Contact the developer

Found a calculation that needs another look, a confusing control, or a material reference worth correcting? Email me directly.

Help me reproduce the problem

For a calculation issue, include the amount, input and result units, material, and density with its unit. Tell me what the calculator displayed and what you expected. A supplier reference is helpful when the concern is a material density.

If the page is hard to use, mention your device and browser, the steps you took, and a screenshot if useful. Please remove names, addresses and other private information from screenshots and notes.

Other questions

Suggestions, accessibility feedback and privacy requests are welcome at the same address. I maintain the tool as a single developer. For an order, delivery arrangement or actual material specification, confirm the details with your supplier.

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