What This Tool Does
This business loan calculator applies the standard fixed-payment amortization formula to compute periodic payments, total interest, origination fees, and effective APR across four loan types: term, SBA, equipment, and line of credit. It supports monthly, bi-weekly, and weekly frequencies and models the impact of extra payments — giving you a complete cost picture that most simple payment calculators leave out.
How to Get Accurate Results
- Enter the actual disbursed amount, not the approved credit limit. If your lender deducts the origination fee upfront, enter the net amount you receive to get an accurate payment schedule.
- Use the origination fee field to capture all upfront costs. Compare the effective APR output — not just the stated interest rate — when evaluating competing loan offers.
- Model extra payments to see how even modest additional principal reduces total interest. Confirm with your lender that no prepayment penalty applies before committing to this strategy.
Methodology
The core formula is Payment = P × [r(1+r)^n] / [(1+r)^n − 1], where P is the loan principal, r is the periodic interest rate (annual rate divided by periods per year), and n is total payments. Each amortization row splits the payment into interest (current balance × r) and principal (payment minus interest). Extra payments reduce the balance immediately, recalculating subsequent interest charges downward. Origination fee is added to total cost, and effective APR is derived by finding the rate that equates net loan proceeds to the present value of all payments. The amortization schedule displays the first 60 periods so you can verify the interest-principal split at any point in the loan life.
Real-World Application
CFOs preparing board presentations use this calculator to model multiple financing scenarios side by side. By comparing a 5-year SBA loan at 6.5% with a 3-year equipment loan at 8%, they can present the total cost difference and cash-flow impact per period to justify the optimal borrowing structure.
Frequently Asked Questions
How is the business loan payment calculated?
The calculator uses the standard amortization formula: P × [r(1+r)^n] / [(1+r)^n − 1], where P is the principal, r is the periodic interest rate, and n is the total number of payment periods. This gives you a fixed payment that covers both interest and principal over the full term.
What is an origination fee on a business loan?
An origination fee is a one-time charge the lender deducts upfront for processing the loan. It is typically 0.5%–5% of the loan amount. This calculator adds the origination fee to your total cost so you can see the full price of borrowing.
What is the difference between interest rate and APR?
The interest rate is the annual cost of borrowing the principal. APR (Annual Percentage Rate) includes the interest rate plus fees such as origination costs, giving a broader view of the true annual cost. This calculator estimates an effective APR by spreading fees over the loan term.
How does an extra payment reduce my loan?
Any amount paid above the required periodic payment goes directly toward the principal. This reduces the balance faster, which means less interest accrues each period. The calculator shows how extra payments shorten your payoff timeline.
What types of business loans does this calculator support?
You can model term loans, SBA loans, equipment financing, and lines of credit. While all use the same amortization math, selecting the loan type helps you label and compare scenarios relevant to your business needs.
Can I use this calculator for a weekly or bi-weekly payment schedule?
Yes. Switch the payment frequency to weekly or bi-weekly. The calculator adjusts the periodic rate and total number of periods accordingly. More frequent payments reduce your average balance slightly, which can lower total interest.
Does this tool store any of my data?
No. All calculations run entirely in your browser. Nothing is sent to a server or stored anywhere. Your loan figures remain completely private.
About the Creator
Tool developed by Tyler, founder of ToolVault. Building professional-grade web utilities since 2025 to help creators and business owners make data-driven decisions. This tool is designed for private, browser-based accuracy.