Measuring and estimating guides
How to measure real projects and turn the numbers into a shopping list.
July 26, 2026
What Size AC and Furnace Do I Need?
Room AC runs about 20 BTU per square foot; furnaces 30 to 60 depending on climate. How to size cooling, heating, and the water heater without oversizing.
July 26, 2026
How Many Sheets of Plywood for a Subfloor?
A 12x12 room takes about 5 sheets of 4x8 subfloor plywood with waste. Sheet counts by room size, plus thickness, screws, and adhesive per sheet.
July 25, 2026
How Much Insulation Do I Need? R-Values by Room
Attics want R-38 to R-60, 2x4 walls R-13 to R-15, 2x6 walls R-19 to R-21. The R-value targets by climate, plus how many batts or bags a room takes.
July 20, 2026
How Many Sheets of Drywall for a 12x12 Room?
A 12x12 room with an 8 ft ceiling takes about 17 sheets of 4x8 drywall including the ceiling, or 12 for walls only. Sheet counts by room size, plus compound, screws, and tape.
July 20, 2026
How Many Fence Posts Do I Need?
Fence posts, pickets, rails, and concrete by fence length: a 100 ft privacy fence needs 14 posts, about 219 pickets, and 28 bags of concrete. Tables and spacing rules inside.
July 18, 2026
Paver Patio Base: How Much Gravel and Sand
The layer-by-layer material breakdown for a paver patio: excavation depth, compacted gravel base, bedding sand, and joint sand, with real quantities.
July 18, 2026
How to Measure Your Yard for Mulch, Gravel, or Sod
A practical guide to measuring lawn and bed areas for bulk materials: breaking irregular shapes into rectangles, handling curves and slopes, and converting to cubic yards.
July 18, 2026
How Much Gravel Do I Need for a Driveway?
A single-car gravel driveway needs about 6 to 9 tons per 40 feet of length, built in compacted layers. Ton and cubic-yard tables by driveway size, plus the layer-by-layer build.
July 18, 2026
How Many Bags of Concrete for a 10x10 Slab?
A 10x10 slab at 4 inches thick takes about 62 bags of 80 lb concrete, or 1.36 cubic yards of ready-mix. Full bag counts by thickness and slab size, plus when to order a truck instead.
July 18, 2026
Bags vs Ready-Mix Concrete: Which to Buy
When bagged concrete makes sense, when to call for ready-mix, and how to convert between bags, cubic feet, and cubic yards without over-ordering.