Business Loan Calculator

What Is a Business Loan Calculator?

Access to capital is one of the most critical factors in business growth. Whether you need funding to purchase equipment, hire staff, expand inventory, or acquire commercial real estate, a business loan calculator helps you evaluate financing options before you apply. It shows what a loan will actually cost in monthly payments and total interest, and whether your business revenue can comfortably support the debt.

In 2026, small business lending is experiencing a notable shift. The average SBA 7(a) loan rate dropped to 9.49% in Q1 2026, the lowest quarterly average since 2022 and the fifth straight quarter of declines, according to SBA FOIA data analyzed by smbquotes.com. The WSJ Prime Rate stands at 6.75% as of July 2026, and the SBA introduced new alternative base rates (SOFR and Treasury notes) effective March 1, 2026, giving lenders and borrowers more flexibility in rate structures. Fiscal year 2025 was a record year for the SBA 7(a) program, with 78,078 loans approved totaling $37.3 billion.

Understanding the numbers before speaking to a lender puts you in a stronger negotiating position and helps you avoid taking on more debt than your cash flow can handle. For personal financing needs, see our Loan Calculator or Auto Loan Calculator.

What This Calculator Does

This calculator estimates monthly loan payments, total repayment cost, total interest, origination fee impact, and key affordability metrics including the Debt Service Coverage Ratio (DSCR) and annual debt as a percentage of revenue.

Inputs Required

• Loan Type Preset: Select from SBA 7(a), SBA 504, Term Loan, Line of Credit, or Equipment Loan to auto-fill typical rates and terms
• Loan Amount: The total amount you intend to borrow
• Interest Rate: The annual interest rate quoted by the lender
• Loan Term: The repayment period in years
• Origination Fee: An upfront fee charged by many lenders, expressed as a percentage of the loan amount
• Annual Revenue: Your business's gross annual revenue, used to calculate the DSCR

Outputs Provided

• Monthly Payment: The fixed amount due to the lender each month
• Total Repaid: The sum of all monthly payments over the loan term
• Total Interest: Interest paid above the principal borrowed
• Debt Service Coverage Ratio: How many times over your revenue covers annual loan payments
• Annual Debt as % of Revenue: The portion of annual revenue committed to loan repayment
• Cost Breakdown Chart: A pie chart showing principal, interest, and fee proportions

How the Calculation Works

Monthly payments are calculated using the standard amortization formula applied to the total financed amount, which includes the loan principal plus any origination fee.

The Debt Service Coverage Ratio (DSCR) measures how well your business income covers its debt obligations:

Lenders typically require a DSCR of at least 1.25x, meaning your revenue must be 25% more than your total annual loan payments. A DSCR below 1.0x means the business cannot cover its payments from current revenue alone. Note that this calculator uses gross revenue as a simplified proxy. Lenders typically use net operating income (revenue minus operating expenses) for DSCR, which produces a more conservative and accurate picture.

How to Use the Calculator

1. Select a loan type preset to populate typical rate and term parameters, or enter your own
2. Enter the loan amount you need
3. Adjust the interest rate and loan term to match the offer you are evaluating
4. Enter the origination fee percentage if applicable (common range is 1% to 3% for SBA and bank loans, up to 5% for alternative lenders)
5. Enter your annual business revenue to calculate DSCR and debt-to-revenue ratio
6. Review the monthly payment, total cost, and business metrics to assess affordability
7. Compare multiple scenarios by changing the rate or term to see how they affect total cost

Current SBA Loan Rates (July 2026)

SBA loan rates are tied to base rates plus a lender spread. As of July 2026, the WSJ Prime Rate is 6.75%. The SBA also introduced alternative base rates effective March 1, 2026, including 30-Day SOFR (3.68%), 5-Year Treasury (4.19%), and 10-Year Treasury (4.44%). The SBA Optional Peg Rate increased to 4.75% for Q3 2026.

