Business Loan Calculator
Calculate monthly payments, total interest, and effective cost for term loans, SBA loans, and lines of credit.
Results
Visualization
How It Works
The Business Loan Calculator helps you understand the true cost of borrowing by calculating your monthly payment, total interest paid, and effective cost across different loan types including term loans, SBA loans, and lines of credit. This matters because business owners need to compare loan options accurately and budget for debt service before committing to financing. This tool is designed for both quick estimates and detailed planning scenarios. Results update instantly as you adjust inputs, making it easy to compare different approaches and understand how each variable affects the outcome. For best accuracy, use precise measurements rather than rough estimates, and consider running multiple scenarios to establish a realistic range of expected results.
The Formula
Variables
- P — Principal or Loan Amount — the total dollars you're borrowing from the lender
- r — Monthly Interest Rate — your annual percentage rate (APR) divided by 12 to get the monthly rate used in calculations
- n — Total Number of Payments — the loan term in years multiplied by 12 (for monthly payments)
- Loan Type — Category of business debt (term loan, SBA loan, or line of credit) — affects how interest accrues and is calculated
- Total Interest — The sum of all interest charges over the life of the loan — the cost of borrowing money
- Effective Cost — The true percentage cost of the loan relative to the amount borrowed, accounting for interest paid over time
Worked Example
Let's say you're applying for a $50,000 term loan at 8% annual interest over 5 years. The calculator first converts the annual rate to a monthly rate: 8% ÷ 12 = 0.667% per month, or 0.00667 as a decimal. Using the payment formula, your monthly payment would be approximately $1,010. Over 60 months, you'd pay $60,600 total ($1,010 × 60), meaning your total interest is $10,600. The effective cost is $10,600 ÷ $50,000 = 21.2% over the 5-year loan period. This tells you that beyond the advertised 8% rate, the true cost of this loan is over 21% when viewed as a percentage of principal.
Practical Tips
- Always compare the effective cost percentage between loan types, not just the monthly payment — a longer term reduces your monthly payment but increases total interest paid significantly
- For SBA loans, factor in any upfront fees or guarantee fees (typically 1-3.75% of the loan amount) — these should be added to your principal or considered separately in your true cost analysis
- Use this calculator to test different loan terms (e.g., 3 years vs. 5 years vs. 7 years) and see how each affects cash flow and total interest; the right choice depends on your business's profitability and growth projections
- If comparing a term loan to a line of credit, remember that lines of credit usually have variable rates that can change — use your current rate as a baseline and stress-test with higher rates to prepare for worst-case scenarios
- Document your loan assumptions (amount, rate, term, type) before applying — this calculator output serves as a benchmark to verify you're getting the quoted rate when papers are actually signed
Frequently Asked Questions
What's the difference between a term loan and a line of credit?
A term loan gives you a lump sum upfront that you repay in fixed monthly payments over a set period, with a fixed or predetermined interest rate. A line of credit is like a credit card — you borrow what you need, pay interest only on the amount used, and typically have a variable rate that can change. Term loans offer payment predictability; lines of credit offer flexibility but carry rate uncertainty.
Why does my effective cost percentage seem higher than my interest rate?
The effective cost is not the same as the interest rate. The interest rate (e.g., 8%) is applied to your balance each month, and the total interest you pay over the full loan term ends up being a significant percentage of your original loan amount. The effective cost calculator shows this total interest as a percentage of principal, giving you a clearer picture of true borrowing cost.
Are SBA loans cheaper than conventional term loans?
SBA loans often have lower interest rates and longer terms than conventional loans, which reduces your monthly payment and can lower your total interest cost. However, they include guarantee fees (paid to the Small Business Administration) that add to your total cost. It's crucial to include these upfront fees in your calculator to make a fair comparison with conventional lenders.
How does the loan term affect how much interest I'll pay?
Longer loan terms spread payments over more months, lowering your monthly payment but increasing total interest because you're paying interest for more years. For example, a $50,000 loan at 8% costs roughly $10,600 in interest over 5 years but approximately $19,000 over 10 years. Always balance affordable monthly payments with the total cost of capital.
Can I use this to compare different lenders' offers?
Yes — this calculator is ideal for comparing lenders. Enter the same loan amount, term, and interest rate from each lender, and you'll see the monthly payment and total cost side by side. Make sure to account for any origination fees, prepayment penalties, or other costs that different lenders charge, as these affect your true effective cost.
Sources
- U.S. Small Business Administration — Loans & Grants
- Federal Reserve — Consumer Credit and Business Lending Guides
- SCORE — Free Business Mentoring and Resources
- Investopedia — Business Loan
- Consumer Financial Protection Bureau — Loan Comparison Tool Guide