SSellerMath

Every calculator you need to sell profitably

Free, instant and private — every calculation runs in your browser, nothing is uploaded and no account is needed. Pick a tool below.

Platform fees

⚡Marketplace Fee Calculator 2026One price, all referral & payment fees live 🧶Etsy Fee CalculatorListing, transaction & payment fees with break-even 📦Amazon FBA CalculatorReferral, fulfillment, storage, ROI & peak fees ⚖️FBA vs FBM CalculatorCompare fulfillment profit & break-even 🏷️eBay Fee CalculatorFinal value fees by category & profit 🛒Shopify Profit CalculatorCard fees, plans, monthly margin 📦Dropshipping Profit CalculatorNet margin, break-even CAC & ROAS per order ⚡AI Pricing CopilotOne cost, the right price on all 5 platforms & where to sell first 🎵TikTok Shop Calculator6% referral, creator commission 🛍️Mercari Fee CalculatorFlat 10% incl. buyer shipping, payout 👗Poshmark Fee Calculator$2.95 under $15, 20% above 💖Depop Fee CalculatorUS/UK: no selling fee, 3.3% + $0.45 👥Facebook Marketplace Calculator10% shipped, 0% local pickup 📋Amazon Referral Fee by CategoryInteractive 2026 referral fee tool 📝eBay Insertion Fee CalculatorFree listings & $0.35 after 👗Vinted Fee Calculator0% seller fees — keep 100% of every sale 🏪Bonanza Fee Calculator3.5% FVF + $0.25, optional ad tiers 📱OfferUp Fee Calculator0% local, 12.9% shipped

Getting paid

💸PayPal Fee Calculator3.49% + fee, international, reverse 💳Stripe Fee Calculator2.9% + 30¢, international & FX ⬜Square Fee CalculatorIn-person 2.6%+15¢, online 3.3%+30¢

Pricing & ads

📈Profit Margin CalculatorMargin vs markup, target price 🎯ROAS CalculatorReturn on ad spend & break-even 💎LTV:CAC CalculatorLifetime value, ratio & payback period 📈Ecommerce Conversion CalculatorCVR, AOV & cart abandonment 📦Reorder Point CalculatorSafety stock, ROP & days to stockout ⚖️Break-Even CalculatorUnits & revenue to be profitable 🏛️Sales Tax CalculatorUS state rates & reverse lookup 🇺🇸Sales Tax by State50 states + DC, each with calculator 📊Amazon ACoS CalculatorBreak-even ACoS, TACoS & ROAS 💰Etsy Profit CalculatorNet income after all 2026 Etsy fees

Etsy by country

🇬🇧Etsy UK CalculatorPounds (£), UK payment rates 🇦🇺Etsy Australia CalculatorAustralian dollars (A$) 🇨🇦Etsy Canada CalculatorCanadian dollars (C$)

Compare platforms

⚔️Etsy vs eBay FeesSame sale, exact fees & net on each 🔍PayPal vs Stripe FeesInternational, FX & keyed-in options 🧭Etsy vs Shopify CostsMonthly orders, subscription break-even 🤝Mercari vs Poshmark FeesResale payouts, 10% vs 20% 🏷️Poshmark vs eBay Fees20% vs 13.6%, exact payouts 👗Poshmark vs Depop Fees20% vs 0% commission, US & UK 🎥Whatnot vs eBay FeesLive selling vs marketplace, cap at $1,500 👟StockX vs GOAT FeesSeller levels vs ratings, sneaker take-home 🛒Walmart Marketplace FeesReferral by category + WFS, profit & break-even 🥊eBay vs Amazon Fees13.6% vs 8-15% referral, exact cost ⚡eBay vs Etsy Fees~14% vs ~10-11% all-in 🎨Etsy vs Amazon HandmadeArtisan marketplace fee comparison 💚Vinted vs Poshmark Fees0% vs 20% commission, exact math 👗Vinted vs Depop Fees0% vs 0%+processing, same sale 🏪eBay vs Bonanza Fees~15% vs 3.5%, massive savings

