About EverySolver

EverySolver is a growing set of free calculators that solve real work problems in plain numbers. The first section covers manufacturing and cost, for people who make and buy physical products: plant managers, cost accountants, buyers, importers and small makers. Each one answers a single cost question in plain numbers and shows the formula it uses, so you can check the result or rebuild it in a spreadsheet.

The calculators were written by someone who spent more than a decade developing production equipment and later worked in cost management, and kept rebuilding the same spreadsheets for every new project. The aim is to save you that time.

How the numbers work

All calculations run in your browser. Nothing you type is sent to a server or stored, except your currency choice, which your browser remembers for the next visit.

The results are estimates for planning. Duty rates, tax rules and accounting conventions vary by country and company, so confirm important figures with your customs broker, accountant or finance team.