Free Online Calculators
60+ free calculators for marketing, finance, fuel, social media, and more. No sign-up required.
Financial Calculators
ROI, ROAS, mortgage repayments, GST, stamp duty, negative gearing, capital gains tax, superannuation — free Australian financial calculators.
- › Tax Refund Estimator
- › Income Tax
- › Salary Sacrifice
- › Work From Home Tax
- › HECS-HELP Repayment
- › Franking Credits
- › Capital Gains Tax
Email Marketing Calculators
Calculate open rates, click-through rates, list growth, and campaign ROI to optimise your email marketing performance.
- › Email Open Rate
- › Click-Through Rate
- › Email List Growth
- › Cost Per Lead
Social Media Calculators
Measure engagement rates, follower growth, and social ROI across Instagram, LinkedIn, TikTok, and more.
- › Engagement Rate
- › Follower Growth Rate
- › Social Media ROI
Conversion & Revenue Calculators
Track customer acquisition costs, lifetime value, conversion rates, and marketing budget performance.
- › Customer Acquisition Cost
- › Customer Lifetime Value
- › Conversion Rate
- › Revenue Per Lead
Fuel & Energy Calculators
Fuel cost estimators for road trips, commutes, fleets, and off-grid power — plus EV vs petrol comparisons.
- › Trip Fuel Cost
- › Commute Fuel Cost
- › EV vs Petrol
- › Generator Fuel
SEO & Web Tools
Website speed impact, traffic projections, NPS calculator, and other tools to grow organic reach.
- › Website Speed Impact
- › Website Traffic
- › Net Promoter Score
About CalcFuel Calculators
CalcFuel is a free collection of online calculators built for small business owners, marketers, investors, and anyone who needs quick, accurate numbers without a spreadsheet. All calculators are free, run in your browser, and require no sign-up.
Our most popular tools include the Income Tax Calculator, Work From Home Tax Calculator, HECS-HELP Repayment Calculator, and Capital Gains Tax Calculator.
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