Reseller tools

💰Resale Profit CalculatorThrift flip ROI, margin & all-in costs 👕Grailed Fee Calculator6%/9% commission & Stripe payout 🚚Shipping Cost CalculatorUSPS vs UPS vs FedEx estimate 🔁Return Cost CalculatorHow returns eat net revenue & profit 📊Sell-Through CalculatorSTR, turnover, days in stock, carry cost 🇬🇧UK VAT CalculatorAdd or remove 20% / 5% VAT 📦COGS CalculatorCost of goods sold & landed unit cost 🏷️Markup vs MarginConvert markup to margin & set price 💲Pricing Strategy Calculator4 modes: cost-plus, margin, competitive, .99

2026 Fee Guides

📦What Is Amazon Referral Fee?8-15% commission explained with calculator 🏷️What Is eBay Final Value Fee?13.25% average FVF explained with calculator 🛒How Much Does Shopify Cost?Plans, payments & the 2% gateway surcharge 📋Shopify Plans ComparedBasic vs Advanced fees at a glance 🔌Shopify Third-Party Gateway FeeWhen the extra transaction fee applies 📦Amazon Referral Fee Categories8% to 45% by product type in 2026 📋Amazon Referral Fee CalculatorInteractive tool by category 📮Amazon FBA Fees on a Small ItemReferral + fulfillment on one unit 🏷️eBay Final Value Fee 202613.6% standard rate and per-order fee 📝eBay Insertion Fee Calculator250 free, then $0.35/listing 🏬Is an eBay Store Worth It?Lower FVF vs the monthly subscription 🧶Etsy Fees on a $100 SaleListing, transaction & payment breakdown 📣Etsy Offsite Ads Fee12% or 15% and who really pays 💳PayPal Goods & Services Fee3.49% + fixed fee for sellers ⚖️PayPal vs Stripe for Small BusinessExact cost on the same invoice 🌍Stripe International Card SurchargeCross-border and currency-conversion fees 🛒Walmart Referral-Only FeesNo monthly subscription, fee by category 🥊Walmart vs Amazon Selling FeesReferral and fulfillment side by side 🗺️Sales Tax Nexus ThresholdsEconomic nexus limits in every state 🧵Etsy Fees on a $50 SaleExact fees and net payout 🧵Etsy Fees on a $25 SaleExact 2026 fee breakdown 🧵Etsy Fees on a $200 SaleHigher-value sale breakdown 📮FBA Fees on a $20 ItemReferral and fulfillment total 📮FBA Fees on a $30 ItemNet before product cost 🏷️eBay Fees on a $50 SaleFVF and per-order fee 🏷️eBay Fees on a $100 SaleExact 2026 final value fee 💳PayPal Fee on $503.49% + $0.49 charged 💳PayPal Fee on $200How much actually arrives 💠Stripe Fee on $1002.9% + $0.30 and payout 💠Stripe Fee on $500Higher charge fee breakdown 📦Amazon FBA Fee Calculator 2026Interactive referral + fulfillment tool 🏷️eBay Fee Calculator 2026Interactive FVF + per-order tool 🧶Etsy Fee Calculator 2026Interactive listing & transaction tool 💳PayPal Fee Calculator 2026Interactive Goods & Services tool 💠Stripe Fee Calculator 2026Interactive processing tool 🛒Walmart Fee Calculator 2026Interactive referral-only tool 🛍️Shopify Fee Calculator 2026Interactive payments tool 📦Dropshipping Fee Calculator 2026Interactive referral + payment tool 🎵TikTok Shop Fees by Category2–8% referral by product type + $0.30 🏭FBA Storage Fee CalculatorMonthly & peak rates by size tier

2026 Tax Overview

🗺️Sales Tax by State 2026All 50 states rates + nexus thresholds

Compare platforms

⚖️Etsy vs eBay Fees~10% vs ~14% all-in ⚖️Etsy vs Shopify Costs~10% vs $27/mo + card fees ⚖️Walmart vs Amazon FeesReferral, fulfillment & total cost compared ⚖️Mercari vs Poshmark10% vs $2.95/20%

Run a blog or seller site? You can embed our free Etsy calculator on your own page with one snippet — see the embed widget.