Calculators

All of these run in your browser. Nothing is uploaded, there is no sign-up, and the URL carries your inputs so you can bookmark or share a result.

Print and design

Book cover size calculator

Spine width, full wrap dimensions and the pixel canvas for any trim size, page count and paper stock.

Fees and margin

Etsy fee calculator

Itemised fees, net payout, profit and margin on any price and cost.

eBay fee calculator

Itemised fees, net payout, profit and margin on any price and cost.

Amazon fee calculator

Itemised fees, net payout, profit and margin on any price and cost.