An embeddable calculator widget is a free tool you copy onto your own website with a short block of HTML, so your readers can run the numbers without leaving your page. Van to Vault publishes eleven of them, free to use on any site, with no limit on how many people run them. The one condition is that you keep the credit link that ships with the code.
How to embed a calculator on your website
Each calculator below has a chrome-free version built to sit inside an iframe. Copy the block of code under the one you want, paste it into an HTML or custom-code block on your page, and publish. The widget loads from Van to Vault, so any update to a formula or a default mortgage rate here shows up in the copy running on your site. Nothing is stored on your server and nothing needs maintaining.
The code includes a short listener script that resizes the iframe to fit its content, so the calculator will not be cut off or leave a gap. It works anywhere you can paste raw HTML: WordPress (use a Custom HTML block, not the visual editor), Squarespace, Wix, Ghost, Webflow, or a hand-built page.
Eleven free calculator widgets to copy
House Hacking Calculator
Runs a duplex or small multifamily deal with the owner living in one unit: PITI, PMI, tenant rent, and what the owner actually pays to live there each month.
See the full tool · Preview the widget by itself
<iframe id="vtv-hh-calc" src="https://vantovault.com/tools/calculator/widget/" title="Van to Vault House Hacking Calculator" width="100%" height="3282" scrolling="no" loading="lazy" style="width:100%;max-width:900px;border:1px solid #e5e5e5;border-radius:10px"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("vtv-hh-calc");if(f&&e.source===f.contentWindow&&e.data&&e.data.vtvCalcHeight){f.style.height=e.data.vtvCalcHeight+"px"}});</script>
<p>Powered by <a href="https://vantovault.com/tools/calculator/">House Hacking Calculator</a> from Van to Vault</p>House-Hack Readiness Roadmap
Turns credit score, savings, and income into a phased plan with the next concrete step toward a first house hack.
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<iframe id="vtv-roadmap" src="https://vantovault.com/tools/roadmap/widget/" title="Van to Vault House-Hack Readiness Roadmap" width="100%" height="2625" scrolling="no" loading="lazy" style="width:100%;max-width:900px;border:1px solid #e5e5e5;border-radius:10px"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("vtv-roadmap");if(f&&e.source===f.contentWindow&&e.data&&e.data.vtvCalcHeight){f.style.height=e.data.vtvCalcHeight+"px"}});</script>
<p>Powered by <a href="https://vantovault.com/tools/roadmap/">House-Hack Readiness Roadmap</a> from Van to Vault</p>Ten-Year Projection
Projects equity, cash flow, and total return over ten years using an amortization schedule rather than a flat appreciation guess.
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<iframe id="vtv-projection" src="https://vantovault.com/tools/projection/widget/" title="Van to Vault Ten-Year Projection" width="100%" height="3567" scrolling="no" loading="lazy" style="width:100%;max-width:900px;border:1px solid #e5e5e5;border-radius:10px"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("vtv-projection");if(f&&e.source===f.contentWindow&&e.data&&e.data.vtvCalcHeight){f.style.height=e.data.vtvCalcHeight+"px"}});</script>
<p>Powered by <a href="https://vantovault.com/tools/projection/">Ten-Year Projection</a> from Van to Vault</p>Rent vs. Buy vs. House Hack
Compares three paths side by side over any time horizon: keep renting, buy a single-family home, or buy a duplex and rent out the other side.
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<iframe id="vtv-rent-vs-buy" src="https://vantovault.com/tools/rent-vs-buy/widget/" title="Van to Vault Rent vs. Buy vs. House Hack" width="100%" height="3958" scrolling="no" loading="lazy" style="width:100%;max-width:900px;border:1px solid #e5e5e5;border-radius:10px"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("vtv-rent-vs-buy");if(f&&e.source===f.contentWindow&&e.data&&e.data.vtvCalcHeight){f.style.height=e.data.vtvCalcHeight+"px"}});</script>
<p>Powered by <a href="https://vantovault.com/tools/rent-vs-buy/">Rent vs. Buy vs. House Hack</a> from Van to Vault</p>Down-Payment Budget
Takes a target purchase price and a monthly savings rate and returns the month the down payment and closing costs are covered.
