Finance

Mortgage Calculator

Estimate monthly mortgage payments, total paid, and interest.

Last validated: 2026-02-14

Mortgage Calculator estimates principal-and-interest payment, total housing payment, payoff timeline, and interest cost with optional taxes, insurance, HOA, and extra principal. It is useful for home-buying decisions, refinance comparisons, and budgeting realistic monthly carrying costs beyond base loan payment. The tool computes standard amortization outputs and includes a first-12-month breakdown so you can see how interest and principal split over time. Extra principal scenarios are included to show payoff acceleration and potential interest savings. Use it to compare financing options before committing to a mortgage plan.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

Mortgage Inputs

Result

Principal + interest: $2,212.24

Total monthly housing payment: $2,212.24

Total paid (P&I only): $796,405.71

Total interest (P&I only): $446,405.71

Payoff months with extra principal: 360

Interest with extra principal: $446,405.71

Amortization Preview (First 12 Months)

Month	Interest	Principal Paid	Ending Balance
1	$1,895.83	$316.40	$349,683.60
2	$1,894.12	$318.12	$349,365.48
3	$1,892.40	$319.84	$349,045.63
4	$1,890.66	$321.57	$348,724.06
5	$1,888.92	$323.32	$348,400.74
6	$1,887.17	$325.07	$348,075.68
7	$1,885.41	$326.83	$347,748.85
8	$1,883.64	$328.60	$347,420.25
9	$1,881.86	$330.38	$347,089.87
10	$1,880.07	$332.17	$346,757.70
11	$1,878.27	$333.97	$346,423.74
12	$1,876.46	$335.78	$346,087.96

How to use this tool

Enter loan amount, rate, term, and optional monthly tax/insurance/HOA values.
Add optional extra principal payment, then click `Calculate`.
Review monthly totals, payoff months, interest impact, and the 12-month amortization preview.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

Principal: 350000.0
Annual rate percent: 6.5
Years: 30
Monthly tax: 0.0
Monthly insurance: 0.0
Monthly hoa: 0.0
Extra principal: 0.0
Monthly payment: 2212.2380822253785

Expected Outputs

Principal: 350000
Annual rate percent: 6.5
Years: 30
Monthly tax: 0

Interpretation

Principal is 350000.0. Use this as a decision input, not as a standalone conclusion.
Annual rate percent is 6.5. Use this as a decision input, not as a standalone conclusion.
Years is 30. Use this as a decision input, not as a standalone conclusion.
Compare at least one conservative and one aggressive scenario before committing to a target.

Scenario Compare (A vs B)

Use this to compare two input sets and quantify change in key outputs.

Scenario A

Principal

Annual rate percent

Years

Monthly tax

Monthly insurance

Monthly hoa

Extra principal

Monthly payment

Scenario B

Principal

Annual rate percent

Years

Monthly tax

Monthly insurance

Monthly hoa

Extra principal

Monthly payment

Explore more versions

Tailored guides for specific audiences, regions, and scenarios.

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Home finance tools

Promote mortgage comparison tools, budgeting apps, and refinancing products.

Mortgage Calculator

Input Pattern

Mortgage Inputs

Result

Amortization Preview (First 12 Months)

How to use this tool

Worked Example

Example Inputs

Expected Outputs

Interpretation

Scenario Compare (A vs B)

Scenario A

Scenario B

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