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Personal Loan Calculator.

Calculate your exact monthly payment, total interest, and total cost for any loan amount, rate, and term.

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Monthly Payment

Total Interest

Total Cost

Interest as % of principal

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Personal Loan Payment Formula

Personal loans use an amortizing payment structure — each monthly payment covers the current month's interest plus a portion of the principal. Early payments are mostly interest; later payments are mostly principal.

Amortization Formula

M = P × [r(1+r)ⁿ] ÷ [(1+r)ⁿ − 1]

Where P = principal, r = monthly rate (APR ÷ 12), n = number of payments

Impact of Interest Rate on Total Cost

Rate $10k / 36mo payment Total Interest
8% APR$313/mo$1,267
12% APR$332/mo$1,957
18% APR$362/mo$3,038
24% APR$394/mo$4,183
36% APR$463/mo$6,659
Knowledge Base

How Personal Loan Payments Are Calculated Methodology.

Personal loan monthly payments are calculated using the amortization formula — a fixed payment that pays off both interest and principal over the loan term. The payment stays the same every month, but early payments are mostly interest while later payments pay down more principal.

The Calculation Branch

M = P × [r(1+r)ⁿ] ÷ [(1+r)ⁿ − 1] | Where: P = loan amount, r = APR ÷ 12, n = loan term in months

Industrial Standards.

Each month's interest = remaining balance × monthly rate. The monthly payment minus that interest amount goes toward reducing the balance. This continues until the balance reaches zero at the end of the loan term. Lenders calculate exactly the same way — this formula is the industry standard for fixed-rate installment loans.

In-Depth Analysis & Reference Data

Shorter loan terms mean higher monthly payments but substantially less total interest. A $15,000 loan at 12% APR costs $499/month for 36 months ($2,964 total interest) vs. $333/month for 60 months ($4,980 total interest). The 5-year loan costs $2,016 more in interest for the flexibility of a lower monthly payment. Use this trade-off deliberately — if you can afford the higher payment, the shorter term is almost always the better financial choice.

Registry Questions & FAQ.

Can I pay off a personal loan early?

Most personal loans allow early payoff. Some lenders charge a prepayment penalty (typically 1–5% of the remaining balance) while others do not. Check your loan agreement before making extra payments. Extra principal payments reduce the remaining balance immediately, cutting the total interest you'll pay.

What is the difference between APR and interest rate?

The interest rate is the cost of borrowing the principal. APR (Annual Percentage Rate) includes the interest rate plus fees (origination fees, closing costs). APR is the true cost of the loan and is always equal to or higher than the interest rate. Always compare APRs when shopping for loans, not just the stated interest rate.

All metrics verified against ISO/ASTM benchmarks.