Work out how much each sale contributes toward fixed costs and profit. Enter your selling price and variable cost to calculate contribution per sale, contribution margin percentage and total contribution. Optionally add sales volume and fixed costs to see how contribution affects your overall profit.
Transparent formulae • Australian business calculator. All amounts in Australian Dollars, excluding GST.
Values auto-recalculate instantly. All amounts in Australian Dollars.
The amount charged for one product, job, booking or service.
Costs that increase directly with each additional sale, such as materials, product cost, commissions or job-specific costs.
Enter the number of products, jobs, bookings or services sold to calculate total contribution.
Costs that generally remain regardless of sales volume, such as rent, software, insurance and base overheads.
Enter a desired profit to calculate the number of sales required to reach it.
Each sale contributes $60.00 toward fixed costs and profit based on the figures entered.
At a selling price of $150.00 and a variable cost of $90.00, each sale produces $60.00 of contribution. This equals a 40.0% contribution margin. At 100 sales, total contribution is approximately $6,000.00. After the $4,000.00 of fixed costs entered, approximately $2,000.00 remains. To generate the $5,000.00 target profit entered, approximately 150 sales would be required based on the current contribution per sale and fixed costs.
Contribution sits between gross revenue and final business profit. This three-stage waterfall demonstrates how revenue is absorbed by immediate costs before releasing surplus to the business.
Customer pays total gross selling price (excluding GST).
Covers inventory, merchant fees, direct job materials, and contractor labor.
Contribution surplus proceeds to clear rent, software, and create owner profit.
Contribution margin measures the proportion of sales revenue remaining after direct variable costs have been settled. It represents the money each unit brings in that directly "contributes" to paying off company-wide overheads (like commercial rent, insurance, and executive salaries). Once those fixed overheads reach zero, every subsequent dollar of contribution becomes pre-tax net profit.
No. Gross Margin evaluates Sales Revenue minus Cost of Goods Sold (COGS). However, COGS frequently bundles fixed factory overheads (like workshop depreciation). In contrast, Contribution Margin strictly deducts only true variable expenses (shipping, materials, payment gateway surcharges) while segregating all fixed commitments.
Open Gross Margin CalculatorA high contribution margin does not guarantee a profitable business if fixed operational overheads are too high to be absorbed by unit volume:
Expressing contribution as a percentage standardises comparisons across different price tiers. For instance:
While Product B brings higher raw cash per transaction, Product A generates 5 cents more overhead coverage per dollar of revenue.
Analyse how slight shifts in pricing, variable input costs, and sales scale dynamically influence your business contribution.
Holding variable costs static at $90.00.
| Shift | Selling Price | Contrib/Unit | Margin % |
|---|---|---|---|
| -20% | $120.00 | $30.00 | 25.0% |
| -10% | $135.00 | $45.00 | 33.3% |
| Current | $150.00 | $60.00 | 40.0% |
| +10% | $165.00 | $75.00 | 45.5% |
| +20% | $180.00 | $90.00 | 50.0% |
Holding selling price static at $150.00.
| Shift | Var Cost | Contrib/Unit | Margin % |
|---|---|---|---|
| -20% | $72.00 | $78.00 | 52.0% |
| -10% | $81.00 | $69.00 | 46.0% |
| Current | $90.00 | $60.00 | 40.0% |
| +10% | $99.00 | $51.00 | 34.0% |
| +20% | $108.00 | $42.00 | 28.0% |
Based on $4,000.00 fixed overheads.
| Units | Revenue | Total Contrib | Net Profit |
|---|---|---|---|
| 50 | $7,500.00 | $3,000.00 | $-1,000.00 |
| 100 | $15,000.00 | $6,000.00 | $2,000.00 |
| 250 | $37,500.00 | $15,000.00 | $11,000.00 |
| 500 | $75,000.00 | $30,000.00 | $26,000.00 |
Break-even represents the exact number of transactions needed to eliminate operational loss. Every sale past this mark delivers profit directly at the unit contribution amount.
