Free Calculator - Updated October 2026
Business loan repayment calculator: see your weekly, fortnightly or monthly repayments in seconds.
Enter the loan amount, term, interest rate and repayment frequency. Instantly see your repayment, total interest and total repaid for a business loan of $10,000 to $500,000 over 3 to 36 months in Australia.
How the business loan calculator works
The calculator uses the reducing-balance method that applies to interest-rate business loans in Australia. Each repayment first covers the interest accrued on the outstanding balance for that period, and the remainder reduces the principal. Because the balance falls with every repayment, the interest portion shrinks and the principal portion grows over the term. Rates start from 14.55% p.a. and are indicative only: actual pricing depends on your credit assessment, business profile, revenue, trading history and lender criteria.
Periodic rate = annual rate / repayments per year (52, 26 or 12)
Repayments = term in months x repayments per year / 12
Repayment = amount x periodic rate / (1 - (1 + periodic rate) ^ -repayments)
Total repaid = repayment x number of repayments
Total interest = total repaid - amount
Worked example: $50,000 over 12 months at 18% p.a., weekly
The periodic rate is 18% / 52, or about 0.346% a week, across 52 weekly repayments. That gives a repayment of about $1,052 a week. The first repayment carries $173 of interest and $879 of principal; by the final week almost all of the repayment is principal. Total interest is roughly $4,721 and total repaid $54,721. At the 14.55% panel floor the weekly repayment drops to about $1,035.
Business loan repayments at a glance
$20,000 over 6 months
$806/wk
18% p.a., 26 weekly repayments, about $948 total interest
$50,000 over 12 months
$1,052/wk
18% p.a., 52 weekly repayments, about $4,721 total interest
$100,000 over 24 months
$1,147/wk
18% p.a., 104 weekly repayments, about $19,249 total interest
All figures indicative, reducing balance, excluding fees. Longer terms lower the repayment but raise total interest because the balance is outstanding for longer.
Business loan vs business overdraft: which costs less?
It depends on how the money is used. A loan charges interest on the full balance from day one, so it suits a one-off, known cost such as equipment, a fitout or a season's stock. An overdraft charges interest only on the drawn balance plus a line fee on the limit, so it suits recurring gaps such as wages before invoices land. Model the overdraft side in the business overdraft calculator, then compare the two totals for your situation.
| | Business loan | Business overdraft |
|---|
| Interest charged on | Full balance, reducing as you repay | Drawn balance only, plus a line fee on the limit |
| Repayments | Fixed, weekly to monthly, over 3 to 36 months | Flexible: draw, repay, redraw |
| Best for | One-off known cost | Recurring, unpredictable gaps |
| Indicative panel rate | 14.55% to 25% p.a. | 14.55% to 25% p.a. plus 0.5% to 2% p.a. line fee |
| Security under $150K | None, personal guarantee only | None, personal guarantee only |
Read more: unsecured business loans, small business loans and business overdraft vs business loan.
Frequently asked questions
How are business loan repayments calculated?
This calculator uses the standard reducing-balance (amortising) formula: each repayment covers the interest accrued on the outstanding balance for that period, and the rest reduces the principal, so the interest portion falls every period. Repayment = loan amount x periodic rate / (1 - (1 + periodic rate) ^ -number of repayments), where the periodic rate is the annual rate divided by 52, 26 or 12. Some non-bank lenders quote a fixed fee or factor rate instead; those loans do not reduce in cost if you repay early.
What interest rate should I use in the business loan calculator?
Through the OverdraftMe panel, unsecured business loans run from 14.55% to 25% p.a., so the slider covers that range and defaults to 18%. Use the lower end if you have 2 or more years of trading, consistent monthly deposits above $20,000 and a clean credit file, and the upper end for a 6 to 12 month trading history or an Equifax score near 550. Bank loans secured by property sit around 6% to 12% p.a. but need full financials and usually property.
How much does a $50,000 business loan cost per week?
A $50,000 business loan repaid weekly over 12 months costs about $1,052 a week at 18% p.a. ($1,035 at the 14.55% panel floor), which is roughly $4,721 in total interest. Over 24 months the weekly repayment falls but total interest rises, because the balance is outstanding for longer.
What is the difference between an interest rate and a factor rate?
An interest rate is charged on the reducing balance, so your total cost falls as you repay. A factor rate is a fixed multiplier on the amount borrowed: borrow $50,000 at a 1.25 factor and you repay $62,500 regardless of timing. Over 6 months a 1.25 factor is roughly 90% APR equivalent. If a lender quotes a factor rate, convert it with the factor rate to APR calculator before comparing it with the result here.
Weekly, fortnightly or monthly repayments: which is cheaper?
The difference is small on a reducing-balance loan. On $50,000 over 12 months at 18% p.a., weekly repayments cost about $4,721 in interest, fortnightly about $4,807 and monthly about $5,008, because more frequent repayments reduce the balance slightly sooner. Most non-bank lenders in Australia debit weekly, which also matches how cash flows through a trading business. Pick the frequency that suits your deposits, not the one that saves a few dollars.
Can I repay a business loan early?
On most interest-rate loans, yes, and you save the remaining interest because it has not yet accrued. On fixed-fee or factor-rate loans the total repayable is set at the start, so early repayment saves nothing unless the lender offers an early-payout discount. Ask before you sign; we flag this on every quote.
How accurate is this business loan calculator?
It is an indicative estimate using the reducing-balance method and the rate you set. Actual repayments depend on the lender's pricing, any establishment fee, the exact repayment schedule and your credit assessment. Use it to plan, then get a real quote from the panel of 50+ lenders through the 2-minute eligibility check. No credit check, no obligation.
