How to Use the Business Loan Calculator
- Loan amount. Use the slider or type directly. Start with your best estimate and adjust once you see the results.
- Interest rate or APR. Use a lender quote if you have one. If you are planning ahead, 8–12% covers most standard business loan profiles; the rate table further down shows typical ranges by lender type.
- Loan term. Shorter terms cost less overall; longer terms lower the monthly payment. The term comparison panel updates as you type, so you can see the trade-off without re-entering anything.
- Repayment type. Capital and interest is standard. Interest-only keeps monthly payments lower but the full principal falls due at term end.
- Arrangement fee. Enter as a percentage if your lender has quoted one. It is added to your total cost but does not change the monthly repayment figure.
What Your Business Loan Results Mean
The monthly figure is the one that tends to dominate attention. It should not be. Each number in the results panel tells you something different, and focusing only on the monthly payment is how businesses end up accepting a longer term than they need and paying significantly more overall.
Monthly repayment. The amount your business would pay each month on these terms. This is what has to fit within your actual monthly cash flow, not your average month. If the figure looks tight, extending the term will bring it down. But do check the total interest figure before you do: a longer term might save you £200 a month and cost you £6,000 over the life of the loan.
Total interest. What borrowing costs above the amount you borrowed. This is the number that tells you whether a lower monthly repayment is genuinely better value or just spread over more time. Two offers can have almost identical monthly figures and very different total interest costs if the terms or rates differ.
Total fees. Any arrangement, setup, or broker fee you have entered, shown as a pound amount rather than a percentage. Some lenders roll this into the loan balance, which increases your monthly repayment slightly. Others take it upfront. Either way, it is real money out, and the calculator surfaces it so you can include it when comparing offers side by side.
Total amount repayable. The full estimated cost: capital, interest, and fees combined. This is the comparison figure that matters most. A loan with a lower monthly repayment can cost substantially more overall if the term is longer or the rate is higher. Use this number, not the monthly figure, when you are deciding between offers.
Affordability. The calculator does not tell you whether your business can afford the loan. That requires you to weigh the monthly repayment against your actual revenue, fixed costs, and expected cash flow in a weaker trading period. The affordability checklist further down this page is a practical way to work through it before you commit.
Business Loan Repayment Formula
For a standard capital and interest loan, the monthly repayment follows the amortization formula below. The calculator uses this exact formula, so if you want to verify a figure manually or understand where the number comes from, this is the arithmetic behind it.
For example, on a £25,000 loan at 8% over 3 years:
- r = 8% ÷ 12 = 0.667% per month (0.00667)
- n = 3 × 12 = 36 monthly payments
- Monthly repayment = £25,000 × 0.00667 × (1.00667)36 ÷ ((1.00667)36 − 1) = £783
The formula gives you equal monthly payments across the full term. What changes month by month is the split: early on, a larger share of each payment covers interest. As the balance falls, more of each payment goes toward the principal. The repayment schedule in the calculator shows this shift year by year, which can be useful if you are modelling when your balance reaches a particular level.
For interest-only loans, the monthly payment is simply the principal multiplied by the monthly rate: P × r. There is no amortization because the balance stays constant throughout the term. The full loan amount comes back at the end, so planning for that repayment is a separate exercise.
Business Loan Repayment Examples
The table below shows monthly repayments and total interest costs at 8% for three common borrowing amounts across a range of terms. These are the figures most businesses reach for first when they want a rough sense of what a loan at their amount will cost. Use it as a reference point, then enter your actual figures in the calculator above for a personalised result.
