✧ FREE ONLINE CALCULATOR TOOLS

Free Ecommerce & Business Calculators 2026

Amazon, eBay, Etsy, Shopify, TikTok Shop, Stripe, PayPal — plus AI cost tools — all in one place. Calculate fees, ROI, profit margins, ad performance, subscription metrics & AI API costs. Free, instant, no email wall, no signup.

All calculations happen in your browser — no data stored, no account required.

📦Amazon 🛒eBay 🛍️Shopify 🎨Etsy 💳Stripe & PayPal
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71 Free Tools · Updated May 2026 · Built for ecommerce sellers, marketers & SaaS founders worldwide

📦 Amazon Sellers
🛍️ Shopify Stores
📈 Marketing Teams
💻 SaaS Founders

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Browse all free business calculators. Click any card to start calculating.

Free Business Calculators for Ecommerce & SaaS Professionals

Our comprehensive suite of calculators covers every aspect of online business:

  • • Ecommerce: Amazon FBA, Shopify, eBay, Etsy, TikTok Shop & shipping cost calculators
  • • Marketing: ROI, ROAS, CAC, conversion rate calculators
  • • Finance: Gross margin, profit margin, markup & break-even calculators
  • • SaaS: MRR, LTV, churn rate, OpenAI API cost calculators
  • • Payment: Stripe, PayPal, VAT, currency converters & tip calculators

Frequently Asked Questions

How much are Amazon FBA fees in 2026? Which has lower fees — Stripe or PayPal? What is a good ROAS? These are the most common questions from ecommerce sellers, marketers, and SaaS founders using our free calculators.

Are these calculators really free?

Yes! All calculators on Ecom Calc Tools are completely free to use. No registration, no subscription, no hidden fees. Just open any calculator and start calculating.

How often are the calculators updated?

We regularly update our calculators to reflect the latest fee structures, tax rates, and industry standards. Last update: May 2026 with current Stripe, PayPal, Amazon, and TikTok Shop rates.

Can I use these tools for my SaaS business?

Absolutely. Our SaaS calculators include MRR projections, Customer Lifetime Value (LTV), Churn Rate, and Burn Rate calculators - essential metrics for subscription businesses.

Do you support multiple currencies?

Yes! Most calculators support USD, EUR, GBP, and other major currencies. Check each calculator's settings for available currency options.

Which calculators do marketing professionals need?

Marketers should start with ROAS, CAC, CPM, and ROI calculators to optimize ad spend. Our Conversion Rate and Email Marketing ROI tools help improve campaign performance.

How accurate are these calculations?

Our calculators use official fee schedules and industry-standard formulas. However, results should be used as estimates - always verify with official sources for critical business decisions.

Etsy vs eBay — which platform is better for handmade sellers?

Etsy is designed for handmade, vintage, and craft supplies — it has a built-in audience of buyers looking for unique items. Etsy's fees are 6.5% transaction + 3–4% payment processing + $0.20 listing fee. eBay final value fee is 13.25% for most categories (10.9–14.9% by category), capped at $750, with payment processing included. For handmade sellers, Etsy often provides better visibility, but eBay may offer more volume. Compare both with our Etsy vs eBay Fee Calculator.

Amazon FBA vs Shopify — which platform is more profitable?

Profitability depends on your product type, volume, and fulfillment preferences. Amazon FBA saves you handling logistics but charges fulfillment fees; Shopify gives you more margin control but requires self-fulfillment. Use both our Amazon FBA Profit Calculator and Shopify Profit Margin Calculator to compare your specific numbers side-by-side.

Stripe vs PayPal — which has lower cross-border fees?

PayPal typically charges 3–4.5% for international transactions plus a fixed currency conversion fee. Stripe charges 2.9% + 30¢ for US cards but adds 1% for cross-border payments. For high-volume international sellers, Stripe is often more competitive. Compare your actual volume with our Stripe vs PayPal Fee Comparator.

TikTok Shop vs eBay — which platform has higher fees?

TikTok Shop charges 2–8% in seller fees depending on category, plus a 3.5% + $0.30 payment processing fee. eBay final value fee is 13.25% for most categories (10.9–14.9% by category), capped at $750, with payment processing included under Managed Payments. For most categories, TikTok Shop is notably cheaper in fees — but eBay has a larger established buyer base. Calculate your specific scenario with our TikTok Shop Fee Calculator and eBay Fee Calculator.

What is a good ROAS for Facebook Ads in 2026?

A good ROAS for Facebook Ads varies by industry and profit margins. Generally, a 4:1 ROAS is considered healthy (earning $4 for every $1 spent on ads), while a 10:1 ROAS is excellent. However, ecommerce businesses with thin margins may need 5-7:1 to be profitable after all costs. Use our ROAS Calculator to find your break-even ROAS and optimize accordingly.

How much does Amazon FBA cost per month?

Amazon FBA has multiple costs: a monthly storage fee ($0.78-$2.40 per cubic foot depending on season), referral fees (6-17% of sale price), and fulfillment fees ($3.22-$6.50+ per unit). There is no monthly subscription for Individual sellers; Professional sellers pay $39.99/month. Use our Amazon FBA Profit Calculator to get a complete picture of your monthly FBA costs.

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