Free seller tools

Genuinely useful calculators for marketplace sellers — no sign-up, no catch. Built by the team behind Synqro, the AI command centre for ecommerce.

eBay Fee Calculator

Work out your real take-home after eBay final value fees, postage and your costs.

Profit Margin Calculator

See true net profit and margin once material, labour, postage and fees are in.

SKU Generator

Generate clean, consistent SKUs for your products in seconds.

Want these numbers tracked automatically across every order?

Synqro tracks true profit, repricing and stock across all your marketplace accounts.