Construction & DIY Calculators
20 free contractor-grade calculators for materials estimation: concrete, lumber, paint, roofing, decks, stairs, and HVAC math, all using 2026 average material costs and code-compliant rules.
Concrete & masonry (6)
Bag-count and yardage math for any pour, plus block-count for foundations and retaining walls.
- › Concrete Bag Calculator
How many 60lb, 80lb, or 90lb premix bags for any project.
- › Concrete Block Calculator
CMU blocks needed for any wall length and height.
- › Cubic Yard Calculator
Volume for concrete, mulch, gravel, or fill material.
- › Asphalt Calculator
Tons of asphalt needed for a driveway or parking lot.
- › Loam Calculator
Cubic yards of topsoil for landscaping projects.
- › Mulch Calculator
Cubic yards or bags of mulch for any bed size and depth.
Lumber & framing (2)
Board feet, dimensional lumber, and structural framing math.
- › Board Foot Calculator
Lumber volume in board feet from rough or finished dimensions.
- › Square Footage
Floor or wall area for any room shape (rectangle, circle, L).
Decks & stairs (2)
Design-rule compliant stair stringers and complete deck-build costing.
- › Stair Calculator
Risers, treads, and stringer length following IRC code.
- › Deck Cost Calculator
Total cost by deck size, material (PT pine to ipe), and labor.
Roofing (2)
Roof area and pitch calculations for shingle estimates.
- › Roofing Calculator
Roof area, shingle bundles, and material cost for any pitch.
- › Roof Pitch Calculator
Convert between rise/run, angle, and slope percent.
Finishes & coatings (3)
Paint, wallpaper, and flooring quantity math with waste-factor adjustments.
- › Paint Calculator
Gallons needed for interior and exterior projects with door/window deductions.
- › Wallpaper Calculator
Rolls of wallpaper for any room with pattern-repeat adjustment.
- › Flooring Calculator
Carpet, tile, hardwood, or vinyl quantities with waste factor.
HVAC & electrical (5)
Heating/cooling capacity, electric load, and Ohm's Law calculations.
- › BTU Calculator
AC and heating size by room square footage and climate.
- › Electricity Calculator
Monthly electric bill estimate by appliance usage.
- › Watts / Amps / Volts
Ohm's Law conversions plus wire gauge guide.
- › Voltage Drop Calculator
Voltage drop and percent drop over a wire run (copper or aluminum).
- › Solar Calculator
How many solar panels and lifetime cost savings for your home.