I built CalcFuel — a collection of 35+ free marketing and business calculators — because every time I needed to quickly calculate ROI, markup, or break-even for a client, I was opening spreadsheets or Googling formulas.
Here are the calculators small business owners actually use, and when to use them.
Money & Pricing
GST Calculator
Add or remove 10% GST instantly. If you're in Australia, you use this daily.
Markup Calculator
Know your cost, pick your markup %, see your selling price. Most businesses guess their markup — this removes the guesswork.
Break-Even Calculator
How many units do you need to sell before you stop losing money? This is the first calculation every product-based business should run.
Profit Margin Calculator
Enter revenue and costs, see your margin. If your margin is under 20%, you have a pricing problem, not a marketing problem.
Marketing Performance
ROI Calculator
Put in what you spent, what you earned. If the ROI is negative, stop spending. Simple — but most small businesses never calculate this for individual campaigns.
CPM Calculator
Compare ad costs across platforms. Facebook CPM vs Google CPM vs LinkedIn CPM — this tells you where your impressions are cheapest.
CPC Calculator
Cost per click across your campaigns. If you're paying $5+ per click and your product is $20, the math doesn't work.
Customer Acquisition Cost
Total marketing spend divided by new customers. Track this monthly. If it's going up, your marketing is getting less efficient.
Content & Social
Engagement Rate Calculator
Likes + comments + shares divided by followers. If your engagement rate is under 1%, your content isn't resonating — change the format before you change the platform.
A/B Test Calculator
Did version A actually beat version B, or was it random noise? This calculator tells you if your test result is statistically significant.
Why these matter
Most small businesses make marketing decisions on gut feel. "Facebook feels like it's working" isn't a strategy. "Facebook is producing leads at $15/lead with a 3x ROI" is.
These calculators take 30 seconds each. Use them before you spend, not after.
The full list
All 35+ calculators are free, no signup required, at calcfuel.com. Categories include:
- Financial (GST, markup, margin, break-even, compound interest)
- Marketing (ROI, CPM, CPC, CAC, LTV, engagement rate)
- Conversion (A/B test, conversion rate, ROAS)
- Productivity (time tracking, hourly rate)
Bookmark it. Use it next time someone asks "is this campaign actually working?"
Going deeper
If you want to go beyond calculators and actually fix your marketing, I've put together 50 AI Marketing Prompts for Australian SMBs — copy-paste prompts for social media, email, SEO, content, and competitor analysis. $19 AUD.
Built by MarketingAI — AI-powered marketing for small businesses.
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