| Loan amount | Interest rate | Term | Monthly repayment | Total interest | Total repayable |
|---|---|---|---|---|---|
| £10,000 | 8% | 1 year | £870 | £439 | £10,439 |
| £10,000 | 8% | 2 years | £452 | £855 | £10,855 |
| £10,000 | 8% | 3 years | £313 | £1,281 | £11,281 |
| £25,000 | 8% | 2 years | £1,131 | £2,136 | £27,136 |
| £25,000 | 8% | 3 years | £783 | £3,203 | £28,203 |
| £25,000 | 8% | 5 years | £507 | £5,415 | £30,415 |
| £100,000 | 8% | 3 years | £3,134 | £12,811 | £112,811 |
| £100,000 | 8% | 5 years | £2,028 | £21,658 | £121,658 |
| £100,000 | 8% | 6 years | £1,753 | £26,239 | £126,239 |
Doubling the term on a £25,000 loan from 2 years to 5 years at 8% cuts your monthly repayment from £1,131 to £507. That sounds like a significant saving until you look at the interest: it goes from £2,136 to £5,415. That trade-off is worth making only if your monthly cash flow genuinely needs it.
How Interest Rates Change the Cost of a Business Loan
A rate difference that looks small on a monthly basis adds up quickly across a multi-year term. The table below shows the same £25,000 loan over 3 years at four rates that cover the realistic range for most UK business borrowers.
| Loan amount | Term | Interest rate | Monthly repayment | Total repayable |
|---|---|---|---|---|
| £25,000 | 3 years | 8% | £783 | £28,203 |
| £25,000 | 3 years | 12% | £830 | £29,893 |
| £25,000 | 3 years | 18% | £904 | £32,537 |
| £25,000 | 3 years | 25% | £994 | £35,784 |
Moving from 8% to 25% on this loan costs your business an extra £7,581 over three years. The £211 monthly difference may feel manageable in isolation. But £7,581 is not a small number, and it is money your business pays without getting anything additional in return for it. If your lender comes back with a rate at the higher end of that range, use the calculator to test whether borrowing slightly less, or repaying over a shorter term, brings the total cost back to a level you can justify.
How Loan Term Changes Monthly Repayments
Extending your loan term reduces what you pay each month. It also increases what you pay in total, often by more than people expect. The table below shows a £25,000 loan at 10% across five terms so you can see both sides of that trade-off in one place.
| Loan amount | Interest rate | Term | Monthly repayment | Total interest |
|---|---|---|---|---|
| £25,000 | 10% | 1 year | £2,198 | £1,375 |
| £25,000 | 10% | 2 years | £1,154 | £2,687 |
| £25,000 | 10% | 3 years | £807 | £4,040 |
| £25,000 | 10% | 5 years | £531 | £6,871 |
| £25,000 | 10% | 7 years | £415 | £9,862 |
Going from a 1-year to a 7-year term reduces your monthly repayment by more than £1,700. It also costs your business an additional £8,487 in total interest. If the investment the loan funds generates revenue quickly, a shorter term is the cheaper decision. If protecting monthly cash flow is the priority, a longer term may be the right call. The honest answer is usually somewhere between those two positions, which is why testing a few different terms in the calculator is worth doing before you settle on one.
What Interest Rate Should You Use?
If you already have a quote, use that rate. If you are planning ahead before approaching a lender, the table below gives you a realistic range to test. The right rate to use is the one that reflects your actual business profile, not the lowest figure that makes the numbers look comfortable.
Business loan rates vary considerably based on your credit profile, trading history, loan size, and whether the borrowing is secured or unsecured. The ranges below reflect broad market patterns rather than any individual lender’s pricing. Treat them as a planning range, not a guarantee of what you will be offered.
| Business profile | Rate range to test |
|---|---|
| Strong trading history, good credit, established business | 6% to 12% |
| Average SME borrower, 2+ years trading | 12% to 20% |
| Short trading history or weaker credit profile | 20% to 35% |
| Unsecured borrowing, no specific asset security | Often higher than secured equivalent |
| Secured borrowing with property or significant asset | Often lower than unsecured equivalent |
Do not use the lowest rate in a range just to make the numbers look manageable. Test the middle and upper end of the band that fits your profile. If the repayment is still affordable at the higher end, you have a useful buffer if the actual offer comes back above your working assumption.
