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Browse SpecMath construction calculators and trade guides by category. Live tools are linked, while planned tools are listed as upcoming.
Concrete
Framing
Stair Stringer CalculatorBoard Foot / Lumber Calculator - Coming SoonDeck Joist Spacing Calculator - Coming SoonFence Picket Calculator
Roofing
Flooring & Walls
Plumbing
Drainage Slope / Fall Calculator - Coming Soon
Electrical
Voltage Drop / Wire Gauge CalculatorGenerator Sizing Calculator - Coming Soon
Landscaping
Masonry
More tools coming soon.
HVAC
HVAC Load Calculator (Manual J)HVAC Room Load (BTU) Calculator - Coming SoonDuct Sizing Calculator - Coming SoonSEER Savings Calculator - Coming SoonFurnace Sizing Calculator - Coming Soon
Blog Articles
In-depth guides, calculation references, and trade advice for contractors and DIYers.
Concrete
- How to Figure a Concrete Calculator - Complete GuideCalculate cubic yards, bag counts, and delivery quantities for any concrete project.
- How to Calculate Concrete for a DrivewayField-friendly driveway concrete guide covering cubic yards, bag counts, and ready-mix ordering.
- How to Calculate Concrete YardageStep-by-step guide to the cubic yard formula with worked examples.
- How Many Bags of Concrete Per Cubic Yard?Exact bag counts for 40lb, 60lb, and 80lb bags with a full comparison table.
- The 10% Concrete Waste Buffer - Why It MattersWhy contractors always order extra concrete and when to increase to 15%.
- How Thick Should a Concrete Slab Be?Thickness guide for driveways, patios, garage floors, and footings.
- Concrete Slab Cost Guide - What to ExpectMaterial costs, ready-mix pricing, labor rates, and total project estimates.
- Quikrete 80lb vs 60lb Bags - Which Should You Buy?Yield constants, cost per cubic foot, and best use cases for each bag size.
Roofing
- How to Estimate Roofing Shingles Without a DroneGround-level takeoff method with pitch multiplier table for accurate estimates.
Electrical
- Wire Gauge vs Voltage Drop: What Contractors Need to KnowAWG reference table, voltage drop formula, and sizing rules explained plainly.
Landscaping
- Mulch Calculator: How Much Do You Really Need?Coverage table, depth guide, and bulk vs bagged cost comparison.
Framing
- Stair Stringer Calculations Made SimpleRise, run, step count, and stringer length formula with IRC code references.
Career & Trades
- Starting Over at 40: The Best and Worst Construction TradesHonest salary data and career advice for career changers entering the trades.