Personal Loan Calculator
Calculate your monthly personal loan payments, lifetime interest charges, origination fee deductions, and payoff schedule across credit score tiers.
Personal Loan Formula & Credit Score Benchmarks [2026]
Personal loans are unsecured installment loans amortized with fixed monthly payments. Monthly payment size is driven primarily by your credit score, which dictates your approved Annual Percentage Rate (APR).
P = Loan Principal • r = Monthly Rate (APR ÷ 12) • n = Total Repayment Months
- • Excellent (740+): 6.5% – 11.5% APR
- • Good (670–739): 12.0% – 17.5% APR
- • Fair (580–669): 18.0% – 25.5% APR
A 3% fee on $10,000 means $300 is deducted upfront from your wire transfer, delivering $9,700 net cash while interest accrues on the full $10,000.
Loan ParametersReal-time amortization
Personal Loan Amortization Schedule
Monthly payment allocation between principal debt reduction and lender interest.
| Payment Month | Monthly Payment | Principal Paid | Interest Paid | Remaining Balance |
|---|---|---|---|---|
| Month 1 | $325.02 | $237.52 | $87.5 | $9,762.48 |
| Month 2 | $325.02 | $239.6 | $85.42 | $9,522.87 |
| Month 3 | $325.02 | $241.7 | $83.33 | $9,281.17 |
| Month 4 | $325.02 | $243.81 | $81.21 | $9,037.36 |
| Month 5 | $325.02 | $245.95 | $79.08 | $8,791.41 |
| Month 6 | $325.02 | $248.1 | $76.92 | $8,543.31 |
| Month 7 | $325.02 | $250.27 | $74.75 | $8,293.04 |
| Month 8 | $325.02 | $252.46 | $72.56 | $8,040.58 |
| Month 9 | $325.02 | $254.67 | $70.36 | $7,785.91 |
| Month 10 | $325.02 | $256.9 | $68.13 | $7,529.01 |
| Month 11 | $325.02 | $259.15 | $65.88 | $7,269.87 |
| Month 12 | $325.02 | $261.41 | $63.61 | $7,008.46 |
| Month 24 | $325.02 | $290.22 | $34.8 | $3,687.23 |
| Month 36 | $325.02 | $322.21 | $2.82 | $0 |
Personal Loan Repayment Benchmark Matrix (at 10.5% APR)
Compare monthly payments and total interest expenses across standard loan sizes and terms:
| Borrowing Amount | 2 Years (24 mo) | 3 Years (36 mo) | 5 Years (60 mo) | 3-Yr Lifetime Interest |
|---|---|---|---|---|
| $5,000 | $232 / mo | $163 / mo | $107 / mo | $851 |
| $10,000 | $464 / mo | $325 / mo | $215 / mo | $1,701 |
| $20,000 | $928 / mo | $650 / mo | $429 / mo | $3,401 |
| $35,000 | $1,623 / mo | $1,138 / mo | $751 / mo | $5,952 |
| $50,000 | $2,319 / mo | $1,625 / mo | $1,075 / mo | $8,503 |
Frequently Asked Questions About Personal Loans
What is the mathematical formula for personal loan payments?↓
Personal loans use the standard amortization formula: M = P × [r(1 + r)^n] ÷ [(1 + r)^n − 1], where M is monthly payment, P is principal borrowed, r is monthly interest rate (APR / 12), and n is total monthly payments (years × 12). For example, a $10,000 loan at 10.5% APR over 36 months requires a payment of $325.02 per month.
What is a good personal loan interest rate in 2026?↓
In 2026, average personal loan rates range between 7.5% and 24.5% depending on credit profile: Excellent Credit (740+) averages 7.5%–11.5%, Good Credit (670–739) averages 12.0%–17.5%, Fair Credit (580–669) averages 18.0%–25.5%, and Bad Credit (<580) averages 26.0%–35.9%.
How do lender origination fees work?↓
An origination fee (typically 1% to 8%) is an upfront administrative fee charged by online lenders and banks. Most lenders deduct this fee directly from your wire transfer. For example, on a $10,000 loan with a 5% ($500) origination fee, you receive $9,500 in cash, but your monthly repayment schedule is based on the full $10,000 loan amount.
Can I pay off my personal loan early without penalties?↓
Yes. Almost all major online personal loan lenders (e.g. SoFi, Marcus, Discover, Upgrade) charge 0% prepayment penalty fees. Because interest compounds on the remaining balance daily, paying extra principal each month directly reduces lifetime interest and shortens your debt-free date.
How much are monthly payments on a $20,000 personal loan?At 10.5% APR, monthly payments on a $20,000 personal loan are approximately: 3 Years (36 months) = $650/mo ($3,401 total interest); 5 Years (60 months) = $429/mo ($5,790 total interest); 7 Years (84 months) = $338/mo ($8,392 total interest).
Authored by Arham Bilal
Formulas verified against Federal Reserve Consumer Credit guidelines, Truth in Lending Act (TILA) disclosure standards, and institutional banking APR amortization schedules.
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