Number of Payments Formula:
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Definition: This calculator determines how many payments are needed to pay off a loan based on the current balance, monthly payment amount, and interest rate.
Purpose: It helps borrowers understand how long it will take to pay off their current loan balance under the current payment terms.
The calculator uses the formula:
Where:
Explanation: The formula calculates how many periods are needed to amortize the current loan balance given the fixed payment amount and interest rate.
Details: Knowing the remaining payments helps with financial planning, budgeting, and deciding whether to refinance or make additional payments.
Tips: Enter your current monthly payment, remaining loan balance, and monthly interest rate (annual rate ÷ 12). All values must be > 0 and rate must be < 1.
Q1: How do I convert annual rate to monthly?
A: Divide your annual percentage rate (APR) by 12 (e.g., 6% APR = 0.06/12 = 0.005 monthly rate).
Q2: What if my payment doesn't cover the interest?
A: The formula won't work if M ≤ B×r (negative logarithm). This means your balance would grow over time.
Q3: Does this include extra payments?
A: No, this calculates based on your current fixed payment amount only.
Q4: Why does the result have decimal places?
A: The calculation may show partial payments. Round up to the next whole payment for the actual payoff date.
Q5: How accurate is this calculation?
A: It's mathematically precise for fixed-rate loans with constant payments, assuming no additional fees or changes.