SBA 7(a) Maximum Rates

• Variable rate, $50,000 or less: Prime + 6.5% = 13.25%
• Variable rate, $50,001-$250,000: Prime + 6.0% = 12.75%
• Variable rate, $250,001-$350,000: Prime + 4.5% = 11.25%
• Variable rate, $350,001+: Prime + 3.0% = 9.75%
• Fixed rate, up to $25,000: Prime + 8.0% = 14.75%
• Fixed rate, $25,001-$50,000: Prime + 7.0% = 13.75%
• Fixed rate, $50,001-$250,000: Prime + 6.0% = 12.75%
• Fixed rate, $250,001+: Prime + 5.0% = 11.75%

These are maximums. Your actual rate depends on the lender, your credit profile, and business financials. In Q1 2026, the average SBA 7(a) loan rate was 9.49%, with variable-rate loans averaging 9.64% and fixed-rate loans averaging 8.43%. The spread between lenders can be as wide as 4.5 percentage points, so comparing offers from multiple lenders is critical.

SBA 504 Effective Rates (July 2026)

• 10-year term: 6.19% (fixed for life of loan)
• 20-year term: 6.20% (fixed for life of loan)
• 25-year term: 6.17% (fixed for life of loan)

Example Calculations

Example 1: SBA 7(a) for Restaurant Expansion

Carlos, a restaurant owner in Miami, borrows $150,000 via an SBA 7(a) loan at 9.49% (the Q1 2026 average) over 10 years with a 2% origination fee and annual revenue of $600,000:

• Total Financed: $150,000 + $3,000 fee = $153,000
• Monthly Payment: approximately $1,959
• Annual Debt Service: $1,959 x 12 = $23,508
• Total Interest Over 10 Years: approximately $81,708
• DSCR: $600,000 / $23,508 = 25.5x (well above the 1.25x threshold)

Carlos's rate of 9.49% saves him approximately $25,000 in interest compared to the 2024 peak average of 11.18%. The SBA 7(a) program approved over 8,250 loans to full-service restaurants in FY2024-2026, making it the most common industry for SBA lending.

Example 2: Equipment Loan for Manufacturing

A manufacturing business in Ohio needs $80,000 in new machinery. Using the Equipment Loan preset at 8.5% over 7 years, the calculator shows a monthly payment of $1,244 and total interest of $24,296. The DSCR on $400,000 annual revenue is 26.8x, comfortably above lender requirements. The equipment itself serves as collateral, which helps secure a lower rate than an unsecured term loan.

Example 3: Comparing Lender Offers

A startup in Austin receives two offers for $50,000: Lender A at 10% over 5 years, Lender B at 8.5% over 3 years. Lender A costs $1,062/month and $13,720 total interest. Lender B costs $1,577/month but only $6,772 in interest. The calculator makes the tradeoff between monthly cash flow and total cost immediately clear. The business chooses Lender A because the lower monthly payment preserves cash flow for operations, even though total interest is higher.

Real World Scenarios

Small Business Expansion

A retail store in Denver with $250,000 revenue wants to open a second location and needs $200,000. A 5-year term loan at 9% produces a monthly payment of $4,152 and a DSCR of 5.0x. The business can service the debt, though annual debt payments consume about 20% of revenue, which is within acceptable limits. The owner uses this calculator to test whether a 7-year term at the same rate would be safer, finding the payment drops to $3,224 but total interest increases from $49,120 to $70,816.

Using Alternative Base Rates

Starting March 1, 2026, SBA lenders can use SOFR or Treasury note rates as base rates instead of Prime. A borrower in Seattle taking a $400,000 SBA 7(a) loan might find a lender offering SOFR + 3% = 6.68%, compared to Prime + 3% = 9.75%. On a 10-year loan, the SOFR-based rate saves approximately $67,000 in interest. However, SOFR is a floating rate that can increase, while the Prime-based option may have a fixed-rate structure. Always ask lenders about alternative base rate options and compare the total cost across the full loan term.

