Whether you’re planning a personal loan, auto financing, or a business loan, understanding your monthly payments and total cost is critical. Our Loan Calculator gives you a complete picture of your borrowing costs before you commit.
Loan Calculator
Calculate monthly payments, total interest, and total cost for any type of loan.
How the Loan Calculator Works
We use the standard amortization formula used by banks and lenders worldwide:
Monthly Payment = P × [r(1+r)ⁿ] ÷ [(1+r)ⁿ − 1]
Where P = principal (loan amount), r = monthly interest rate (annual rate ÷ 12), and n = total number of payments (term × 12).
For a $25,000 loan at 6% APR over 5 years: Monthly payment ≈ $483.32, total interest ≈ $3,999.
Worked Example — Comparing Two Loan Offers
Scenario
Maria wants to borrow $15,000 for a used car. She has two loan offers and wants to understand the real cost of each before deciding.
Offer A — Bank Loan
Inputs:
- Loan Amount: $15,000
- Interest Rate: 6.5% APR
- Loan Term: 4 years
Result:
- Monthly Payment: ~$356
- Total Interest Paid: ~$2,088
- Total Cost: ~$17,088
Offer B — Credit Union
Inputs:
- Loan Amount: $15,000
- Interest Rate: 4.9% APR
- Loan Term: 4 years
Result:
- Monthly Payment: ~$345
- Total Interest Paid: ~$1,554
- Total Cost: ~$16,554
Interpretation
The credit union offer saves Maria $11 per month and $534 in total interest over the life of the loan. That is real money — equivalent to skipping several utility bills. The lower rate does not change the monthly payment dramatically, but the savings add up over time.
Practical Advice
- Always compare at least two loan offers before signing.
- A lower interest rate always saves money on the same loan term.
- Shorter terms mean higher monthly payments but less total interest.
- Use this loan calculator before visiting a dealership or bank — not after.
💡 Next Decision
If you are comparing two offers: Enter the terms of each offer into the calculator above. Compare the total interest paid, not just the monthly payment. Choose the option that costs less overall — unless the lower monthly payment is essential for your budget.
If you are considering a shorter term: Try a 3-year term with the same rate. You will pay more per month but save hundreds in interest.
If you want to understand the full cost of borrowing: Use our Interest Calculator to see how interest accumulates over different time periods.
If you have multiple debts: Use our Debt Payoff Calculator to compare Snowball vs Avalanche strategies.
If you are comparing investing vs borrowing: Use our Compound Interest Calculator to see what your money could earn if invested instead.
Frequently Asked Questions
What’s the difference between APR and interest rate?
APR includes both the interest rate and any fees, giving you the true cost of borrowing. Our calculator uses the interest rate — check your loan agreement for the APR.
Can I pay off my loan early?
Most lenders allow early repayment, but some charge prepayment penalties. Check your loan terms before making extra payments.
Pro Tips
- A shorter term means higher monthly payments but significantly less total interest
- Improve your credit score before applying to qualify for lower rates
- Compare offers from at least 3 lenders before committing
Related Tools
- Use our Debt Payoff Calculator to compare debt repayment strategies
- Use our Mortgage Calculator to estimate home loan payments
- Use our Compound Interest Calculator to see how your savings could grow
- Explore all our financial tools on the Personal Finance Hub