How to Put Mortgage Calculator in Excel

Creating a Basic Mortgage Calculator

To create a mortgage calculator in Excel, you'll need to understand the key inputs and outputs. The primary inputs are:

• Loan amount (principal)
• Interest rate (annual percentage rate)
• Loan term (in years)

The primary outputs are:

• Monthly payment amount
• Total interest paid over the life of the loan
• Amortization schedule

Step-by-Step Setup

1. Open a new Excel workbook and name it "Mortgage Calculator"
2. In cell A1, enter "Loan Amount" and in B1, enter the loan amount (e.g., 200000)
3. In cell A2, enter "Annual Interest Rate" and in B2, enter the rate (e.g., 0.04 for 4%)
4. In cell A3, enter "Loan Term (Years)" and in B3, enter the term (e.g., 30)
5. In cell A5, enter "Monthly Payment" and in B5, enter the formula: =PMT(B2/12,B3*12,B1)
6. In cell A6, enter "Total Interest Paid" and in B6, enter: =B5*B3*12-B1

Advanced Excel Formulas

For a more detailed mortgage calculator, you can add additional features:

Amortization Schedule

To create an amortization schedule:

1. In cell D1, enter "Amortization Schedule"
2. In cell D2, enter "Payment Number"
3. In cell E2, enter "Payment Amount"
4. In cell F2, enter "Principal Paid"
5. In cell G2, enter "Interest Paid"
6. In cell H2, enter "Remaining Balance"
7. In cell D3, enter "1"
8. In cell E3, enter the monthly payment from B5
9. In cell F3, enter: =IF(H2+E3*B2/12>0, E3-(H2*B2/12), B1)
10. In cell G3, enter: =H2*B2/12
11. In cell H3, enter: =H2-F3
12. Copy these formulas down the column for the entire loan term

Extra Payment Analysis

To analyze the impact of extra payments:

1. In cell A8, enter "Extra Payment Amount"
2. In cell B8, enter an extra payment amount (e.g., 100)
3. In cell A9, enter "New Loan Term (Months)"
4. In cell B9, enter: =NPER(B2/12,B5,B1,-B8)
5. In cell A10, enter "Total Savings" and in B10, enter: =(B5*B3*12-B1)-(B5*B9/12-B1)

Adding Visualization

Excel's charting tools can help visualize mortgage data:

Creating a Payment Breakdown Chart

1. Select the range with your amortization data
2. Go to Insert > Pie Chart or Column Chart
3. Right-click the chart and select "Select Data"
4. Add a series for "Principal Paid" and "Interest Paid"
5. Format the chart with appropriate colors and labels

Creating a Balance Over Time Chart

1. Select the payment number and remaining balance columns
2. Go to Insert > Line Chart
3. Format the chart to show the balance decreasing over time

Worked Example

Let's create a mortgage calculator for a $200,000 loan at 4% interest over 30 years:

The calculator would show:

• Monthly payment: $995.54
• Total interest paid: $228,213.64
• Total payments: $428,213.64

The amortization schedule would show that over the first year:

• First payment: $995.54 (interest: $800, principal: $195.54)
• Last payment of first year: $995.54 (interest: $16.36, principal: $979.18)
• Total principal paid in first year: $11,700