Use the tools. Verify the work.

You may use the calculators, guides and other pages for lawful personal, educational and planning purposes. Do not interfere with the service, attempt to bypass security controls, or use automated activity that harms availability.

Calculator results are estimates for planning and material takeoff purposes. Actual quantities can vary because of waste, site conditions, material specifications, supplier practices, measurement error and local requirements.

A result should not be treated as a guaranteed quantity, quote, engineering design or construction instruction.

Structural work, permits, building-code compliance, reinforcement design and professional construction decisions remain the responsibility of the user and appropriate qualified professionals.

Always verify local code requirements, manufacturer instructions and supplier specifications before ordering or building.

Any cost figures are estimates and can change by location, supplier, delivery charge, market conditions, taxes and project requirements. CountMaterials does not guarantee a supplier's price or availability.

We work to document formulas, constants and worked examples and to correct errors when identified. If you find a questionable result, please report the calculator, inputs, units and expected result so it can be investigated.

CountMaterials may link to manufacturers, reference organizations, advertisers or merchants. Those third parties operate under their own terms and policies. We are not responsible for third-party products, services or external content.

The site may display advertising and may contain affiliate links. Advertising or affiliate relationships do not guarantee, endorse or alter the calculator result.

CountMaterials branding, original text, interface design, calculator presentation and site code are protected by applicable intellectual-property rights. You may use the results for your own planning, but may not reproduce or republish substantial portions of the site without permission.

To the extent permitted by law, CountMaterials is not liable for losses arising from reliance on an estimate, including material shortages, excess purchases, construction defects, delays, project costs or decisions made from calculator output.

These terms may be updated as the site evolves. Continued use of CountMaterials after an update means you accept the revised terms.

Last updated: August 2026.