Updated 19 September 2026.
Purpose of the tools
The calculators provide arithmetic estimates for planning and checking quantities. Results depend on your inputs and the assumptions described on each page. They are not certified quantities, quotations, structural calculations or instructions to carry out construction work.
Your project information
Check dimensions, units, product yields, current prices and scope before relying on a result. Use the project’s applicable standards, specifications and approved drawings. Professional review may be required from a qualified quantity surveyor, engineer or other responsible specialist.
Structural and material limitations
Reinforcement ratios and lap multipliers entered here are estimating assumptions. They do not establish required reinforcement, load capacity, safe lap lengths or code compliance. Geometric models exclude items identified in each calculator’s notes.
Availability and accuracy
The tools are supplied as available. No guarantee is made that they are complete or suitable for every project. Correct errors you identify before using their results and report reproducible issues to [email protected]. Nothing in these terms excludes rights or liabilities that cannot lawfully be excluded.
Publisher details
The site is operated by Kattegat Studio, CVR 46761952, Dræsinen 18, 1. th, 2640 Hedehusene, Denmark. Contact: [email protected]. No professional accreditation is asserted by these tools.