Construction Calculator: DIY

Construction Calc is a free construction calculator for DIY projects and home improvement. Work out how much material to buy before you go to the store: paint, flooring, tile, drywall, concrete, roofing shingles, mulch, gravel, pavers, bricks, cinder blocks, lumber, stairs, fence, insulation, plus AC, water heater and wire sizing.

PAINT & WALLS
• Paint calculator: gallons or litres for walls and ceiling, minus doors and windows, any number of coats, with a gallons-plus-quarts shopping list
• Drywall calculator: sheets of 4×8, 4×10 or 4×12 for walls and ceiling
• Square footage calculator: several rooms in feet and inches or metres

FLOORS & TILE
• Flooring calculator: boxes and cost of laminate, vinyl plank, hardwood or carpet, with waste for straight, diagonal or herringbone layouts
• Tile calculator: tiles and boxes for floors, walls, showers and backsplashes, including the grout joint

CONCRETE & OUTDOORS
• Concrete calculator: cubic yards and 40, 50, 60 or 80 lb bags for slabs, footings and post holes
• Gravel calculator: tons and cubic yards for driveways and paths
• Mulch calculator: cubic yards and bags of mulch, topsoil or compost
• Paver calculator: pavers plus gravel base and bedding sand
• Fence calculator: posts, rails, pickets and concrete for the post holes

ROOF, STAIRS & MORE
• Roofing calculator: roof area from house size and pitch, roofing squares and shingle bundles
• Roof pitch calculator: pitch as x/12, angle in degrees, percent slope and rafter length
• Insulation calculator: attic R-value to add for your climate zone, depth and bags
• Stair calculator: number of steps, riser height, total run, stringer length and angle, checked against common code limits
• Brick calculator: bricks for a wall by brick size and mortar joint
• Cinder block calculator: concrete blocks per wall, courses and waste
• Board foot calculator: lumber volume and price
• BTU calculator: air conditioner size for a room

HVAC, PLUMBING & ELECTRICAL
• AC tonnage calculator: central AC or heat pump size in tons and BTU for a whole house
• Water heater size calculator: tank first hour rating or tankless GPM and kW
• Wire size calculator: AWG gauge for amps and distance (NEC ampacity + voltage drop)
• Voltage drop calculator: volts and percent lost on a copper or aluminum run

WHY CONSTRUCTION CALC
• US and metric units in every tool: feet and inches or metres, gallons or litres, tons or tonnes
• Type measurements the way you take them, like 12'6"
• Every calculator explains the formula, with worked examples and common mistakes
• Calculations run on your phone; your numbers are never uploaded
• Light and fast: one construction calculator app instead of ten

Results are estimates for planning. Check product labels, local building codes and a professional for structural work.