Google Sheet Mortgage Calculator

Reviewed by: David Chen, CFA | Financial Modeling Expert
Last Updated: October 2025

Skip the spreadsheet formulas and use our instant google sheet mortgage calculator alternative. This tool replicates the standard PMT functions found in Excel and Google Sheets to provide immediate, accurate monthly payment estimates without the need to open a new tab.

google sheet mortgage calculator

The principal amount (“pv”).
The rate (“rate”).
Number of periods (“nper”).
Leave empty to calculate payment (PMT).
Calculated Payment (PMT)
$0.00
Principal & Interest

google sheet mortgage calculator Formula

This tool uses the same logic as the =PMT() function in Google Sheets. If you were building this in a spreadsheet, the syntax would look like this:

Google Sheets Syntax:
=PMT(rate/12, term*12, -loan_amount)

Math Formula:
M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1 ]
Source: Google Docs Editors Help (PMT function)

Variables

  • rate: The annual interest rate (e.g., 6.5%). Divide by 12 for monthly.
  • nper: The total number of payment periods (e.g., 30 years * 12 = 360).
  • pv: The present value, or the total loan amount.

Related Calculators

What is a Google Sheet Mortgage Calculator?

A google sheet mortgage calculator is typically a DIY spreadsheet used by homebuyers who want to manipulate raw data, create custom amortization schedules, or track payments over time.

While spreadsheets offer flexibility, they require knowledge of financial functions like PMT, IPMT, and PPMT. Our web-based calculator provides the same mathematical precision instantly, without the risk of broken formulas or spreadsheet errors.

How to Calculate Mortgage in Google Sheets (Example)

  1. Open Sheet: Create a new Google Sheet.
  2. Set Variables: Cell A1: Rate (0.065), Cell B1: Years (30), Cell C1: Loan (300000).
  3. Type Formula: In Cell D1, type =PMT(A1/12, B1*12, -C1).
  4. Result: The cell will display the monthly payment. Our calculator below does this automatically for you.

Frequently Asked Questions (FAQ)

Why does the PMT function return a negative number?

In financial spreadsheets, payments are outflows, so they are represented as negative numbers. Our calculator converts this to a positive value for readability.

Can I export this to Google Sheets?

While this tool runs in your browser, you can copy the results and paste them into any spreadsheet software for further record-keeping.

Does this match the Excel PMT function?

Yes. Google Sheets and Microsoft Excel use identical logic for standard financial functions like PMT, PV, and FV.

How do I calculate interest only in Sheets?

You would use the =IPMT() function to find the interest portion of a specific period, or simply multiply the balance by the monthly rate.

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