About ToolsNode

ToolsNode is a small collection of free calculators and converters for people who make, sell, and ship things — print buyers, packaging folks, Etsy and Shopify sellers, marketers.

It started from a simple frustration: most online calculators hide their math. You type numbers in, a result pops out, and you have no idea what formula ran or what assumptions it made. That's fine for splitting a dinner bill. It's not fine when you're quoting a 5,000-unit print run.

So every tool here shows its formula, labels its assumptions, and dates its sources. If a number looks off, you can check our work — that's the point.

The site is run by ToolsNode, based in Karachi, Pakistan. Tools are reviewed on a rolling schedule; each page shows when its figures were last verified. If you spot an error, email [email protected] — corrections to verified mistakes go live within 48 hours.