Free tools for e-commerce operators
A suite of free calculators to drive your profitability, acquisition and retention. No signup, no data sent.
The essential KPIs for a profitable e-commerce
Revenue alone is not enough to run an e-commerce business. ROAS, LTV, CAC, net margin and break-even point are the metrics that determine whether your business is truly profitable.
These free calculators allow you to run a quick initial diagnostic. For automated, real-time tracking, connect your store to Fullmetrix.
ROAS Calculator
Calculate your ROAS, break-even ROAS and POAS in seconds.
LTV Calculator
Calculate your e-commerce customer lifetime value and maximum profitable CAC.
CAC Calculator
Calculate your customer acquisition cost, LTV:CAC ratio and payback period.
Margin Calculator
Calculate your gross margin, net margin after all costs and markup.
Break-Even CPA Calculator
Calculate your maximum profitable CPA, max CPC and estimated orders.
AOV Calculator
Calculate your average order value, simulate the impact of an increase and identify optimization levers.
LTV:CAC Ratio Calculator
Evaluate customer acquisition profitability with the LTV:CAC ratio and payback period.
Churn Rate Calculator
Calculate your churn rate, retention rate and the impact on your recurring revenue.
Retention Rate Calculator
Measure your customer retention rate and compare yourself to industry benchmarks.
Marketing Budget Calculator
Determine the optimal marketing budget to hit your revenue target.
COGS Calculator
Calculate your cost of goods sold, gross margin and the COGS/revenue ratio.
Sales Forecast Calculator
Project your monthly revenue over several months using a compound growth rate.
WhatsApp Business API Pricing Calculator
Estimate the cost of WhatsApp messages by country, category and monthly volume. Official Meta rates.
Who are these tools for?
Beginner e-commerce merchants
Understand your key metrics before investing in advertising. Calculate your real margin and your maximum profitable CAC.
Acquisition managers
Evaluate the profitability of your ad campaigns. Calculate your break-even ROAS and CPA before scaling.
E-commerce directors
Make strategic decisions based on customer LTV, LTV:CAC ratio and contribution margin.
Where to start based on your role
I am new to e-commerce
Start with the margin calculator and the AOV calculator. You need to know your real net margin before any ad spend, otherwise you scale losses.
I manage paid acquisition
ROAS, CAC, break-even CPA and marketing budget. These 4 calculators form the basic toolkit to manage Meta Ads, Google Ads and TikTok Ads without burning budget.
I am a CFO or finance lead
LTV, LTV:CAC ratio, COGS and sales forecasting. These calculators give you the financial projections useful for board meetings, fundraising or 12-month budget plans.
I am a CEO or founder
Break-even CPA, LTV:CAC ratio and retention rate. The 3 metrics that decide whether your business model is viable at scale. Review before every major strategic decision.
Everything about our free calculators
Is my data sent to your servers?+
No. All calculations run locally in your browser in client-side JavaScript. No data is transmitted, stored or logged on Fullmetrix's side. Close the page and everything disappears.
Are the calculations accurate?+
The formulas used are the industry-standard ones (ROAS = ad revenue / ad spend, LTV = AOV x frequency x lifetime, etc.). Accuracy depends on the quality of the numbers you enter: an approximate AOV yields an approximate LTV.
Can I export my results?+
Yes, each calculator lets you copy the results or save them as a PDF. No email or signup required for the basic export. A premium PDF with industry benchmarks is optional and free in exchange for an email.
What is the difference between a free calculator and Fullmetrix?+
The calculators are one-shot diagnostic tools: you enter the numbers by hand. Fullmetrix connects directly to your PrestaShop, WooCommerce or Shopify and recomputes every metric continuously, no re-entry, with cohorts, attribution and history.
Do the calculators work on mobile?+
Yes, all calculators are mobile-optimized. The UI adapts automatically, numeric keyboards trigger on number fields and results remain readable on iPhone and Android.
Are they truly free and ad-free?+
Yes. No ads, no third-party tracking, no usage limit. The only CTA is a link to the Fullmetrix free trial at the bottom of the page, which you can ignore. Our interest is that you use the tools and come back.
Related pages
Free tools
ROAS, break-even ROAS and POAS.
Customer lifetime value and max profitable CAC.
Acquisition cost and LTV:CAC ratio.
Gross margin, net margin and markup.
Max CPA, max CPC and optimal budget.
Average order value, target gap and revenue impact.
Automate your KPI tracking
Connect your store in 2 minutes and access all your metrics in real time: profit, cohorts, RFM, LTV and audience sync.
14-day free trial. No commitment.