See the full tool · Preview the widget by itself
<iframe id="vtv-dp-budget" src="https://vantovault.com/down-payment-budget/widget/" title="Van to Vault Down-Payment Budget" width="100%" height="2708" scrolling="no" loading="lazy" style="width:100%;max-width:900px;border:1px solid #e5e5e5;border-radius:10px"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("vtv-dp-budget");if(f&&e.source===f.contentWindow&&e.data&&e.data.vtvCalcHeight){f.style.height=e.data.vtvCalcHeight+"px"}});</script>
<p>Powered by <a href="https://vantovault.com/down-payment-budget/">Down-Payment Budget</a> from Van to Vault</p>BRRRR Calculator
Works the buy, rehab, rent, refinance, repeat loop and shows how much of the starting cash comes back out at the refinance.
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<iframe id="vtv-brrrr" src="https://vantovault.com/tools/brrrr-calculator/widget/" title="Van to Vault BRRRR Calculator" width="100%" height="2619" scrolling="no" loading="lazy" style="width:100%;max-width:900px;border:1px solid #e5e5e5;border-radius:10px"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("vtv-brrrr");if(f&&e.source===f.contentWindow&&e.data&&e.data.vtvCalcHeight){f.style.height=e.data.vtvCalcHeight+"px"}});</script>
<p>Powered by <a href="https://vantovault.com/tools/brrrr-calculator/">BRRRR Calculator</a> from Van to Vault</p>House Hacker’s FIRE Projector
Models a path to financial independence with rental income included alongside an index-fund savings rate.
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<iframe id="vtv-fire" src="https://vantovault.com/tools/fire-projector/widget/" title="Van to Vault House Hacker's FIRE Projector" width="100%" height="2337" scrolling="no" loading="lazy" style="width:100%;max-width:900px;border:1px solid #e5e5e5;border-radius:10px"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("vtv-fire");if(f&&e.source===f.contentWindow&&e.data&&e.data.vtvCalcHeight){f.style.height=e.data.vtvCalcHeight+"px"}});</script>
<p>Powered by <a href="https://vantovault.com/tools/fire-projector/">House Hacker's FIRE Projector</a> from Van to Vault</p>Rent Comp Worksheet
Estimates what a unit should rent for from comparable listings using a median dollar-per-square-foot method.
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<iframe id="vtv-rent-comp" src="https://vantovault.com/tools/rent-comp-worksheet/widget/" title="Van to Vault Rent Comp Worksheet" width="100%" height="2152" scrolling="no" loading="lazy" style="width:100%;max-width:900px;border:1px solid #e5e5e5;border-radius:10px"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("vtv-rent-comp");if(f&&e.source===f.contentWindow&&e.data&&e.data.vtvCalcHeight){f.style.height=e.data.vtvCalcHeight+"px"}});</script>
<p>Powered by <a href="https://vantovault.com/tools/rent-comp-worksheet/">Rent Comp Worksheet</a> from Van to Vault</p>Rehab Cost Estimator
Builds a line-item renovation budget with a contingency buffer, cost per square foot, and the 70 percent rule maximum offer for a fix and flip.
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<iframe id="vtv-rehab-embed" src="https://vantovault.com/tools/rehab-cost-estimator/widget/" title="Van to Vault Rehab Cost Estimator" width="100%" height="2250" scrolling="no" loading="lazy" style="width:100%;max-width:900px;border:1px solid #e5e5e5;border-radius:10px"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("vtv-rehab-embed");if(f&&e.source===f.contentWindow&&e.data&&e.data.vtvCalcHeight){f.style.height=e.data.vtvCalcHeight+"px"}});</script>
<p>Powered by <a href="https://vantovault.com/tools/rehab-cost-estimator/">Rehab Cost Estimator</a> from Van to Vault</p>Wholesaling Calculator
Works out the maximum allowable offer, the most you can put a property under contract for, and the margin left for your end buyer after your assignment fee.
