Free Tools
Interactive calculators built for reading and understanding architectural plans, blueprints, and floor plans for beginners — line types and symbols, scale and dimensions, the full drawing set (site plans, floor plans, elevations, sections, details, and schedules), reading and sketching floor plans, drafting by hand and with CAD, designing or choosing a house plan, and the permit and construction-document process. No sign-up, no downloads — enter your numbers and get an answer you can act on.
Blueprint Scale Converter
Convert between drawn and real-world lengths at any architectural scale, from 1/8" = 1' to metric 1:50.
Square Footage Calculator
Add up room dimensions from a floor plan to get per-room and total square footage, with square meters included.
Roof Pitch Calculator
Turn a rise-over-12 roof pitch into its angle, pitch multiplier, and rafter length for any run.