Why This Calculation Matters

Taking on more debt than a business can service is a leading cause of small business failure. Lenders assess DSCR precisely because it predicts whether a borrower can make payments without financial distress. In FY2025, the SBA approved a record 78,078 7(a) loans totaling $37.3 billion, and Q1 2026 kept pace with 16,114 approvals. With rates at their lowest point in two years, more businesses are accessing capital, making it critical to understand what you can truly afford before signing.

The biggest lever on your rate is not the market. It is which lender you choose. Across the highest-volume SBA 7(a) lenders in FY2024-2026, average rates spanned from 8.34% (Bank of America) to 12.78% (BayFirst National Bank), a gap of 4.44 percentage points. On a $300,000 loan over 10 years, that difference amounts to over $90,000 in interest. Always compare offers from multiple lenders before committing.

Common Mistakes to Avoid

• Borrowing based on maximum approval amount: Lenders approve based on creditworthiness, not necessarily on what is operationally wise. Just because you qualify for $500,000 does not mean that level of debt is appropriate for your cash flow
• Ignoring origination fees: A 2% origination fee on a $200,000 loan adds $4,000 to the financed amount immediately. Factor all fees into the true cost of the loan before comparing offers. Some lenders advertise no-fee loans but offset this with higher interest rates
• Using revenue instead of net operating income for DSCR: This calculator uses revenue as a simplified proxy. Lenders typically use net operating income (revenue minus operating expenses) for DSCR, which produces a more conservative and accurate picture. Your actual DSCR may be significantly lower than what the calculator shows
• Selecting the longest term by default: Longer terms reduce monthly payments but dramatically increase total interest paid. On a $200,000 loan at 9.49%, a 10-year term costs $81,708 in interest while a 7-year term costs $55,560. Choose the shortest term your monthly cash flow can comfortably support
• Not comparing multiple lenders: The rate spread between SBA 7(a) lenders can exceed 4 percentage points. Failing to get quotes from at least 3 lenders can cost you tens of thousands of dollars in interest over the loan term
• Overlooking alternative base rates: Since March 2026, lenders can offer SOFR or Treasury-based rates that may be significantly lower than Prime-based rates. Ask every lender about all available base rate options

Limitations of This Calculator

This calculator provides an estimate based on the inputs you enter. It does not account for variable rate changes over the loan term, balloon payments, prepayment penalties, or SBA guarantee fees (typically 2-3.75% of the guaranteed portion). The DSCR calculation uses gross revenue rather than net operating income, which overstates the ratio compared to what most lenders calculate. For a complete picture, compare results with actual loan offers from multiple SBA-approved lenders. If you need to calculate return on investment for a specific project, use our ROI Calculator.

Authoritative Research & Resources

• SBA - Loan Programs - The U.S. Small Business Administration's official loan programs page provides current rate structures, eligibility requirements, and a lender matching tool. The SBA 7(a) program is the flagship general-purpose loan, offering up to $5 million with terms up to 10 years (25 years for real estate).
• Lendio - Current SBA Loan Interest Rates (July 2026) - Lendio publishes monthly SBA rate updates including Prime Rate, SOFR, Treasury yields, SBA Optional Peg Rate, and 504 debenture rates. Their July 2026 report confirms Prime at 6.75% and SBA 504 effective rates of 6.17-6.20%.
• SMB Quotes - SBA 7(a) Loan Rates Q1 2026 - This analysis of SBA FOIA data shows the average 7(a) loan rate dropped to 9.49% in Q1 2026, the lowest since 2022. Includes lender-by-lender rate comparisons showing a 4.44 percentage point spread between the highest and lowest volume lenders.
• CFPB - Small Business Financing Resources - The Consumer Financial Protection Bureau provides guidance on small business lending, including how to compare loan offers, understand APR vs interest rate, and evaluate financing terms.