What Is a Repayment Calculator?
You are offered a $15,000 personal loan at 12% APR over 5 years. The monthly payment looks manageable at $333.67. But do you know the total cost? Over 60 months, you will pay $20,020, including $5,020 in interest alone. That is one-third of the original loan amount added on top. A repayment calculator shows you this total cost upfront, before you sign anything.
According to Bankrate, the best personal loan rates in July 2026 start at 6.20% APR, but the average rate is 12.16%. NerdWallet reports that as of July 1, 2026, the average personal loan rate for consumers with good credit (690 to 719 score) was 19.04%. For comparison, the average credit card interest rate on accounts with balances was 22.15% as of May 2026, per Forbes Advisor. Whether you are taking out a personal loan, consolidating debt, or financing a large purchase, knowing your repayment figure upfront helps you budget accurately and avoid financial surprises.
What This Calculator Does
This tool calculates fixed monthly repayment amounts for any standard amortizing loan and projects your total repayment cost over the full term. For calculating mortgage payments specifically, our Mortgage Calculator includes property taxes, insurance, and PMI.
Inputs Required
- Loan Amount: The total amount you are borrowing
- Annual Interest Rate: The yearly interest rate quoted by the lender (use APR for the most accurate total cost)
- Loan Term: The number of years over which the loan will be repaid
Outputs Provided
- Monthly Repayment: The fixed amount due each month
- Total Repaid: All payments combined over the full term
- Total Interest: The amount paid above the original principal
- Annual Breakdown Chart: A visual showing principal and interest paid each year
How the Calculation Works
Loan repayments are calculated using the standard amortization formula. Each monthly payment covers the interest accrued during that period plus a portion of the outstanding principal. Early payments are weighted toward interest; later payments reduce more principal.
Monthly Payment = P x [r(1 + r)^n] / [(1 + r)^n - 1]
Where:
- P = Principal (loan amount)
- r = Monthly interest rate (annual rate divided by 12)
- n = Total number of payments (years multiplied by 12)
For example, on a $20,000 loan at 6.5% over 5 years, the monthly rate is 0.065 / 12 = 0.00542. With 60 payments, the formula produces a monthly repayment of $391.32, totaling $23,479 over the term. For modeling extra payments to pay off debt faster, our Mortgage Payoff Calculator demonstrates the impact of additional principal payments.
How to Use the Calculator
- Enter the amount you want to borrow in the Loan Amount field
- Input the annual interest rate offered by your lender (use the APR, not the nominal rate)
- Select or type the loan term in years using the slider or preset buttons
- Your monthly repayment, total repaid, and total interest display instantly
- Adjust any input to compare different loan scenarios side by side
Example Calculations
Example 1: Personal Loan at Average Rate
A borrower takes out a $10,000 personal loan at 12.16% APR (the July 2026 average per Bankrate) over 3 years:
- Monthly rate: 12.16% / 12 = 1.013%
- Number of payments: 3 x 12 = 36
- Monthly repayment: $333.10
- Total repaid: $11,991.60
- Total interest: $1,991.60
Example 2: Comparing Loan Terms
Now compare a 5-year term on the same $10,000 loan at 12.16%: the monthly payment drops to $223.78 but total interest rises to $3,426.80. A longer term reduces monthly pressure but increases the overall cost of borrowing by $1,435.20. For a full amortization schedule, our Amortization Calculator shows year-by-year principal and interest breakdowns.
Real-World Scenarios
Consolidating Credit Card Debt
Jennifer, a 34-year-old marketing manager in Denver, has $18,000 in credit card debt at 22.15% APR (the May 2026 average per Forbes Advisor). Her minimum payments barely cover interest. She qualifies for a personal loan at 9.5% APR over 5 years. The calculator shows her new monthly payment of $380.16 and total interest of $4,809.60. Compared to continuing minimum payments on the credit cards (which would take over 14 years and cost $18,000+ in interest), the consolidation loan saves her approximately $13,000 and pays off 9 years faster.
Financing Home Improvements
David and Sarah, a couple in Portland, are financing a $25,000 kitchen renovation. Their bank offers two options: a home equity loan at 8.2% over 10 years, or an unsecured personal loan at 11.5% over 5 years. The calculator shows the equity loan costs $305.31 per month with $11,637 in total interest, while the personal loan costs $549.59 per month with $7,975 in interest. They choose the personal loan because the higher monthly payment fits their budget and saves $3,662 in interest over the shorter term.
Choosing Between Loan Offers
Marcus, a 41-year-old teacher in Charlotte, needs $12,000 for a used vehicle. His credit union offers 7.2% over 4 years, while an online lender offers 6.8% over 5 years. The credit union loan costs $288.35 per month with $1,841 in interest. The online lender costs $236.49 per month but $2,189 in interest. Marcus uses the calculator to see that the lower rate does not always mean lower total cost when the term is longer. He chooses the credit union because the total cost is $348 lower despite the higher rate.
Why This Calculation Matters
Understanding your repayment amount before borrowing helps you avoid overcommitting. A loan that looks affordable based on the principal alone can become unmanageable once interest is added over a longer term. The Federal Reserve reports that nonrevolving consumer credit (which includes personal and auto loans) increased at an annual rate of 1.6% as of mid-2026. With the average personal loan APR at 12.16% and credit card rates at 22.15%, knowing the total cost of borrowing upfront allows you to choose the right loan, negotiate better terms, and decide whether the purchase is worth financing at all.
Common Mistakes to Avoid
- Only looking at the monthly payment: A low monthly repayment achieved by extending the term can double or triple total interest paid. Always check the total cost, not just the monthly figure. A $15,000 loan at 10% over 3 years costs $2,424 in interest. The same loan over 7 years costs $6,172
- Ignoring fees: This calculator models principal and interest only. Origination fees (typically 1% to 8% of the loan amount), insurance, and other charges are additional costs that increase the true cost of borrowing. Always ask for the APR, which includes most fees
- Using the nominal rate instead of the APR: The annual percentage rate includes fees and reflects the true yearly cost. Make sure the rate you enter matches what the lender has disclosed as the APR. The difference between nominal rate and APR can be 1% to 3%
- Not accounting for early repayment: Some lenders charge early repayment penalties. If you plan to pay off the loan early, check those terms before committing. The Federal Trade Commission recommends reviewing the prepayment penalty clause in your loan agreement
Limitations of This Calculator
This calculator uses standard monthly compounding based on the annual rate divided by 12. It does not account for origination fees, late payment fees, or prepayment penalties. It assumes a fixed interest rate for the entire term, while some loans have variable rates that change with market conditions. The calculator does not model balloon payments, interest-only periods, or graduated payment schedules. For mortgages, results may differ slightly from lender figures due to differences in compounding conventions and the exclusion of escrow items like property taxes and insurance. Always confirm final numbers with your lender before signing a loan agreement.
Authoritative Research & Resources
- Bankrate: Best Personal Loan Rates for July 2026 - Current personal loan rate data showing best rates starting at 6.20% APR and average rates at 12.16%, updated weekly
- Federal Reserve: Consumer Credit (G.19) - The Fed's monthly report on consumer credit trends, including revolving and nonrevolving credit growth rates that influence lending rates
- Forbes Advisor: Average Credit Card Interest Rate - Reports the average credit card APR at 22.15% as of May 2026, useful for comparing personal loan rates against credit card alternatives