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Simple Loan Calculator

Basic loan payment calculator

Loan & Mortgage Calculator

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A simple loan calculator computes monthly payments and total interest for a standard installment loan (mortgage, auto loan, personal loan). It uses the standard amortization formula where equal monthly payments cover both principal and interest.

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Tip: Round up your monthly payment. Adding even $50–$100/month to a mortgage can shave years off the term and save thousands in interest with no formal refinancing required.

  1. 1Monthly payment = P × r(1+r)^n / ((1+r)^n − 1)
  2. 2Each payment covers that month's interest first, then reduces principal
  3. 3Total cost = Monthly payment × number of payments
  4. 4Total interest = Total cost − Original principal
$15,000 personal loan, 9% APR, 48 months=$373/month, $2,916 interestTotal cost: $17,916
$250,000 mortgage, 6.5%, 30 years=$1,580/month, $318,753 interestPay 2.3× the loan amount
Loan TypeTypical APRCommon Term
Mortgage (30yr fixed)6.5–7.5%30 years
Mortgage (15yr fixed)6.0–7.0%15 years
Auto loan (new)5.5–8%48–72 months
Personal loan (good credit)8–15%24–60 months
Credit card20–29%Revolving
Student loan (federal)5.5–8.0%10 years (standard)

Fun Fact

In a typical 30-year mortgage, you pay more in interest than you borrowed during the first 18 years. You don't owe more in principal than interest until about month 225 (year 18.75).

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