Mortgage Calculator Template

Your mortgage is probably the biggest bill of your life — this tool helps you take control of it.

Most homeowners just make their monthly payment and hope for the best. But what if you could see exactly what one extra payment a month does to your loan? How many years it cuts off? How many thousands of dollars you keep in your pocket?

This spreadsheet does all of that — automatically.

What's inside:

• 📅 Full 30-year amortization schedule — every payment laid out month by month

• ➕ Extra payment column — add any amount and watch your payoff date move up

• 💰 Instant interest savings calculator — see exactly how much you save

• 📊 Dashboard summary — all your key numbers in one clean view

• ✅ Built-in balance checker — so you can trust every number is right

• 🔒 No subscriptions, no logins — yours to keep forever

Perfect for:

• First-time homeowners who want to understand their loan

• Anyone making extra payments and wondering if it's worth it

• People who want a simple, visual way to plan their payoff

How to use it:

1. Click the link below to open the Google Sheets template

2. Click "Use Template" — this saves a personal copy straight to your Google Drive

3. Go to the Dashboard & Calculator tab — that's where everything lives

4. Enter your loan details in the blue cells — loan amount, interest rate, term, and first payment date

5. Type in an extra monthly payment — even $50 or $100 makes a difference

6. Watch everything update instantly — payoff date, interest saved, years cut off your loan

7. Check the Sample & Guide tab anytime if you need a refresher

Only the Yellow Cells need your input. Everything else calculates automatically — don't edit the other cells.