01 / DRAWING
Scale converter
Convert a real-world length to its drawn length at a chosen scale.
Examples & formulaTHE WORKING TOOLKIT
Useful by design.
Small, free tools for everyday architectural work. Calculations run in your browser; no files or project information are uploaded.
GAD / REFERENCE LIBRARY
Professional tools & resources
98 source-linked records
Explore the collectionThree GAD calculators
02 / MEASUREMENT
Area converter
Move between square metres and square feet with a consistent conversion factor.
Examples & formula03 / EARLY PLANNING
Floor-area ratio
Explore the arithmetic relationship between floor area and site area.
Examples & formulaThese are arithmetic tools, not planning or code-compliance assessments. Local definitions of floor area and permitted ratios vary; use the applicable authority’s rules for a real project.