Weekly Loan Calculator

Weekly loan payments compress your payment schedule from 12 payments per year to 52 — which equals 13 monthly payments annually. That extra payment goes entirely toward principal, reducing your loan balance faster than the interest can compound. The math works because interest accrues daily on your remaining balance, so every dollar of principal you pay early saves interest for the remaining loan term.

This calculator converts your annual interest rate to a weekly rate (annual rate ÷ 52 weeks) and calculates payments using the standard amortization formula. Each weekly payment splits between principal and interest, with more going toward principal as your balance decreases. The key assumption is that you make payments every week for the full term — no missed or late payments.

The time savings compound dramatically over long terms. A 30-year mortgage becomes roughly 26 years with weekly payments, because that extra annual payment attacks the principal when compound interest has the most time to work against you. The earlier you start weekly payments, the more dramatic the savings become.

Weekly payments work best for borrowers with steady weekly income who want to pay off loans faster without refinancing. This includes salaried employees, contractors with regular weekly billing, or anyone with predictable cash flow who can handle 52 payment dates per year instead of 12.

Avoid weekly payments if you have irregular income, tight monthly budgets, or existing cash flow problems. The frequency increases your risk of missed payments, and the total annual outlay is higher despite interest savings. Consider bi-weekly payments as a middle ground — they capture most of the benefit with half the payment frequency.

Weekly payments shine most on long-term, high-balance loans where compound interest has time to work against you. A 30-year mortgage benefits more than a 3-year car loan. The absolute dollar savings depend on your balance and rate, but the percentage savings remain consistent across loan types.

The biggest mistake is assuming weekly payments mean smaller payments — they don't. If your monthly payment would be $1,800, your weekly payment is roughly $415, which equals $1,660 per month. You pay $140 less monthly but make 52 payments instead of 12, adding up to more annual cash outflow.

Many borrowers underestimate cash flow impact. Weekly payments require consistent income every week, not just monthly salary deposits. If you're paid biweekly or monthly, budget carefully to avoid overdrafts between paychecks. Missing even one weekly payment can trigger late fees that eliminate interest savings.

Don't ignore prepayment penalties or processing fees. Some lenders charge $3-10 per weekly payment, adding $156-520 annually. Others classify frequent payments as loan modifications, triggering origination fees. Read your loan agreement before switching from monthly to weekly payments — the math only works if the lender doesn't penalize the change.

The weekly payment formula is P × [r(1+r)^n] / [(1+r)^n-1], where P is principal, r is weekly interest rate (annual rate ÷ 52), and n is total weeks (years × 52). For a $300,000 loan at 6% annually, the weekly rate becomes 6% ÷ 52 = 0.115%. Over 30 years (1,560 weeks), this produces a weekly payment of $449.04.

The acceleration comes from payment frequency, not rate reduction. With monthly payments, interest compounds 12 times per year. With weekly payments, you attack the principal balance 52 times per year, reducing the amount that compounds. Each extra payment is 100% principal since you've already covered the interest portion.

Edge cases matter for comparison shopping. If your lender charges weekly payment processing fees above $5 per payment, monthly payments may cost less overall. Some adjustable-rate loans reset based on payment frequency, potentially raising your rate with weekly payments. Always calculate total cost including fees, not just interest savings.

Lenders often resist weekly payment setups because they reduce loan profitability and increase servicing costs. Many will agree to bi-weekly payments (26 per year) but charge fees for true weekly payments (52 per year). The industry standard is to require automatic ACH withdrawal for weekly schedules, giving the lender guaranteed cash flow while reducing their processing overhead.