How the Profit Margin Calculator Works (With a Worked Example)
Calculates gross profit, margin and markup from cost and price. This guide walks through what each input means, the formula behind the answer and a worked example using typical Australian figures. You can follow along in the free Profit Margin Calculator.
Why it matters
Australian businesses deal with GST at 10%, BAS reporting, PAYG withholding for staff, super guarantee obligations and company or individual tax depending on structure. Getting pricing and margins right is the difference between busy and profitable.
What you need to enter
The calculator asks for 2 inputs. The table shows each one with the example value used later in this guide.
| Input | Example value |
|---|---|
| Cost ($) | 60 |
| Selling price ($) | 100 |
The formula
Margin = (price − cost) ÷ price. Markup = (price − cost) ÷ cost.
Worked example
Entering the example values above gives these results:
| Result | Value |
|---|---|
| Profit margin | 40% |
| Gross profit | $40.00 |
| Markup | 66.67% |
The headline figure is 40% (profit margin). Change any input in the calculator and every result updates instantly, so you can test different scenarios side by side.
How the profit margin changes with cost
The table below keeps every other input at the example value and moves only “Cost ($)” up and down by 10% and 20%. It shows how sensitive the profit margin is to that one figure.
| Cost ($) | Profit margin |
|---|---|
| 48 | 52% |
| 54 | 46% |
| 60 | 40% |
| 66 | 34% |
| 72 | 28% |
At 48 the result is 52%; at 72 it is 28%. If a small change in this input moves the answer a lot, it is worth double-checking that figure before you rely on the result.
A practical tip
Work margins out on GST-exclusive prices. GST is collected for the ATO, not earned.
Keep going
Before relying on the number, read Getting the Most From a Profit Margin Calculator: Tips and Common Errors. You might also find these guides useful:
- Markup Calculator: Formula, Example and What the Result Means
- Using a Break-Even Calculator in Australia: A Step-by-Step Guide
- Contractor Hourly Rate Calculator Explained for Australians
Frequently asked questions
- When do I need to register for GST?
- When your annual GST turnover reaches $75,000, or $150,000 for non-profits. Taxi and ride-share drivers must register regardless of turnover.
- What company tax rate applies?
- 25% for base rate entities with turnover under $50 million, and 30% for other companies.
- Should I talk to an accountant?
- Yes, for structure, tax planning and compliance. These calculators give quick estimates only.
Run your own numbers in the Profit Margin Calculator.
Open the calculatorGeneral information only. Rates and thresholds change, usually on 1 July. Confirm current figures with the ATO or the relevant authority, and get personal advice for decisions about your situation.