Weekly Payment Schedule Calculator

This calculator estimates a loan’s weekly payment from the amount borrowed, annual percentage rate (APR), and repayment term in years. It returns the level weekly payment and estimated total interest, assuming a fixed rate and 52 equal payments per year.

Formula

The calculator treats the annual APR as a nominal rate divided into 52 weekly periods. It calculates a level payment that amortizes the principal over the full number of weekly payments:

• Weekly rate, r = APR ÷ 5,200, where APR is entered as a percentage number (for example, 8 for 8%).
• Number of payments, n = loan term in years × 52.
• Weekly payment = P × r ÷ [1 − (1 + r)⁻ⁿ], rounded to the nearest cent.
• Total interest = rounded weekly payment × n − P.

P is the starting loan principal in dollars, r is the weekly rate as a decimal, and n is the number of weekly payments. The interest total uses the displayed, cent-rounded payment, so it reflects the calculator’s regular-payment estimate. Real lenders may adjust the final payment to clear any small rounding balance.

Worked Example

Using the default inputs—$20,000 principal, 8% APR, and a five-year term:

1. Weekly rate: 8 ÷ 5,200 = 0.0015384615.
2. Payment count: 5 × 52 = 260 weeks.
3. Weekly payment: $20,000 × 0.0015384615 ÷ [1 − (1.0015384615)⁻²⁶⁰] = approximately $93.31.
4. Total interest using the rounded payment: $93.31 × 260 − $20,000 = $4,260.60.

The results are an estimated weekly payment of $93.31 and estimated total interest of $4,260.60.

Assumptions

• The interest rate stays fixed for the whole repayment period.
• Payments are equal, made once every week, with the first payment one week after the loan begins.
• Interest compounds weekly at the APR divided by 52. This is a simplifying convention; an actual contract may use different day-count or accrual details.
• The estimate excludes fees, taxes, insurance, PMI, escrow, late charges, and any other amounts not entered.

What a Weekly Schedule Means

A weekly payment schedule means the borrower makes one scheduled payment each week rather than one payment each month. Each regular payment includes interest accrued for the period and a portion that reduces principal. Early in repayment, interest generally makes up a larger share; as the balance falls, more of each level payment goes toward principal.

“Weekly” is not always the same as “every seven days” in a lender’s operational calendar. A contract may specify a due day, payment processing rules, or a schedule based on actual dates. There are 52 weeks in the calculator’s year, so it models 260 payments over five years. Calendar years are not exactly 52 weeks: a lender’s dates and final payment can lead to a slightly different number or size of payments.

How to Use and Read the Estimate

Enter the amount financed—not necessarily the price of an item—and the APR and term stated in the loan documents or quote. APR is entered as a percentage, so enter 8 for 8%, not 0.08. The term is in years; for a 30-month term, enter 2.5 years. The output is a mathematical estimate, not a payment notice or lender offer.

To interpret the outputs, the weekly payment is the regular installment under the assumptions above. Total interest is the estimated amount paid above the original principal across all modeled installments. It is not the total amount repaid: add principal to interest to estimate that total. For the example, $20,000 + $4,260.60 = $24,260.60.

If you have an actual payment quote, compare it only after checking that the principal, APR, term, payment frequency, and included charges match. A payment can differ because of fees added to the balance, a variable rate, a balloon payment, irregular first or final periods, or a different calculation convention.

Weekly Versus Monthly Payments

A weekly schedule divides repayment into smaller, more frequent installments. It does not automatically mean the borrower pays less interest than with monthly installments. The result depends on the exact payment amounts, timing, rate calculation, and whether the weekly amount is simply one-quarter of a monthly payment or is calculated to repay the loan over 52 installments each year.

For instance, 52 weekly payments of $100 total $5,200 per year. Paying $400 once per month totals $4,800 over 12 months. Those schedules do not pay the same annual amount, so comparing their interest totals without accounting for payment size can be misleading. This calculator produces a level weekly payment for the term; it does not convert an existing monthly bill or model a lender’s special payment plan.

Common Sources of Difference

• APR and rate conventions: APR can include certain borrowing costs in its disclosure, while the interest accrual method in a contract may not match this simplified weekly-rate formula.
• Rounding: This estimate rounds each regular payment to cents. A lender may recalculate or alter the final installment to bring the balance to zero.
• Payment dates: Actual days between payments, holidays, processing dates, or a first payment due sooner or later than one week can change accrued interest.
• Changing terms: Variable rates, skipped or extra payments, refinancing, and fees added later are not included in the level-payment model.
• Frequency confusion: Weekly means 52 modeled installments per year here; fortnightly or biweekly usually means 26 installments, a different schedule.

Frequently Asked Questions

How do I calculate a weekly loan payment?
Convert the APR to a weekly decimal rate by dividing the percentage rate by 5,200, multiply the term in years by 52 for the number of payments, then apply the amortizing-payment formula shown above.

Does paying weekly reduce total interest?
Not necessarily. It depends on the amount and timing of payments and the lender’s interest method. A weekly schedule with more paid per year can reduce the balance sooner, but this calculator does not compare contract-specific plans.

Is weekly the same as biweekly?
No. Weekly means one payment each week, or 52 modeled payments per year. Biweekly means one payment every two weeks, normally 26 payments per year; the payment amount and schedule need a separate calculation.

Does this include fees or insurance?
No. The estimate uses principal, APR, and term only. Check the lender’s payment disclosure for any fees, insurance, taxes, or other charges that apply.

Why might my lender’s payment be different?
The lender may use actual calendar dates, a different compounding or day-count convention, a variable rate, a different payment count, or charges excluded from this estimate. The loan documents specify the contractual schedule.

This result is an estimate for educational purposes, 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 | $ | round(p * (apr / 5200) / (1 - (1 + apr / 5200) ^ -(yrs * 52)), 2) | 2
out int | Total interest | $ | pmt * yrs * 52 - p | 2