Free Construction & Trade Calculators
Estimate materials.
Save money.
Build right.
Fast, accurate calculators for construction, electrical, landscaping, and surface projects - built on DOT and NEC reference data.
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Free Calculators
4
Trade Categories
NEC
Code Tables
DOT
Reference Data
CalcShed is a free library of 0+ construction and trade calculators for concrete, electrical, landscaping, and surface materials. Every calculator shows its formula and source standards (ACI, NEC, ASTM, DOT data) so you can verify the math, not just take a number.
Browse by Category
0 Calculators
Construction
Concrete, asphalt, gravel, sand, pavers, brick, drywall, siding, and roofing tools.
0 Calculators
Electrical
Conduit fill, wire sizing, voltage drop, load calculation, and reference tools.
0 Calculators
Landscaping
Mulch, topsoil, compost, sod, lawn seed, and yard material estimates.
0 Calculators
Surface
Paint, flooring, tile, and stain coverage calculators.
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Why CalcShed
Reference-First Data
Calculations are built from published tables and standard unit conversions. We cite assumptions and show formulas instead of hand-waving.
Built for Mobile
Fast inputs, clear outputs, and no external libraries. The calculators are designed to work well on-site, not just on a desktop.
Transparent Methodology
We document formulas and assumptions so you can sanity-check results. See our Methodology and Data Sources pages for the details.