To achieve an explicit financial dividend after covering fixed overheads, expand the break-even model to incorporate desired target profit:
A plumbing contractor in Brisbane charges an average commercial service fee of $250.00 (ex-GST). Job-specific parts, call-out diesel, and technician commission total $100.00 per job.
The firm completes 50 booked commercial jobs across a calendar month, generating $12,500 in revenue and consuming $5,000 in variable materials.
The contractor incurs $5,000 in monthly fixed recurring expenses (van finance, base liability insurance, software).
Correct categorisation prevents distorted contribution metrics under Australian accounting conventions.
Costs that fluctuate proportionally to sales volume:
Overheads that remain static whether you make 0 or 1,000 sales:
In Australia, contribution calculations should strictly exclude GST. GST collected (10%) is an ATO liability, not business revenue. Similarly, GST paid on inputs is claimed back via Input Tax Credits on your BAS.
If Variable Cost equals Selling Price, contribution is $0. If Variable Cost exceeds Price, each sale increases operational deficit.
Detailed answers on contribution analysis for Australian business owners, sole traders, and corporate managers.
Gross profit margin deducts Cost of Goods Sold (COGS), which under Australian accounting principles often includes fixed manufacturing overheads such as equipment lease amortisation or workshop supervisor base pay. Contribution margin, however, isolates pure variable expenses directly tied to volume, providing an exact picture of how cash flow responds to incremental unit sales.
Always calculate contribution on a GST-exclusive basis if your enterprise is GST-registered (gross annual turnover of $75,000 AUD or more). The 10% collected is held in trust for the ATO, and GST paid on purchases is refundable via your Business Activity Statement (BAS) as Input Tax Credits.
Yes. A negative contribution margin occurs when variable costs exceed the unit selling price. Under these conditions, every sale actively drains company liquidity before accounting for rent or salaries. Immediate repricing or cost renegotiation is required.
There is no universal statutory benchmark. High-overhead industries (such as digital SaaS or specialised consulting) often operate with 70% to 90% contribution margins to offset software and product engineering. Conversely, high-volume retail or grocery distribution operates sustainably with margins between 15% and 25%.
Contribution margin is the direct mathematical divisor in break-even analysis: Total Fixed Costs divided by Contribution Per Unit equals the exact unit volume needed to cover business overheads without incurring debt.
Percentage-based EFTPOS, Stripe, or payment terminal fees (e.g. 1.75% per swipe) are strictly variable costs because they scale directly with transaction volume. However, terminal monthly rental charges (e.g. $29/month per hardware device) are fixed costs.
Salaried employees and standard office overheads are fixed. Conversely, casual contractors or hourly staff paid strictly to produce specific units or service specific client calls (plus their statutory Superannuation Guarantee) should be allocated as variable labor.
Because variable unit costs remain unchanged, a price reduction directly erodes contribution dollar-for-dollar. For instance, a 10% discount on a product with a 40% margin causes a 25% drop in contribution per sale, requiring a much higher volume of sales to achieve the same total profit.
Multi-product enterprises calculate a Weighted Average Contribution Margin (WACM). Multiply each product line's contribution margin by its percentage share of total revenue, then sum the results.
Yes. Simply treat each billable hour, project milestone, or fixed-fee engagement as one "unit." Deduct direct subcontractor costs, travel disbursements, or third-party software seat licences tied to that client as the variable cost.
This creates operating leverage. Once fixed overheads are covered at break-even, 100% of the contribution margin from each extra unit drops directly into net pre-tax profit.
Interconnected financial utilities using the same transparent approach.
Connect unit contribution directly into a break-even trajectory or verify retail markups.
General information only. The calculations, illustrations, and formulas presented on this website are provided for illustrative and educational purposes under Australian general taxation principles. They do not constitute formal legal, accounting, tax, or financial advice. Because individual commercial structures, GST registration states, and enterprise award frameworks vary, consult a registered Australian Tax Agent or CPA before executing commercial pricing decisions.