Free, accurate calculators for ecommerce sellers and AI developers — updated for 2026
EcomCalcTools provides free, accurate calculators for anyone selling online or building with AI. Our tools cover:
Ecommerce fees — Amazon FBA, eBay, Etsy, Shopify, TikTok Shop, Stripe, PayPal, and more. Calculate referral fees, fulfillment costs, transaction charges, and net proceeds in seconds.
AI & LLM costs — Token pricing, API billing, RAG pipelines, and agent ROI. Compare GPT-4o, Claude, Gemini, and DeepSeek costs before you build.
Business metrics — Profit margins, ROAS, CAC, LTV, churn, and unit economics. Model scenarios, set targets, and make data-driven decisions.
Most free calculators online are either outdated, oversimplified, or designed to sell you something. We built EcomCalcTools to be different — a resource you can actually trust when making business decisions that affect your bottom line.
We check official pricing pages monthly. Any major provider change triggers an update within 48 hours.
Every calculator shows its formula, data source, and last-updated date. We never hide what goes into the calculation.
We test every calculator against real-world scenarios, not synthetic edge cases. Results reflect what you'll actually see.
All calculators are 100% free. No signup, no credit card, no feature limits. Use them as often as you need.
AI and ecommerce pricing changes frequently. We monitor official pricing pages from all major providers and review our calculators monthly. When providers announce changes, we update affected tools within 48 hours. Each calculator includes a "Last Updated" date so you know the data is fresh. See our methodology and pricing update policy for full details.
Found a pricing error or have a feature request? Email us at hello@ecomcalctools.com.
We respond within 48 hours and update affected calculators immediately upon verification.
Browse our 71+ free calculators for ecommerce fees, AI costs, and business metrics.