What Can Affect Your Business Loan Repayments?
Your monthly repayment and total cost follow directly from the figures you enter. What those figures turn out to be in practice depends on a wider set of factors that lenders weigh up during underwriting. These are the main ones worth understanding before you apply.
- Loan amount. Larger loans typically attract more rigorous underwriting, though some lenders offer better rates at higher amounts.
- Interest rate or APR. The rate your lender offers depends on your risk profile. A lower rate has a significant effect on total cost, particularly on longer terms.
- Loan term. Longer terms reduce monthly repayments but increase total interest. Some lenders restrict the maximum term based on loan size or business type.
- Arrangement fees. A 2% arrangement fee on a £100,000 loan adds £2,000 to your cost before you have made a single repayment.
- Secured or unsecured borrowing. Secured loans use an asset as collateral and typically attract lower rates. Unsecured loans carry more lender risk and are priced accordingly.
- Business turnover and profitability. Lenders use these to assess serviceability: whether your cash flow can sustain the repayments alongside your existing obligations.
- Trading history. Most mainstream lenders require 2 years of filed accounts. Some challenger lenders will consider 12 months of bank statements for shorter-term facilities.
- Credit profile. Both the business credit score and, often, the personal credit scores of the directors influence the rate and approval decision.
- Personal guarantee requirements. Many unsecured loans still require a personal guarantee. If the business defaults, a director’s personal assets, including property, can be at risk. This is a material consideration that does not show up in the calculator but belongs in any serious affordability assessment.
- Early repayment terms. If you intend to repay early, check whether the lender applies a penalty. An early repayment charge can cancel out much of the interest saving from settling ahead of schedule. Read this clause before signing.
APR vs Interest Rate in Business Loan Calculations
Most lender quotes include both an interest rate and an APR. They are not the same thing. Using the wrong one in your planning calculation can make a loan look cheaper than it actually is.
The interest rate is the annual cost of borrowing expressed as a percentage of the outstanding balance. It does not include fees, arrangement costs, or other mandatory charges. If a lender leads with the interest rate in its marketing, this is the figure to treat with more caution.
The APR (Annual Percentage Rate) includes the interest rate plus certain mandatory charges, expressed as a single annual figure. It gives you a more complete picture of what the borrowing costs and is the better figure for comparing offers side by side.
Why this matters in practice. A lender quoting 8% interest plus a 2% arrangement fee has an APR higher than 8%. If you enter only the interest rate in this calculator, your total cost figure will be understated. Where possible, use the APR from your lender quote. If you only have the headline rate, add the arrangement fee separately in the calculator’s fee field to get closer to the true total.
When the APR still is not enough. APR is standardised, but it does not always capture every cost. Late payment fees, draw-down fees, and monthly account charges may not be included. The APR is the right starting point for comparison, but the full loan agreement is where the complete cost picture lives. Read it before you sign.
Secured vs Unsecured Business Loan Repayments
The practical difference between a secured and an unsecured loan comes down to two things for your calculation: the rate you enter, and the risk you are accepting. Secured loans typically carry lower rates because the lender holds a charge over an asset. Unsecured loans carry higher rates because the lender takes on more risk. The table below summarises the main points that affect what you pay and what you are putting on the line.
| Factor | Secured business loan | Unsecured business loan |
|---|---|---|
| Security required | Asset usually required (property, equipment, or other significant asset) | No specific asset required, though a personal guarantee may be |
| Typical rate | Often lower, reflecting reduced lender risk | Often higher, reflecting the absence of asset security |
| Borrowing limit | Often higher, linked to asset value | Often lower, particularly for newer businesses |
| Risk to borrower | The secured asset may be repossessed on default | A personal guarantee may put personal assets at risk |
| Calculator impact | Enter a lower rate to model the cost of a secured loan | Enter a higher rate to model the cost of an unsecured loan |
The calculator works for both loan types. Enter the rate from your offer and the figures will reflect the right structure. If you are comparing a secured offer at 9% with an unsecured offer at 16%, run both and look at the total repayable figure across your chosen term. On a large loan over several years, the difference is rarely small.
