator-waterfall-calculator
LP/GP splits with preferred return, catch-up, and promote tiers. Models distributions year by year.
DSCR Loan Calculatordscr-loan-calculator
Will this rental qualify for a DSCR loan? Computes DSCR, max loan + max price at target DSCR, and the rent or NOI gap if it doesn't pencil.
Buy vs Rent Calculatorbuy-vs-rent-calculator
Would you be wealthier buying or renting over the next N years? Compares cumulative cost, equity buildup, and the renter's invested savings year by year.
Mortgage Payoff Calculatormortgage-payoff-calculator
How much faster will I pay off with an extra $X/month? Shows months saved, total interest saved, and the new payoff date.
Refi Break-Even Calculatorrefi-breakeven-calculator
When does the refinance start saving you money? Monthly savings, break-even months, lifetime interest delta, and a buy/no recommendation based on your hold horizon.
Cost Segregation Calculatorcost-segregation-calculator
Quantify the year-1 tax savings from a cost seg study: 5/7/15-year reclass + bonus depreciation, NPV vs the study fee, and the recapture trade-off at sale.
Wholesale MAO Calculatorwholesale-mao-calculator
Maximum Allowable Offer for wholesale deals. ARV × end-buyer LTV minus rehab and your assignment fee — the most you can offer the seller and still find an end buyer.

Pre-filling with a sample deal

Want the embedded calculator to start with specific numbers? Generate the shareable URL inside the live calculator (use the Share button), then use that full URL — including the ?d=... or bare parameter set — but add &embed=true at the end.

<iframe
  src="https://dealmath.app/rental-calculator?monthlyRent=3500&vacancyPercent=8&embed=true"
  width="100%"
  height="900"
  style="border:0;border-radius:8px"
  loading="lazy"
  title="Rental analysis"
></iframe>

Customization

We're keeping the embed minimal at launch — just the calculator, with a small "Powered by DealMath" link at the bottom. Want a theme color or custom defaults for your audience? Reach out and we'll prioritize the request.

Terms of use

Free, no signup, no API key.
Please keep the "Powered by DealMath" attribution visible — that's the deal.
No reverse-engineering or scraping the calculator math. The library is unit-tested and intentionally not exposed as an API.
We may rate-limit abusive iframes (running 10,000 OG image renders per minute, etc.) but normal embed traffic is free forever.