Weekly Payment Calculator: Estimate Loan Payments

A weekly payment list is a schedule of the equal payments needed to repay a loan when payments are made once a week. This calculator estimates the weekly payment from the loan amount, annual percentage rate (APR), and term in years, and shows the total paid and interest over the schedule.

Formula

The calculator applies the standard level-payment loan formula using weekly periods. It assumes 52 payments per year and converts the stated annual percentage rate to a weekly rate by dividing by 5,200:

Payment = P × r ÷ [1 − (1 + r)⁻ⁿ]

• P is the amount borrowed, in dollars.
• r is the periodic weekly rate, calculated as APR ÷ 5,200. For an APR of 8%, r = 8 ÷ 5,200 = 0.00153846 per week.
• n is the number of weekly payments: term in years × 52.
• Payment is the calculated weekly amount, rounded to the nearest cent.

The total of payments is the rounded weekly payment multiplied by the number of weekly periods. Total interest is that total minus the original loan amount. Since the weekly payment is rounded to cents, the calculated total interest is an estimate based on making that same rounded payment each week.

Worked Example

Using the calculator’s default inputs—$20,000 borrowed, 8% APR, and a five-year term:

1. Weekly rate: 8 ÷ 5,200 = 0.00153846.
2. Number of payments: 5 × 52 = 260.
3. Payment: 20,000 × 0.00153846 ÷ [1 − (1 + 0.00153846)⁻²⁶⁰] = approximately $92.34 per week.
4. Total of weekly payments: $92.34 × 260 = $24,008.40.
5. Estimated total interest: $24,008.40 − $20,000 = $4,008.40.

The weekly payment is the headline result. The total and interest figures help show the cost across the full modeled term, but the lender may calculate the final schedule differently because of payment dates, rounding, fees, or the contract’s rate conventions.

What a Weekly Payment List Shows

A payment list, sometimes called an amortization schedule, lays out each scheduled payment and how it reduces the balance. A typical loan schedule separates each payment into interest and principal. Early in a fully amortizing loan, more of the payment generally goes toward interest because the balance is larger. As the balance falls, the interest portion falls and more of each payment reduces principal.

This calculator gives summary totals rather than a row for every week. For a full list, a schedule needs the starting balance, exact payment dates, rate calculation rules, and the effect of each payment on the balance. A simple fixed-rate model calculates weekly interest from the outstanding balance and applies the rest of each payment to principal. Actual loan documents may specify different conventions.

How to Use the Estimate

• Enter the amount borrowed, not the total purchase price unless the entire price is financed.
• Enter the APR as a percentage per year. For example, enter 8 for 8%, not 0.08.
• Enter the term in years. A three-year term means 156 weekly payments under the 52-payment convention.
• Compare the result with the payment frequency and amount stated in the lender’s own disclosure or repayment schedule.

For example, a $15,000 loan with a four-year term would use 208 weekly periods. The rate must still come from the loan offer or contract; the example rate in the calculator is only an input for illustrating the arithmetic, not a claim about available rates.

Weekly Payments Compared with Monthly Payments

Weekly and monthly payment amounts are not directly comparable by looking at one payment alone: there are about 52 weekly payments but only 12 monthly payments in a year. A rough annual cash-flow comparison multiplies the weekly payment by 52 and the monthly payment by 12. The exact total cost also depends on the rate conversion and when payments are credited.

Do not assume that paying weekly automatically shortens a loan or saves a fixed amount of interest. A payment schedule with 52 installments differs from making 12 monthly installments, and some advertised “weekly” arrangements may collect money weekly while crediting it to the loan less often. Check the agreement for the actual credited payment dates, frequency, and any fees. This calculator models payments credited once each week.

Assumptions

• The interest rate is fixed for the entire modeled term.
• Payments are equal, made once per week, and credited at the end of each weekly period.
• There are 52 payment periods per year, with a periodic rate calculated as APR divided by 52.
• The calculator does not include fees, taxes, insurance, PMI, escrow, late charges, or changes to the rate or payment.
• The result is not a lender’s payoff quote or contractual amortization schedule.

Common Issues and Limits

A common mistake is confusing APR with the weekly rate. The APR is entered as a yearly percentage; the formula converts it into a weekly decimal rate. Another is treating 52 weeks as exactly the same timing as 12 calendar months. Calendar dates do not divide neatly into identical 52-week years, and a lender may use specific date and day-count conventions.

Rounding also matters. The calculator rounds the regular payment to cents, then multiplies that rounded amount by all scheduled payments to estimate the total. In a real schedule, the final payment may be adjusted by a few cents to clear the remaining balance. Fees financed into the loan should be included in the amount borrowed if you want them reflected in this simple estimate; fees paid separately are not represented.

This is a fixed-payment calculation, not a complete assessment of a loan’s cost or suitability. It does not model skipped payments, extra principal payments, variable rates, grace periods, or a final balloon amount. Get the actual APR, fees, payment dates, and schedule from the lender rather than treating a sample calculation as an offer.

Frequently Asked Questions

What is a weekly payment list?
A weekly payment list is a schedule showing payments due each week, often with the amount assigned to interest and principal and the balance remaining after each payment.

How do I calculate a weekly loan payment?
Convert the APR to a weekly rate by dividing by 5,200, set the number of payments to years × 52, then apply the level-payment formula shown above.

Is a weekly payment the same as paying monthly in weekly installments?
Not necessarily. The result depends on whether each weekly amount is credited to the loan weekly or collected and credited on another schedule. Check the loan terms.

Does paying weekly always reduce interest?
No. The effect depends on when payments are credited, how interest accrues, and the loan terms. A weekly collection arrangement does not necessarily mean weekly principal reduction.

Why is my lender’s payment different?
The lender may use a different rate convention, exact calendar dates, fees, a different payment count, or rounding rules. Its disclosure and repayment schedule provide the contract-specific figures.

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 | Weekly payment | $ | p * (apr / 5200) / (1 - (1 + apr / 5200) ^ -(yrs * 52)) | 2
out tot | Total of weekly payments | $ | pmt * yrs * 52 | 2
out int | Total interest | $ | tot - p | 2