Can Your Business Afford the Loan?
Knowing the cost is the straightforward part. Whether your business can actually carry the repayment, through a slow quarter or an unexpected cost, is the harder question. Work through this checklist before you commit. It is deliberately blunt, because a comfortable calculator result does not always mean a comfortable decision.
- Can your business cover this repayment in a weak sales month, not just in a typical one?
- Does the loan fund something that will directly improve revenue, margin, or efficiency within the term? If the answer is no, the cost of borrowing is harder to justify.
- Have you modelled the repayment alongside your VAT bill, payroll, tax liabilities, and supplier payments? Monthly cash flow rarely has just one demand on it.
- Would a shorter term that reduces the total cost put too much strain on your monthly cash flow to be viable?
- Would a longer term that eases monthly pressure make the total cost of borrowing higher than the benefit the loan funds?
- Is there a cheaper form of finance, such as asset finance, invoice discounting, or a revolving credit facility, that would meet the same need at a lower total cost?
If you cannot answer yes to the first two points, the monthly repayment being affordable does not make the loan the right decision. Affordability and purpose both have to work.
When to Use a Business Loan Calculator
Know your realistic monthly commitment before spending time on applications.
Enter each offer separately. The monthly difference often looks small; the total repayable difference rarely is.
Borrowing less at a better rate can cost less overall than borrowing more at a worse one.
Model the repayment alongside your other monthly obligations across the full term.
The full-term cost difference is usually larger than the monthly difference suggests.
The term comparison panel updates instantly as you adjust the inputs.
When a Business Loan Calculator May Not Be Enough
This calculator uses the standard amortization formula for fixed-rate capital and interest loans. It does that job well. For other borrowing products, the formula does not apply, and the result will be either wrong or misleading. Here is where it is not the right tool.
- Revenue-based or card sales financing. If repayments are linked to a percentage of monthly card turnover, the monthly payment varies rather than being fixed. A standard loan calculator cannot model this accurately.
- Asset finance or hire purchase. These products may have different structures, including balloon payments, residual values, or VAT payment schedules that a loan calculator does not capture.
- Invoice finance. Costs are typically based on a percentage of each invoice drawn down and a monthly service charge, not a fixed repayment schedule.
- Variable-rate loans. If the rate can change during the term, the calculator result is only accurate for the period the rate remains fixed.
- Loans with early repayment charges. The calculator shows total interest assuming you repay over the full term. If you intend to repay early, the actual total cost may be higher once penalties are factored in.
- Factor rate financing (such as merchant cash advances). Factor rates are not annual percentage rates and cannot be entered directly. Converting a factor rate to an equivalent APR requires a separate calculation.
- Interest-only or balloon repayment loans. The calculator’s interest-only mode shows the monthly interest payment, but does not model complex balloon or bullet repayment structures where a large sum is due at specific intervals.
If any of these apply, the related calculators below cover the most common alternatives. For complex or bespoke structures, a finance broker who works with that product type will give you a more accurate picture than any generalised calculator can.
Other Business Finance Calculators
If the standard loan calculator does not fit your borrowing product, these tools cover the most common alternatives.
Business Loan Calculator Limitations
The calculator produces estimates, not quotes. Before you make any borrowing decision based on these figures, the following limitations are worth understanding.
- Results are estimates only. Actual lender repayments may differ due to rounding, fee structures, or the lender’s own calculation methodology.
- Lender rates may differ from your input. The rate you are offered will depend on your application, credit assessment, and the lender’s pricing at the time of application. Test a range rather than relying on a single scenario.
- Not all fees are included. The calculator captures an arrangement fee, but other charges such as legal fees, valuation fees, broker fees, or monthly service charges may apply and are not reflected in the result.
