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Fixed Rate vs. Interest Only Mortgage Calculator

Compare a standard fixed-rate loan against an interest-only loan — payment and total cost.

  • Free to use here · embed on the Free plan
  • 4 inputs · 6 results
  • English & Spanish

Try the Fixed Rate vs. Interest Only Mortgage Calculator

Compare fixed-rate and interest-only loans — results update as you type.

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Estimates only — not a loan offer or financial advice.

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What this calculator does

What the Fixed Rate vs. Interest Only Mortgage calculator works out

The Fixed Rate vs. Interest Only Mortgage Calculator is a free, embeddable calculator from CalcFunnel. Compare a standard fixed-rate loan against an interest-only loan — payment and total cost.

You enter 4 inputs: loan amount, interest rate (%), loan term (years) and interest-only period (years).

It returns extra interest with IO, interest-only payment, IO payment after period, fixed payment, interest-only total cost and fixed-rate total cost.

Built for loan officers, brokers and homebuyers. Embedding it on your own website is included on the Free plan (free forever for up to 5 calculators on one domain), as part of the Mortgage & Home Loans category.

Results it shows

  1. 01Extra Interest with IO
  2. 02Interest-Only Payment
  3. 03IO Payment After Period
  4. 04Fixed Payment
  5. 05Interest-Only Total Cost
  6. 06Fixed-Rate Total Cost

The first figure — extra interest with io — is the headline result.

Inputs

The inputs it uses

Each field below comes straight from the calculator, with the same help text visitors see when they hover the info icon.

Loan Amount
The total amount you plan to borrow.
Interest Rate (%)
The annual interest rate, applied to both the fixed loan and the interest-only loan for a fair comparison.
Loan Term (years)
The full repayment term of both loans in years.
Interest-Only Period (years)
How many years the interest-only loan pays interest only before it begins amortizing over the remaining term.

For your website

Embed this calculator on your website

Put the Fixed Rate vs. Interest Only Mortgage Calculator on your own site with your colors, copy and lead form. Every calculation can arrive in your CRM with the numbers attached.

Works on WordPress, Wix, Squarespace, Webflow, Shopify, GoHighLevel and plain HTML — paste one line into an HTML or code block. No plugin needed.

Start free How embedding works

Free plan, no card. 14-day trial on Pro & Business.

  1. Inline on any pagePaste the snippet where the calculator should appear. It fills the width of its container and resizes to fit its content.
  2. Popup buttonA button sits on your page; visitors click it and the calculator opens in a popup.
  3. Floating corner widgetPaste once — or in your site-wide footer code — to show a floating calculator bubble in the corner of every page.
  4. Open from your own link or buttonGive any existing link, button or image a class and it opens the calculator when clicked.
  5. Direct linkA full-page link to the calculator for emails, social posts, QR codes or a menu item.

FAQ

Fixed Rate vs. Interest Only Mortgage calculator FAQs

Still stuck? Ask the team — we reply within one business day.

Q.01What does the Fixed Rate vs. Interest Only Mortgage Calculator calculate?
Compare a standard fixed-rate loan against an interest-only loan — payment and total cost. It returns extra interest with IO, interest-only payment, IO payment after period, fixed payment, interest-only total cost and fixed-rate total cost.
Q.02What information do I need to use the Fixed Rate vs. Interest Only Mortgage Calculator?
You enter 4 inputs: loan amount, interest rate (%), loan term (years) and interest-only period (years). Every input starts with a sensible default, so you can change only what you know.
Q.03What does “Loan Amount” mean in the Fixed Rate vs. Interest Only Mortgage Calculator?
The total amount you plan to borrow.
Q.04What does “Interest Rate (%)” mean in the Fixed Rate vs. Interest Only Mortgage Calculator?
The annual interest rate, applied to both the fixed loan and the interest-only loan for a fair comparison.
Q.05Is the Fixed Rate vs. Interest Only Mortgage Calculator free to use?
Yes — you can use it on this page for free, without an account. Embedding it on your own website is included on the Free plan (free forever for up to 5 calculators on one domain), as part of the Mortgage & Home Loans category. Compare plans.
Q.06Can I embed the Fixed Rate vs. Interest Only Mortgage Calculator on my website?
Yes. Embed it inline, as a popup button, as a floating corner widget, from your own link or button, or share a direct link. It works on WordPress, Wix, Squarespace, Webflow, Shopify, GoHighLevel and plain HTML sites with one line of code — see embedding.
Q.07Is the Fixed Rate vs. Interest Only Mortgage Calculator available in Spanish?
Yes. Labels, tooltips and result names are available in English and Spanish, and visitors can switch language in the calculator.
Q.08Can the calculator capture leads?
Yes. It can end with a lead form, a Get a Quote form, a Share panel or a button to any URL. Leads are saved with the inputs and results attached and can be forwarded to your CRM by webhook.
Q.09Are the Fixed Rate vs. Interest Only Mortgage results financial advice?
No. Estimates only. The interest-only option defers principal, lowering early payments but raising total interest and the later payment. Confirm terms with your lender.

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