Repay Short-Term Loan? Calculate Payments and Interest

Yes—a short-term loan is repaid according to its contract, usually through scheduled installments or a single payment on the due date. Use this calculator to estimate the monthly payment and total interest on a fixed-rate, monthly-payment loan; enter the amount, APR and term to see the results.

Formula

This calculator uses the standard fixed-payment loan formula. It first computes a level monthly payment, then estimates total interest as the sum of those rounded payments minus the original principal.

• Monthly payment: M = P × r ÷ [1 − (1 + r)⁻ⁿ]
• Total interest: I = M × n − P
• Monthly rate: r = APR ÷ 1,200
• Number of payments: n = years × 12

P is the loan principal in dollars; APR is the annual percentage rate entered as a percentage; M is the monthly payment in dollars; I is total interest in dollars; and n is the number of monthly payments. The displayed payment is rounded to cents. The total-interest calculation uses that rounded payment, so it may differ slightly from a lender’s calculation or from a calculation using unrounded values.

Worked Example

Using the defaults—$20,000 principal, 8% APR and a five-year term—the monthly rate is 8 ÷ 1,200, or 0.0066667, and the term is 5 × 12, or 60 payments.

1. Monthly payment = 20,000 × 0.0066667 ÷ [1 − (1 + 0.0066667)⁻⁶⁰].
2. The unrounded payment is approximately $405.53; rounded to cents, the estimated payment is $405.53 per month.
3. Total of rounded payments = $405.53 × 60 = $24,331.80.
4. Estimated total interest = $24,331.80 − $20,000 = $4,331.80.

What Repaying a Short-Term Loan Means

“Short-term loan” can describe different repayment arrangements. Some loans are amortizing: each regular payment covers interest due and reduces principal, so the balance declines over time. Other agreements call for a single lump-sum payment, or have a different schedule. The calculator above only models equal monthly payments on a fixed-rate amortizing loan; it does not determine the amount due under every product called short-term credit.

Check the agreement or payment schedule for the due dates, amount, payment method, rate, and any charges. If the contract requires one payment rather than installments, a monthly-payment estimate is not the payoff amount. The amount due can also change if the lender applies payments on different dates or the loan has fees not included in the calculation.

How to Use the Estimate

Enter the amount actually borrowed, the APR stated in the loan disclosure, and the term in years. Convert a term stated in months by dividing months by 12; for example, 18 months is 1.5 years. The calculator then returns a level monthly payment and interest estimate across the full term.

• Use the APR as a percentage, such as 8 for 8%, not 0.08.
• Enter the principal, not the total of all scheduled payments.
• Use the contract’s repayment term rather than the period you hope to take to repay.
• Compare the estimate with the lender’s payment schedule and disclosure, which may reflect details this calculator excludes.

A short term generally means fewer scheduled payments, but each payment can be larger than it would be over a longer term for the same principal and rate. The total interest shown is an arithmetic result under the entered assumptions, not a prediction of whether a loan will be approved or suitable.

Costs, Early Repayment, and Missed Payments

The calculator’s “total interest” is not the same as the total cost of borrowing in every contract. It excludes application or origination charges, late charges, optional services, and other costs unless they are reflected in the APR or principal you enter. Ask the lender for the itemized amount due and whether any charges apply; do not assume the APR alone captures every payment obligation.

Paying extra or settling early can change the interest accrued and the remaining balance, depending on the agreement and payment timing. This calculator assumes exactly the scheduled payment each month and does not calculate an early payoff quote. A payoff figure is date-specific: interest may accrue between the last scheduled payment and the date funds are received. Request an updated payoff amount from the lender before relying on a final figure.

If a payment may be late or unaffordable, contact the lender promptly to ask about the account’s available procedures and the consequences described in the agreement. Do not ignore a missed due date or assume a partial payment changes the schedule. The exact effects depend on the contract and applicable rules, neither of which this calculator evaluates.

Common Misunderstandings and Limits

• APR is not a monthly rate. For this formula, divide the annual percentage by 1,200 to obtain the monthly rate.
• Short-term does not always mean monthly installments. Confirm whether repayment is in installments or a lump sum.
• Interest is not the same as principal. Each payment includes both; the balance falls as principal is repaid.
• A rounded estimate is not a payoff quote. The lender may use exact dates, a different rounding method, fees, or other contract terms.

The formula assumes a fixed APR and equal payments made monthly, with interest accruing monthly. It does not model variable rates, irregular payment dates, skipped or extra payments, daily interest calculations, fees, taxes, insurance, or changes to the agreement. A zero APR is outside the calculator’s input range because the formula shown divides by the monthly rate; with no interest, a simple principal divided by payment count would be a different calculation.

Assumptions

• The rate is fixed for the entire term.
• Payments are equal, monthly, and made at the end of each payment period.
• Interest compounds monthly at APR ÷ 12.
• Fees, taxes, insurance, PMI, and escrow are not included.

Frequently Asked Questions

Do I have to repay a short-term loan?
Yes. Repayment obligations and due dates are set out in the loan agreement. Review that document and contact the lender if you are unclear about what is due.

Can I repay a short-term loan early?
It depends on the agreement and applicable rules. Check the contract for early-payment terms and ask the lender for a date-specific payoff amount before sending a final payment.

Does repaying early always reduce interest?
Not necessarily by the amount a simple estimate suggests. Interest calculation methods, fees, payment timing, and early-payment terms can affect the result. Ask the lender how an extra payment would be applied.

What if I cannot make a scheduled payment?
Contact the lender as soon as possible and ask what options and consequences apply to your account. This calculator cannot determine fees, account status, or any available arrangements.

Why does my lender’s payment differ from the estimate?
The calculator assumes a fixed rate, monthly compounding, equal end-of-month payments, and no separately added fees. The contract may use different timing, rounding, charges, or repayment terms.

This result is an estimate, and the lender’s disclosure gives the exact figures.

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in p | Loan amount | $ | 20000 | 1 | 100000000
in apr | Interest rate (APR) | % | 8 | 0.01 | 100
in yrs | Loan term | years | 5 | 0.0833 | 50
out pmt | Monthly payment | $ | p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2