SellerToolSuite
Free calculators and planning tools for marketplace sellers
Access live seller calculators across Etsy, eBay, Amazon, Mercari, Poshmark, and Facebook Marketplace to estimate fees, pricing, profitability, shipping costs, ad performance, and seller growth.
Live multi-platform toolkit
105+ live marketplace seller calculators
SellerToolSuite is now live across multiple selling platforms, with Etsy as the deepest toolkit and additional marketplace systems expanding continuously.
Marketplace tool sections
Choose a marketplace to access live calculators designed specifically for that selling platform.
Etsy
Full Toolkit15 Tools
Complete Etsy seller calculator suite for profit, pricing, shipping, ads, refunds, conversion, and inventory planning.
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eBay
Full Toolkit15 Tools
Live calculators for eBay fees, pricing, shipping, offers, and seller profitability.
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Amazon
Full Toolkit15 Tools
Live tools for Amazon seller fees, margins, fulfillment planning, and product profitability.
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Shopify
Full Toolkit15 Tools
Live tools for Shopify store pricing, fees, ad performance, conversion planning, and overall store profitability.
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Mercari
Full Toolkit15 Tools
Live resale calculators for Mercari pricing, fees, shipping, and seller profit planning.
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Poshmark
Full Toolkit15 Tools
Live seller tools for closet pricing, bundles, offers, shipping, and resale margin planning.
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Facebook Marketplace
Full Toolkit15 Tools
Live local resale calculators for pricing, negotiation, shipping, and inventory planning.
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Popular live tools
Start with some of the most-used calculators across SellerToolSuite.
Etsy Profit Calculator
Estimate real Etsy profit after fees, shipping, packaging, labor, and product costs.
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Etsy Pricing Calculator
Find sustainable listing prices based on margin and profit goals.
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Etsy Ad ROI Calculator
Estimate whether Etsy ads are generating profitable sales.
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eBay Profit Calculator
Estimate eBay seller profit after marketplace fees and shipping costs.
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Amazon Fee Calculator
Estimate referral and fulfillment costs for Amazon listings.
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Mercari Profit Calculator
Estimate resale profitability after Mercari fees and shipping.
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Why use SellerToolSuite?
105+ live seller tools
Practical calculators spanning pricing, profit, shipping, fees, ads, inventory, and planning.
Marketplace-specific systems
Each platform toolkit is built around the fee structures and workflows sellers actually use.
Fast decision support
Get clear estimates and actionable insights before making pricing or scaling decisions.
Built for serious marketplace sellers
SellerToolSuite helps online sellers estimate profitability before pricing products, adjusting shipping, offering discounts, running ads, and scaling inventory across multiple selling platforms.