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Mortgage Calculator for Brokers — Built From Your Sheet

Love SpreadsheetsPublished Jul 22, 20265 min read

A borrower hunting for a payment estimate has ten thousand places to get one. Zillow has a calculator. Bankrate has a calculator. Every megabank has a calculator. That ubiquity is precisely why the generic version earns you nothing: the portal keeps the traffic and auctions the inquiry to whichever lender bids highest.

Here's what those sites don't have: the workbooks on your laptop. Loan officers rarely live in plain payment math anyway — the questions that actually move a file forward are "what price range can I realistically shop," "does a refi pay for itself before we relocate," and "am I burning money renting." You've built a spreadsheet for each, tuned with the tax assumptions and PMI thresholds real closings taught you.

Love Spreadsheets turns those workbooks into a suite of live calculators on a page you own — where the visits, the branding, and every captured email belong to your practice. No code, and no reconstructing formulas inside a widget editor.

Step 1: Line Up the Three Workbooks Borrowers Ask About

Each sheet already has the anatomy a calculator needs: cells where numbers go in, cells where formulas push answers out. Add a blank Leads tab (one shared tab works if all three tools live in a single workbook). Excel and Google Sheets both upload as-is.

CalculatorVisitor entersFormulas return
AffordabilityHousehold income $145,000; monthly debts $850; down payment saved $60,000Max purchase price ≈ $487,000, with the estimated payment at that price
Refinance break-evenCurrent rate 7.125%; new rate 6.25%; balance $412,000; closing costs $6,800Savings of $233/month; break-even at month 30
Rent vs. buyCurrent rent $2,450; target home price $420,000; years planning to stay: 6Six-year cost of each path and the crossover year

Step 2: Grab a Free Account

Building the suite, hosting it, and collecting the leads all run on the free tier at lovespreadsheets.com; serving it from yourname.com instead of a hosted URL is what the paid plan adds.

lovespreadsheets.com
Describe what you want to build from your spreadsheet…
borrower_toolkit.xlsxSend →
Your free account, your sheet attached — borrower_toolkit.xlsx stays the source of truth.

Step 3: Describe the Suite in Loan-Officer English

Choose the Calculator template and write out what you want, the way you'd brief an assistant:

"One page, three tools from my workbook: Affordability, Refi Break-Even, and Rent vs Buy. Visitors pick a tool, enter their numbers, and my formulas produce the answers. Require an email before results appear, then add a row to the Leads tab recording the email, which tool they used, and every figure they typed."

Three requests worth adding for a mortgage practice:

  • A multi-calculator layout — one URL that reads like a borrower resource center rather than a lonely widget, so it earns bookmarks and shares
  • Co-branded copies for realtor partners — identical math wearing a partner's headshot and colors, plus a Partner column in the Leads tab so you know which agent's listing page sent each borrower
  • Rates kept in a single cell — when the market moves Thursday morning, you edit that one cell and every live calculator moves with it

Hit AI Optimize if your description feels thin, field whatever clarifying question comes back, and the suite is typically live within fifteen to twenty minutes. Prefer embedding over linking? Grab the whole thing as an HTML file and nest it inside the site you already run.

lovespreadsheets.com
"One page with my three tools, Affordability, Refi Break-Even, and Rent vs Buy, require an email before results, and log which tool and every figure to Leads."
borrower_toolkit.xlsx✦ AI OptimizeSend →
Plain English is the whole interface — AI Optimize tightens the wording if it needs it.
lovespreadsheets.com
Building your calculator suite
Reading your columns
Designing the app
·Wiring two-way sync
The AI builds while you watch (or play) — typically 15–20 minutes.

Step 4: Distribution Is the Fun Part

Your own site gets the hub page. Realtor partners embed their co-branded copy on listing pages and open-house QR codes — their foot traffic, your Leads tab. The affordability tool rides in your email signature, and the refi break-even link goes out every time rates drop a quarter point.

Now look at what a captured lead actually contains. A "contact me" form tells you nothing; a Leads-tab row tells you this visitor is carrying 7.125% on a $412,000 balance — a refi file introducing itself. A $60,000 down payment reads differently than $9,000, and you know which conversation you're walking into before you dial. One caveat belongs on the results screen itself: these figures are estimates meant to start a conversation, not a pre-approval, a rate lock, or lending advice — say so in the footer.

lovespreadsheets.com
oakline-mortgage.lovespreadsheets.app/refiCopy link
Private — team logins only+ Add team memberCustom domain: Connect
One link for the whole team — private logins and your own domain are the paid extras.
What you end up with
oakline-mortgage.lovespreadsheets.app/refi
Refi Break-EvenLive appFormulas from your sheet
Current rate
7.125%
New rate
6.25%
Closing costs
$6,800
Break-even
Month 30
Enter email to see full results
A Leads-tab row that says 7.125% on a $412,000 balance is a refi file introducing itself before you dial.

Why Mortgage Brokers Keep the Sheet

Your assumptions stay inspectable. Widget calculators bury tax and PMI logic where you can't audit it. Here every assumption is a cell you can point to when a borrower asks where a number came from.

Partner co-branding scales without duplicate work. Ten realtor relationships means ten branded front ends reading one workbook — and a single consolidated Leads tab with attribution built in.

The pipeline starts where the leads land. Because captured borrowers arrive as sheet rows, they flow straight into the same spreadsheet a sheet-based mortgage broker CRM reads — no export step between marketing and follow-up.

Common Questions from Mortgage Brokers

Can I add compliance language? Yes — spell out the disclaimer you need and where it should sit. Most brokers place "estimates only, not an offer of credit" beneath the results and an NMLS number in the footer.

Do realtor partners get the leads too? That's your call, not the software's. Rows land in your workbook; you can share a filtered view with a partner or simply close the loop by phone.

How fast can I react when rates change? As fast as you can edit a cell. The published calculators never stop being your spreadsheet, so there's no redeploy, no ticket, no waiting.

Build Yours

Those three workbooks have been answering borrower questions privately for years. Point lovespreadsheets.com at them, describe the suite, and let the questions start arriving with email addresses attached.

Skip the manual steps — build this in 60 seconds
Upload the sheet you already have and let AI turn it into a working app.
Try it free
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The team turning other people's spreadsheets into software they actually trust — one sheet at a time.

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