A small set of free tools, built by someone who sells online and got tired of guessing at margins.
Last updated: 13 November 2026
Most sellers know their selling price and their product cost. Very few know their profit. Between those two numbers sit the referral fee, the closing fee, 18% GST on every fee, shipping, packaging, ad spend and returns that never come back — and each one behaves differently at different price points.
So a ₹499 product can make ₹190 on one listing and ₹50 on another, with the same supplier and the same photos. Seller Success Lab exists to make that visible in about thirty seconds, without a spreadsheet.
Free calculators, each one answering a single question an Indian seller actually asks:
Every calculator runs entirely in your browser. The numbers you type are never sent to a server, never stored, and never tied to you. There is no signup, no account and no email gate — you can use every tool and leave.
The tools are free and will stay free. Revenue comes from paid work: listing audits, catalogue photography and seller consulting for brands that want the deeper help. If a tool saves you money, that is the whole point — and if you later want hands-on help, you will know where to find us.
We are not Amazon, Meesho, Flipkart or any marketplace, and we are not affiliated with them. We are not chartered accountants, lawyers or financial advisers. Our calculators give you estimates to make better decisions with — the final number always comes from your own Seller Central or Supplier Panel, and from your CA.