# VendorCalcs

> Programmatic micro-tools and payment processing fee calculators for e-commerce merchants, marketplace sellers, dropshippers, and small business owners.

## Calculators & Tools

### Payment Gateways & Invoicing
- [Stripe Fee Calculator (US)](https://vendorcalcs.com/stripe-fee-calculator-us/): Calculate domestic credit card processing fees (2.9% + $0.30), international card markups (+1.5%), currency conversion (+1.0%), and reverse invoice pricing.
- [Stripe Fee Calculator (UK)](https://vendorcalcs.com/stripe-fee-calculator-uk/): Calculate UK standard domestic card rates (1.5% + 20p), non-EEA card fees, and reverse gross payouts.
- [Stripe Fee Calculator (Canada)](https://vendorcalcs.com/stripe-fee-calculator-ca/): Calculate Canadian domestic processing fees (2.9% + $0.30 CAD) and cross-border currency conversion.
- [Stripe Fee Calculator (Australia)](https://vendorcalcs.com/stripe-fee-calculator-au/): Calculate Australian domestic rates (1.75% + A$0.30) and international card surcharges (3.5% + A$0.30).
- [Stripe Fee Calculator (India)](https://vendorcalcs.com/stripe-fee-calculator-in/): Calculate Indian domestic card rates (2.0% + ₹0) under RBI guidelines and international cards (3.0%).
- [PayPal Fee Calculator (US)](https://vendorcalcs.com/paypal-fee-calculator-us/): Calculate PayPal US standard commercial rates (2.99% + $0.49), alternative payment methods, and international fees (+1.50%).
- [PayPal Fee Calculator (Canada)](https://vendorcalcs.com/paypal-fee-calculator-ca/): Calculate PayPal Canada domestic transactions (2.90% + $0.30 CAD) and cross-border fees.
- [Square Fee Calculator (US)](https://vendorcalcs.com/square-fee-calculator-us/): Calculate Square online e-commerce rates (2.9% + $0.30) and in-person card-present rates (2.6% + $0.10).
- [Shopify Fee Calculator (US)](https://vendorcalcs.com/shopify-fee-calculator-us/): Calculate Shopify Payments basic rates (2.9% + $0.30) and third-party gateway penalty transaction fees (2.0%).
- [LemonSqueezy Fee Calculator (US)](https://vendorcalcs.com/lemonsqueezy-fee-calculator-us/): Calculate Merchant of Record (MoR) fees (5.0% + $0.50) covering global sales tax remittance and fraud management.

### Marketplaces & Social Commerce
- [eBay Fee Calculator (US)](https://vendorcalcs.com/ebay-fee-calculator-us/): Calculate eBay Final Value Fees (13.25% + $0.30) across standard categories and insertion fee rules.
- [Etsy Fee Calculator (US)](https://vendorcalcs.com/etsy-fee-calculator-us/): Calculate Etsy 6.5% transaction fee, $0.20 listing fee, and 3.0% + $0.25 payment processing.
- [Mercari Fee Calculator (US)](https://vendorcalcs.com/mercari-fee-calculator-us/): Calculate Mercari's 2024/2025 0% seller fee model, buyer fee shift, and $2.00 direct deposit payout fee.
- [Poshmark Fee Calculator (US)](https://vendorcalcs.com/poshmark-fee-calculator-us/): Calculate Poshmark's dual-tier commission: flat $2.95 fee for sales under $15, and 20.0% flat fee for sales $15 and above.
- [Depop Fee Calculator (US)](https://vendorcalcs.com/depop-fee-calculator-us/): Calculate Depop's 0% selling commission and 3.3% + $0.45 payment processing fee.
- [TikTok Shop Fee Calculator (US)](https://vendorcalcs.com/tiktok-shop-fee-calculator-us/): Calculate TikTok Shop's standard 6.0% + $0.30 referral commission fee.
- [Amazon FBA Calculator (US)](https://vendorcalcs.com/amazon-fba-calculator-us/): Calculate Amazon's average 15.0% referral fee plus pick, pack, and weight-handling fulfillment fees.

## Editorial Research Guides

- [Guides Hub](https://vendorcalcs.com/guides/): Comprehensive index of editorial merchant fee research, platform comparisons, and tax compliance playbooks.
- [Stripe vs PayPal vs Square (2026 Comparison)](https://vendorcalcs.com/guides/stripe-vs-paypal-vs-square/): Direct fee comparison of domestic card rates, in-person POS hardware, dispute fees, and international transaction costs.
- [The Reseller's Fee Showdown (eBay vs Poshmark vs Mercari vs Depop)](https://vendorcalcs.com/guides/ebay-vs-poshmark-vs-mercari-vs-depop/): Benchmark comparison of seller fees, 0% models, $15 threshold traps, and net take-home pay.
- [How to Legally Pass Credit Card Fees to Customers](https://vendorcalcs.com/guides/how-to-pass-credit-card-fees-legally/): Legal rules for credit card surcharging, cash discounting, card brand caps (3%), and reverse invoice math.
- [Interchange-Plus vs Flat-Rate Pricing](https://vendorcalcs.com/guides/interchange-plus-vs-flat-rate/): Volume break-even analysis ($10k-$15k/mo) where wholesale interchange-plus beats flat 2.9% + $0.30 rates.
- [Shopify Payments vs Third-Party Gateways](https://vendorcalcs.com/guides/shopify-payments-vs-third-party-gateways/): How Shopify's 2.0%, 1.0%, and 0.6% external gateway transaction penalty fees work.
- [How to Deduct Payment Processing Fees on Schedule C](https://vendorcalcs.com/guides/how-to-deduct-payment-processing-fees-schedule-c/): IRS Form 1040 Schedule C Lines 10 & 27a tax deduction rules and avoiding the 1099-K net payout audit trap.

## Machine-Readable Resources

- [Full Documentation](https://vendorcalcs.com/llms-full.txt): Comprehensive mathematical formulas, interchange regulations, reverse billing equations, and platform rate cards.
- [API Catalog](https://vendorcalcs.com/.well-known/api-catalog): Machine-readable catalog of all calculator endpoints.
- [Sitemap](https://vendorcalcs.com/sitemap-index.xml): XML sitemap of all site pages.
- [Robots.txt](https://vendorcalcs.com/robots.txt): Machine crawler instructions and AI content signals.