See the full tool · Preview the widget by itself
<iframe id="vtv-wholesale-embed" src="https://vantovault.com/tools/wholesaling-calculator/widget/" title="Van to Vault Wholesaling Calculator" width="100%" height="1750" scrolling="no" loading="lazy" style="width:100%;max-width:900px;border:1px solid #e5e5e5;border-radius:10px"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("vtv-wholesale-embed");if(f&&e.source===f.contentWindow&&e.data&&e.data.vtvCalcHeight){f.style.height=e.data.vtvCalcHeight+"px"}});</script>
<p>Powered by <a href="https://vantovault.com/tools/wholesaling-calculator/">Wholesaling Calculator</a> from Van to Vault</p>Airbnb Calculator
Compares a short-term rental net income against a long-term lease on the same property and finds the occupancy rate where the two break even.
See the full tool · Preview the widget by itself
<iframe id="vtv-airbnb-embed" src="https://vantovault.com/tools/airbnb-calculator/widget/" title="Van to Vault Airbnb Calculator" width="100%" height="1900" scrolling="no" loading="lazy" style="width:100%;max-width:900px;border:1px solid #e5e5e5;border-radius:10px"></iframe>
<script>window.addEventListener("message",function(e){var f=document.getElementById("vtv-airbnb-embed");if(f&&e.source===f.contentWindow&&e.data&&e.data.vtvCalcHeight){f.style.height=e.data.vtvCalcHeight+"px"}});</script>
<p>Powered by <a href="https://vantovault.com/tools/airbnb-calculator/">Airbnb Calculator</a> from Van to Vault</p>What it costs and what you have to keep
- Free for any site, including commercial sites, agent sites, and sites that run ads.
- Keep the credit line. The Powered by paragraph sits outside the iframe on purpose, because a link inside an iframe is credited to Van to Vault rather than to you. Leaving it in place is the whole price.
- Do not paywall it. The tools are free to readers here and should stay free to readers on your site.
- You may restyle the frame (width, border, radius, margins). Please do not alter the calculator output or present it as your own tool.
- No tracking is added to your page. The widget sets no cookies on your domain and the resize message carries a pixel height and nothing else.
- Van to Vault may update the formulas behind a widget. If a tool is ever retired, the page it lives on will redirect rather than break.
Want a version tuned to your audience?
If you write for a specific city, a specific loan program, or a specific kind of reader, get in touch through the contact page and say what you would want the defaults set to. Building a variant is straightforward and there is no charge for it.
Prefer to link rather than embed? The full tools live at vantovault.com/tools, and the underlying metro data is published on the duplex markets hub.
Frequently asked questions
Is the calculator embed free to use on a commercial site?
Yes. A Van to Vault embed is defined as a free, unlimited-use iframe of a published calculator, and that covers commercial sites, agent sites, and sites that run advertising. The one requirement is keeping the credit link that ships with the code.
How do I embed a house hacking calculator on WordPress?
Embedding on WordPress is defined as pasting the widget code into a Custom HTML block rather than the visual editor. Copy the code under the calculator you want, add a Custom HTML block where the tool should appear on the page, paste it in, and publish.
Will the embedded calculator resize to fit my page?
Automatic resizing is defined as the widget reporting its rendered height to the page hosting it so the iframe can match that height. The code includes a short listener script that does this when the widget loads, when the window is resized, and whenever a reader changes an input.
Does an embedded calculator slow down my site or add tracking?
An iframe embed is defined as a separate document loaded inside its own frame, which means it does not block your own page from rendering. The code uses lazy loading, sets no cookies on your domain, and the only message it passes to your page is a pixel height.
Can I change the default numbers in an embedded calculator?
Default values are defined as the starting figures a calculator loads with before a reader types anything. The public widgets carry Van to Vault defaults, and a variant built around different ones, such as a particular city or loan program, can be set up on request through the contact page.
Keep going
Start with the full calculator library, read the pillar on what house hacking is, or look at the eleven ranked metros, eight of which have owning a duplex cheaper than renting.[S1]
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Sources
- [S1] Van to Vault, read 24 September 2026: “Of the 11 ranked, 8 leave an owner ahead of renting month to month. The other 3 rank on entry price and durability.” vantovault.com.