Construction Calculator Blog
Guides, trade tips, and honest takes on construction math.
Guides
How to Calculate Concrete for a Slab
Step-by-step concrete slab calculation with the cubic yard formula, waste factors, and when bags beat ready-mix. Real math, no fluff.
GuideStud Count Calculator: How Many Studs Do I Need?
Calculate wall studs for any layout. Spacing formula, corners, king and jack studs for openings, plates, and blocking. The full count.
GuideHow to Calculate Roof Area from Pitch
Pitch multiplier table, footprint-to-actual-area formula, and how to figure squares for roofing. Every roofer needs this math.
GuideRebar Calculator: How Much Rebar for a Slab
Calculate rebar quantity for concrete slabs. Spacing in both directions, bar weight, lap splice lengths, and ACI 318 references.
GuideVoice Input for Construction Calculators
How SiteCalc's voice input parses spoken dimensions, strips filler words, and handles fractions. Why it matters on a job site.
Comparisons
SiteCalc vs Construction Master Pro Comparison
Side-by-side comparison of SiteCalc and Construction Master Pro calculator apps. Pricing, features, calculator count, and what each does better.
ComparisonConstruction Calculators Without Subscriptions
Why subscription pricing for construction calculator apps is wrong, and what the backlash against Construction Master Pro's model means.
Trade Articles
How to Size Wire for a Circuit
NEC 310.16 ampacity table explained, voltage drop formula, and when to upsize wire. Practical guide for electricians and DIYers.
TradeHow to Size a Header (IRC Table R602.7)
IRC header sizing for residential construction. Full R602.7 table explained, load conditions, snow load, and why your 2x6 might fail.
TradeDrain Pipe Sizing with DFU Tables (IPC 710.1)
How to size drain pipes using DFU values from IPC Table 709.1 and pipe sizing from IPC 710.1. Slope requirements and fixture counts.