Tools
32
Core calculators
Stairs, roofs, framing, spans, lumber, and material quantities with printable outputs.
Construction math, exposed
Measure the job.
See the math.
Make the cut.
BuildMath provides free construction calculators with server-rendered numerical results, scaled SVG diagrams, printable charts, and source-linked code notes. Every formula remains readable in ordinary HTML, while lightweight browser JavaScript updates the result as measurements change.
Reference
24
HTML + PDF charts
Complete tables for fractions, pitch, slope factor, spans, fasteners, and jobsite conversions.
Sources
6
Code guides
Direct source links and measurement notes for stairs, access, workplaces, and wood spans.
Start with the low-friction references
Charts that answer the question before the script loads
Inch Fraction to Decimal Chart
A two-way decimal to fraction chart covering sixty-fourths of an inch, decimal inches, millimetres, and percentage.
Slope Factor Chart
Roof pitch multiplier chart for converting plan area or horizontal run into sloped length.
Board Footage Chart
Board foot chart for common thicknesses, widths, lengths, and quantities.
Roof Pitch Angle Chart
Roof pitch to degrees chart with slope factor and rafter length for a 12-inch run.
Lineal Feet to Board Feet Chart
Lineal-foot conversion table for common hardwood thicknesses and widths.
Log Scale Chart
Example comparison table for Doyle, Scribner, and International quarter-inch log rules.
iPhone companion
Keep jobsite math available offline
The website calculators and charts stay free. The BuildMath iPhone app keeps its supported construction calculations available when the jobsite has no connection.
BuildMath — coming soon to the App Store