Hey Product Hunt community! 👋 I'm excited to launch VendorCalcs — an ad-free, zero-latency payment fee calculator and margin auditing tool for anyone selling online or invoicing clients. Why did I build this? If you've ever sold online or invoiced clients through Stripe or PayPal, you know that payment processors silently eat away at your margins in unexpected ways: The Invoicing Guesswork: How many times have you needed $5,000 in your bank account, sent an invoice for $5,000, and ended up with $4,850? Freelancers and agencies constantly lose margin because of invoice gross-up math. The Refund Bleed: Payment gateways (Stripe, PayPal, Square) keep 100% of their processing fees when you refund a customer. You lose the sale and you still pay the swipe fee. Clunky Legacy Calculators: Almost every fee calculator on Google is plastered with annoying pop-up ads, loads slowly, and uses outdated fee sheets. What VendorCalcs does: • Reverse Invoice Gross-Up: Enter the net payout you want in your bank account, and get the exact dollar amount to bill your client. • 19 Platforms & 5 Global Regions: Up-to-date rate cards for Stripe, PayPal, Square, Shopify, LemonSqueezy, Etsy, eBay, Mercari, Poshmark, plus local rails like India's Razorpay and Cashfree. • Refund Loss Auditor: Calculate your silent annual margin bleed from customer returns in seconds. • Edge-Powered & Private: Built with Astro and Alpine.js on Cloudflare edge. Instant math, zero ads, no sign-up required, 100% free forever. I'd love your feedback: Which payment gateway, marketplace, or regional currency should we add next? Would an embeddable checkout widget or calculator API be useful for your workflow? Thank you so much for checking us out! I'll be in the comments all day answering questions and taking feature requests. 🚀

VendorCalcs

Payment fee & invoice gross-up calculator for sellers

Payment fee & invoice gross-up calculator for sellers