Loan Overpayment Calculator
See how much interest you overpay on a loan and how to reduce it. Calculate total interest cost and savings from extra payments
Calculator
How to Calculate
- 1Enter the loan amount - the total amount you borrowed
- 2Enter the annual interest rate (APR) - the interest rate charged by your lender
- 3Enter the loan term in years - how long you have to repay the loan (must be an integer between 1 and 50)
- 4Select payment frequency - choose monthly or bi-weekly payments
- 5Optionally enter extra monthly payment - additional amount you plan to pay each month to reduce interest
- 6Select loan type - choose annuity (fixed payment) or interest-only
- 7Click "Calculate" to see your loan overpayment and interest costs
- 8Review the overpayment - this is the total interest you pay beyond the principal
- 9Understand that longer loan terms result in much higher overpayment due to interest accumulation
- 10If you entered extra payments, see how much interest you save and how much time you shave off the loan
Calculation Examples
Example 1: Standard Loan
Calculation Steps
- Loan amount: $20,000
- Annual interest rate: 7% (APR)
- Loan term: 5 years
- Payment frequency: Monthly
- Extra payment: $0
- Regular monthly payment: $396.36
- Total payment: $23,781.60
- Total interest (overpayment): $3,781.60
- Overpayment percentage: 18.9% of loan amount
Result
A $20,000 loan at 7% APR for 5 years requires a monthly payment of $396.36. Over 5 years, you pay $23,781.60 total, meaning you overpay by $3,781.60 in interest - nearly 19% of the original loan amount. This demonstrates how even moderate interest rates result in significant overpayment over standard loan terms.
Example 2: Long-Term Loan
Calculation Steps
- Loan amount: $200,000
- Annual interest rate: 5% (APR)
- Loan term: 30 years
- Payment frequency: Monthly
- Extra payment: $0
- Regular monthly payment: $1,073.64
- Total payment: $386,510.40
- Total interest (overpayment): $186,510.40
- Overpayment percentage: 93.3% of loan amount
Result
A $200,000 loan at 5% APR for 30 years requires a monthly payment of $1,073.64. Over 30 years, you pay $386,510.40 total, meaning you overpay by $186,510.40 in interest - nearly as much as the original loan amount! This dramatic overpayment demonstrates why longer loan terms are so expensive, even with relatively low interest rates.
Example 3: Extra Payments
Calculation Steps
- Loan amount: $150,000
- Annual interest rate: 4.5% (APR)
- Loan term: 25 years
- Payment frequency: Monthly
- Extra payment: $200 per month
- Regular monthly payment: $843.21
- Payment with extra: $1,043.21
- Standard total interest: $102,963.00
- Total interest with extra: $75,234.00
- Interest saved: $27,729.00
- Loan term reduction: 6.2 years (from 25 to 18.8 years)
Result
A $150,000 loan at 4.5% APR for 25 years normally requires $843.21 monthly and results in $102,963 in total interest. By adding just $200 extra per month, you save $27,729 in interest and pay off the loan 6.2 years early. The extra $200 per month ($48,000 total) saves you $27,729 in interest, demonstrating the powerful impact of extra payments on reducing overpayment.
Frequently Asked Questions
Find answers to common questions about using this calculator. If you have additional questions, feel free to explore the examples above or contact our support team.
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