How do you calculate principal?
Michael Gray
Updated on March 15, 2026
The principal is the amount of money you borrow when you originally take out your home loan. To calculate your principal, simply subtract your down payment from your home’s final selling price.
How do you calculate principal in Excel?
Excel PPMT Function
- Summary.
- Get principal payment in given period.
- The principal payment.
- =PPMT (rate, per, nper, pv, [fv], [type])
- rate – The interest rate per period.
- The Excel PPMT function is used to calculate the principal portion of a given loan payment.
How is principal repaid calculated?
Subtract the interest owed for the period from your payment on the loan to determine the amount of principal repayment for the period. Finishing the example, if you make a monthly payment of $200, subtract $106.50 of interest to find that you’ve repaid $93.50 of principal.
How do you calculate principal and monthly interest?
Divide your interest rate by the number of payments you’ll make in the year (interest rates are expressed annually). So, for example, if you’re making monthly payments, divide by 12. 2. Multiply it by the balance of your loan, which for the first payment, will be your whole principal amount.
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