Loan Calculator
Calculate your loan payments, total interest, and view a complete amortization schedule. Perfect for personal loans, auto loans, or any fixed-rate loan.
Formula:PMT = P × r(1+r)^n / ((1+r)^n - 1)
Loan Summary
Monthly Payment
$501
Total Interest
$5,057
Total Payment$30,057
Payoff DateApril 2031
Interest/Principal20.2%
Loan Details
Enter your loan amount, rate, and term
1,000100,000
%
0%25%
Payment Breakdown
Principal vs. interest allocation
Principal
$25,000
83.2% of total
Total Interest
$5,057
16.8% of total
Loan Balance Over Time
Watch your balance decrease
Amortization Schedule
Monthly payment breakdown
| Month | Payment | Principal | Interest | Balance |
|---|---|---|---|---|
| May 2026 | $501 | $345 | $156 | $24,655 |
| Jun 2026 | $501 | $347 | $154 | $24,308 |
| Jul 2026 | $501 | $349 | $152 | $23,959 |
| Aug 2026 | $501 | $351 | $150 | $23,608 |
| Sep 2026 | $501 | $353 | $148 | $23,255 |
| Oct 2026 | $501 | $356 | $145 | $22,899 |
| Nov 2026 | $501 | $358 | $143 | $22,541 |
| Dec 2026 | $501 | $360 | $141 | $22,181 |
| Jan 2027 | $501 | $362 | $139 | $21,819 |
| Feb 2027 | $501 | $365 | $136 | $21,454 |
| Mar 2027 | $501 | $367 | $134 | $21,088 |
| Apr 2027 | $501 | $369 | $132 | $20,718 |
Showing first 12 of 60 payments
Compare Loan Terms
See how different terms affect costs
| Term | Monthly | Total Interest | Total Cost |
|---|---|---|---|
| 36 months (3 years) | $778 | $2,996 | $27,996 |
| 48 months (4 years) | $604 | $4,015 | $29,015 |
| 60 months (5 years) | $501 | $5,057 | $30,057 |
| 72 months (6 years) | $432 | $6,122 | $31,122 |
| 84 months (7 years) | $383 | $7,210 | $32,210 |
What if you got a different interest rate?
1.00%7.50%20.00%
Monthly Payment
$501
Personalized Insights
2 insights based on your inputs
Shorter Term Savings
A 3-year term would save $2,061 in interest, but payment would be $778/mo.
Extra Payment Impact
Adding $100/month extra could shave months off your loan and save hundreds in interest.
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Frequently Asked Questions
The monthly payment is calculated using the standard amortization formula: M = P × [r(1+r)^n] / [(1+r)^n - 1], where P is the principal, r is the monthly interest rate, and n is the number of payments. This formula ensures equal payments throughout the loan term while properly allocating interest and principal.
An amortization schedule is a complete table showing each loan payment broken down into principal and interest portions. Early payments are mostly interest, while later payments are mostly principal. The schedule shows exactly how your loan balance decreases over time.
Higher interest rates significantly increase your total loan cost. Even a 1% difference can mean thousands of dollars over the life of a loan. For example, on a $200,000 loan over 30 years, a 1% increase in rate adds approximately $40,000 in total interest paid.
Shorter terms mean higher monthly payments but less total interest paid. Longer terms offer lower monthly payments but more total interest. Choose based on your budget and financial goals. A 15-year mortgage vs 30-year typically saves 50%+ in interest.
The interest rate is the cost of borrowing the principal. APR (Annual Percentage Rate) includes the interest rate plus other fees and costs, giving a more complete picture of the loan cost. APR is typically higher than the stated interest rate.
How this works
Standard fully-amortizing loan math: fixed monthly payment sized so the balance reaches zero at the end of term. Interest portion is highest in month 1 and declines each month as principal is paid down.
What this tool can’t do
When to consult a professional
This is a software engineering tool, not financial advice. Run the math here, then take the result to a certified financial planner, CPA, or your bank before making a decision that materially affects your money.
Sources
- [1]Consumer Financial Protection Bureau (CFPB)Official sourceconsumerfinance.govAccessed Apr 21, 2026
US consumer finance regulator; authoritative on mortgage disclosures, APR rules, credit cards.
Joseph OrdunaFounder & Software Engineer
Full-stack software engineer specializing in embedded systems, web architecture, and AI/ML. Founder of Practical Web Tools. Built the gesture-controlled drone IP acquired by KD Interactive (Aura Drone, sold on Amazon).
Loan Summary
Monthly Payment
$501
Total Interest
$5,057
Total Payment$30,057
Payoff DateApril 2031
Interest/Principal20.2%