- Approval is not guaranteed. Entering figures that produce an affordable monthly repayment does not mean a lender will approve your application on those terms.
- Variable rates can change. If your loan has a variable interest rate, the calculator result only applies for the period the rate remains unchanged.
- The calculator does not assess eligibility. It does not assess your credit profile, trading history, or lender-specific criteria. It is a cost modelling tool, not an affordability assessment.
- This is not financial advice. The result is not a loan offer, a credit decision, or a recommendation. If you are uncertain about which type of finance is right for your business, consider speaking to a qualified finance broker or adviser.
Frequently Asked Questions
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How do I calculate business loan repayments?
Use the calculator at the top of this page. Enter the loan amount, annual interest rate, and repayment term. The calculator applies the standard amortization formula and returns an estimated monthly repayment, total interest, and total amount repayable in seconds. If you want to check the maths manually, the formula is: monthly repayment = P × r × (1 + r)n ÷ ((1 + r)n − 1), where P is the principal, r is the monthly interest rate (annual rate divided by 12), and n is the total number of monthly payments.
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What is a good interest rate to use in a business loan calculator?
Use your lender quote if you have one. If you are planning ahead, test a range that fits your business profile rather than picking a single figure. Established businesses with good credit history typically see rates between 6% and 12%. Newer businesses or those with limited credit history are often quoted between 15% and 35%. Testing both the middle and upper end of the range that matches your profile gives you a much more realistic picture of what the loan will actually cost.
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Should I use APR or interest rate in the calculator?
Use the APR where possible. APR includes certain mandatory charges alongside the interest rate and gives a more complete picture of what the borrowing actually costs. If you only have the headline interest rate and know there are fees on top, enter the rate and add the arrangement fee separately in the fee field to get closer to the true total.
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Why does a longer loan term cost more overall?
A longer term means more monthly payments, and each payment includes an interest charge on the outstanding balance. Even though the monthly repayment is lower, you are paying interest for more months in total. The term comparison table on this page shows exactly how much more total interest you pay as you extend the term on the same loan at the same rate.
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Does using a business loan calculator affect my credit score?
No. Using this calculator does not involve a credit check and has no effect on your credit score. Only a formal loan application, which typically involves a hard credit search, will appear on your credit file.
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Can I use this calculator for unsecured business loans?
Yes. The calculator works for both secured and unsecured business loans. The key difference is the interest rate you enter. Unsecured loans typically carry higher rates than secured equivalents because the lender has no asset to fall back on if the business defaults. Enter the rate quoted in your offer to get an accurate estimate for either type.
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Can I use this calculator for secured business loans?
Yes. Enter the rate and term from your secured loan offer. Secured loans often carry lower rates because the lender holds a charge over an asset, which reduces their risk. Use the interest-only option if your secured loan has an interest-only structure with the principal repaid at the end of the term.
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What fees should I include in a business loan calculation?
The calculator includes an arrangement fee field, which covers setup or origination fees typically expressed as a percentage of the loan. Other fees you may encounter include legal fees, valuation fees (for secured loans), broker fees, and monthly account charges. These are not captured in the calculator, so add any known additional costs manually to your total repayable figure when comparing offers.
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Why might my lender quote be different from the calculator result?
Lenders may use different calculation conventions, apply fees differently, or round figures in their own systems. Some lenders calculate interest on a daily basis rather than monthly, which produces a slightly different result over time. The calculator provides an estimate based on the standard monthly amortization formula. Use it for comparison purposes and treat the lender’s own schedule as the definitive figure once you have received a formal offer.
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Can I calculate early repayment savings?
The calculator does not model early repayment directly. To estimate the saving, run the same loan at the shorter term you would actually repay over. For example, if you have a 5-year loan but plan to repay in year 3, enter 3 years as the term and compare the total interest. If your loan carries an early repayment charge, add that cost to your comparison before drawing any conclusion about the saving — the penalty can absorb a significant portion of the interest saved.