Disclaimer

Every calculator on this site gives an estimate from a standard formula and the numbers you enter. Results are for planning, learning and checking your own work.

• A result is only as good as its inputs and the formula’s assumptions. Real engines, circuits, materials, weather and people vary.
• Results are not professional advice. For electrical installations, pressure systems, lifting, vehicles, chemistry outside a teaching lab or anything where an error could cause harm or cost money, confirm the figures with a qualified professional and follow local rules and the manufacturer’s instructions.
• Rules of thumb (food per guest, ice per guest) are averages. Adjust them for your situation.
• The site does not give medical, legal, tax or financial advice.

If you think a result is wrong, please tell us through the contact page. See how the calculators work for rounding rules and limits.