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 materials, animals, crops, instruments and measurements vary.
• Follow the label for resin, roofing and any other product. A calculator turns your measurements into an amount; it does not choose the product or the method.
• Pet and animal pages are arithmetic about space, size and age, never veterinary advice. Ask a vet about an animal’s health.
• Building sums (domes, roofs, framing) count materials and geometry only; structures need design and local permission where rules require it.
• 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.