Try it yourself
This is a real, working CalcForms calculator, right here on the page. Enter your details and watch the estimate update on the spot. It is exactly what your customers would use, and every submission lands in your dashboard as a lead.
What it calculates
- Shows live monthly savings, new payment and break-even month as the homeowner enters current and new terms
- Keeps your real Excel refi worksheet: payment math on old and new loans, closing-cost rollup and break-even logic
- Captures each homeowner as a warm lead with balance, current rate and projected savings already calculated
- Update target rates, closing-cost assumptions or cash-out rules later just by asking ChatGPT
- Backtest against past refis so the savings you advertise match deals you actually closed
Why it closes more deals
A live number closes deals
Customers who see a real estimate the second they enter their details are far likelier to book than ones told to call for a quote. The number is the hook.
Runs your most complex spreadsheet
Multi-tab workbooks, lookup tables, tiered rates, conditional line items, the lot. If the math runs in Excel, CalcForms runs it behind a clean form.
Update it by chatting
Prices move. Ask ChatGPT to change a rate, add an option, or insert a step and the live form updates in seconds. No developer, no redeploy.
Backtest before you publish
Run your last 20 real jobs through it and tune the formula until the live estimate matches what you actually charge. Ship it once it lines up.
Why calculator forms convert — by the numbers
47.3% vs 2.8%
In an analysis of 50,000+ forms, interactive forms averaged a 47.3% conversion rate versus 2.8% for static forms. (Outgrow)
2× conversions
Interactive content generates roughly twice as many conversions as static content. (Content Marketing Institute)
51% of buyers
51% of B2B software buyers now begin their research in an AI chatbot rather than a search engine. (G2, 2026)
1 in 3
A third of B2B buyers have chosen a vendor they had never heard of before, on an AI assistant's recommendation. (G2, 2026)
How this form was built
No template builder and no code. One message to ChatGPT with CalcForms added:
Build this exact form
CalcForms is an app you add to ChatGPT once. After that you build and edit forms just by chatting. Works in Claude too.
- Add CalcForms to ChatGPT. Open the CalcForms app page, click Add, and sign in with your email. One time, about 60 seconds. A free ChatGPT account works. (Using Claude? Setup here.)
- Say the words below. ChatGPT builds the form with your math inside and gives you a link.
- Share it, then change it by asking. Send the link to customers. Change a rate or add a question later just by asking.
Step-by-step: turn your spreadsheet into a form, add your price list, show customers one number. All guides →
"Build a refinance savings calculator from my refi worksheet. Run PMT on the current loan and on a new 30-year loan at the new rate, show the monthly savings, then divide closing costs by monthly savings for the break-even month. Flag when break-even is under 24 months."
Example run: A homeowner with 320,000 dollars left at 7.25 percent enters a new rate of 6.125 percent and 6,500 dollars in costs. The form shows about 245 dollars saved per month and a 27-month break-even, then sends you the lead with balance and savings attached.
How does it work? CalcForms is an official ChatGPT app. Once it is added, ChatGPT can build, publish and update real calculator forms for you, all from the chat window. Your customers never need ChatGPT; they just open a link.
What it works out
New monthly paymentMonthly savingsBreak-even pointLifetime interest saved
FAQ
Does it show the break-even point, not just the new payment?
Can it handle rolling closing costs into the loan?
Can I tweak the assumptions as rates fall?
Build yours in the next 10 minutes.
Your first form is free. No credit card.
Add to ChatGPT, free →