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Calculate a weekly payment on a loan when payment is a month away
You'd have to look at the terms of the loan to be sure, but if the interest compounds weekly then you'd have to calculate the effect of 3 compounding periods, then compute for weekly payments. The balance after 3 weeks would be: Using Excel's PMT function for that principal balance, I get a weekly payment of $189.48.   If the interest doesn't compound, the principal balance will be about $8888.37 and the weekly payment would be $189.85. Note, however, that the terms of the loan could be completely customized, so you'd need to be sure that the payment and the amortization schedule make sense to you before you agree to the loan.  Since the interest is very high, I suspect this is a "no credit needed" car loan which are notorious for unfavorable (to the borrower) terms.