Free fee and profit calculators for online businesses.
PenguinCalc collects practical calculators for PayPal fees, Stripe fees, eBay seller fees, Shopify profit, YouTube creator metrics, and payment platform comparisons. Fast answers, clear assumptions, no spreadsheet wrestling.
Calculator directory
Use the live tools below. Each calculator is published only after the formula, assumptions, and source notes are ready.
PayPal Fee Calculator
Estimate PayPal fees, net payout, and how much to invoice so you receive a target amount.
LiveStripe Fee Calculator
Calculate Stripe card, ACH, international, currency conversion, and reverse fees for US payments.
LivePayPal vs Stripe
Compare payment processing rates and pick the better option for different transaction sizes.
LiveShopify Profit Calculator
Estimate product profit after Shopify fees, payment fees, COGS, ads, and shipping.
LiveeBay Fee Calculator
Estimate eBay final value fees, promoted listing costs, net payout, profit margin, and break-even price.
LiveYouTube Creator Tools
Check monetization eligibility, estimate Shorts earnings, calculate RPM/CPM, and price sponsorships.
LiveBuilt for useful answers, not generic widgets.
Each PenguinCalc tool is designed around the exact decision a seller, freelancer, or operator needs to make: how much they keep, what to charge, and which platform costs less.
- Clear assumptions and official source links where fee data matters.
- Reverse calculations for pricing invoices and offers without losing margin.
- Only completed, working tools and focused tool hubs are shown on the homepage.