Productive ToolboxMortgage Loan Calculator
Calculate monthly mortgage payments, total interest, amortization schedule, and loan payoff. Free online mortgage calculator with extra payment simulation.
Mortgage Loan Calculator
Calculate monthly mortgage payments, total interest, amortization schedule, and payoff date. Simulate extra payments to see how much you can save.
Settings
Monthly Payment (P&I)
Loan Details
Reduces total interest and payoff time
Optional Costs
Added to monthly total
Added to monthly total
Quick Presets
What is a Mortgage Loan Calculator?
A Mortgage Loan Calculator estimates your monthly mortgage payment based on the loan amount, interest rate, and loan term. It uses the standard amortization formula to show exactly how much of each payment goes toward principal and how much goes toward interest โ and how that ratio shifts over the life of the loan.
This calculator goes beyond the basic monthly payment. It generates a full amortization schedule (monthly and yearly views), compares all common loan terms side by side, simulates the impact of extra monthly payments, and includes optional property tax and insurance for a complete PITI estimate.
All calculations run entirely in your browser. No data is sent to any server. Results can be exported as a TXT summary or a full CSV amortization schedule for use in spreadsheets.
How to Use the Mortgage Loan Calculator
Step-by-Step Guide
- 1Enter the total loan amount (home price minus down payment)
- 2Enter your annual interest rate (e.g. 6.5)
- 3Select the loan term (10, 15, 20, 25, or 30 years)
- 4Optionally enter a down payment to calculate the principal
- 5Add annual property tax and insurance for a full PITI estimate
- 6Enter an extra monthly payment to simulate early payoff
- 7View the amortization schedule and term comparison table
Key Features
- โReal-time calculation as you type
- โFull amortization schedule (monthly and yearly)
- โLoan balance chart over time
- โTerm comparison table (10โ30 years)
- โExtra payment simulation with interest saved
- โProperty tax and insurance (PITI) support
- โCSV export for full amortization schedule
Mortgage Formula Explained
| Variable | Meaning | Example |
|---|---|---|
| M | Monthly payment | $1,896 |
| P | Principal (loan amount) | $300,000 |
| r | Monthly interest rate (annual รท 12) | 6.5% รท 12 = 0.5417% |
| n | Total number of payments | 30 ร 12 = 360 |
| Formula | M = P ร r(1+r)โฟ / ((1+r)โฟโ1) | Standard amortization |
Example Monthly Payments
| Loan Amount | Rate | Term | Monthly Payment | Total Interest |
|---|---|---|---|---|
| $200,000 | 6.0% | 30 yr | $1,199 | $231,676 |
| $300,000 | 6.5% | 30 yr | $1,896 | $382,633 |
| $150,000 | 5.0% | 15 yr | $1,186 | $63,480 |
| $400,000 | 7.0% | 30 yr | $2,661 | $558,036 |
| $500,000 | 7.2% | 20 yr | $3,893 | $434,320 |
Impact of Extra Monthly Payments
| Extra/Month | Months Saved | Interest Saved | New Payoff |
|---|---|---|---|
| $100 | 28 months | $28,400 | 27.7 years |
| $200 | 52 months | $51,200 | 25.7 years |
| $500 | 96 months | $89,600 | 22 years |
| $1,000 | 144 months | $124,000 | 18 years |
Based on $300,000 loan at 6.5% for 30 years. Approximate values.
Who Uses This Calculator?
Home Buyers
Estimate monthly payments before making an offer and understand total loan cost.
Real Estate Agents
Show clients accurate payment estimates for properties at different price points.
Mortgage Applicants
Compare loan terms and rates to find the most affordable financing option.
Financial Planners
Model mortgage scenarios for clients and demonstrate the value of extra payments.
Property Investors
Calculate debt service coverage and cash flow for investment property analysis.
First-Time Buyers
Understand how interest rates and loan terms affect long-term housing costs.
Frequently Asked Questions
What is included in a monthly mortgage payment?
A standard mortgage payment covers principal (reducing your loan balance) and interest (the cost of borrowing). This is called P&I. Your total monthly housing cost (PITI) also includes property taxes and homeowner's insurance, which this calculator supports as optional inputs.
How does a 15-year vs 30-year mortgage compare?
A 15-year mortgage has higher monthly payments but significantly lower total interest โ often 50โ60% less than a 30-year loan. A 30-year mortgage has lower monthly payments, making it more affordable month-to-month, but you pay much more interest over the life of the loan. Use the Term Comparison table to see the exact difference for your loan.
How much do extra payments save?
Extra payments reduce your principal faster, which reduces the interest charged each month. On a $300,000 loan at 6.5%, an extra $200/month saves approximately $51,000 in interest and pays off the loan about 4 years early. Enter your extra payment amount to see the exact savings for your loan.
What is an amortization schedule?
An amortization schedule shows every payment over the life of the loan, broken down into principal and interest portions. Early payments are mostly interest; later payments are mostly principal. This calculator shows both monthly and yearly views, and you can export the full schedule as a CSV file.
What is a good interest rate for a mortgage?
Mortgage rates vary by market conditions, credit score, loan type, and lender. As of recent years, rates have ranged from 3% to 8%+ for 30-year fixed mortgages. A higher credit score (740+) typically qualifies for lower rates. Always compare offers from multiple lenders.
Does this calculator include PMI?
Private Mortgage Insurance (PMI) is not included in this calculator. PMI is typically required when your down payment is less than 20% of the home price. PMI costs roughly 0.5โ1.5% of the loan amount per year. You can add it manually to the insurance field as an approximation.
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