Calculator Disclaimer
Use the calculators as quick checks only.
Guidance only
All calculator results are estimates based on the values entered and the simple formula shown on each page. They do not account for every real-world condition, project risk, contractual requirement, design assumption or site constraint.
Check before relying
Before using any output for ordering, reporting, programme decisions, commercial submissions or contract notices, check the result against the relevant drawings, specifications, supplier information, contract wording and professional advice.