Guides

Short how-tos for the same jobsite math as the calculators.

Estimates only โ€” not engineering or building-code advice. Open the matching app when you want the numbers done for you.

How-tos

  1. How Many Deck Boards Do I Need?12ร—16 with 5ยฝ" @ โ…›" gap โ‰ˆ 26 rows / buy ~29. Chart + formula.
  2. Stair Stringer Master ReviewRise, run, steps, stringer length. Free one flight; Pro print at $9.99.
  3. How Many Pickets Do I Need?100 ft with 3.5" @ 1.75" gap โ‰ˆ 229 / buy ~252. Chart + formula.
  4. Rebar Takeoff Master ReviewBars, sticks, mesh. Free one slab; Pro extras at $9.99.
  5. How Many Studs Do I Need?12 ft at 16 in OC is 10 studs, not 9. Chart + formula.
  6. Cut List Master ReviewPlywood + lumber nest. Free 4ร—8; Pro export/print at $9.99.
  7. How Much Rebar Do I Need for a Slab?20ร—20 at #4 @ 12 in is ~40 bars / 43 sticks. Chart + formula.
  8. Concrete Mix Master ReviewBags, yards, mix. Free slab; Pro footing/pier/stairs at $9.99.
  9. How Many Bags of Concrete Do I Need?10ร—10 at 4 in is ~56 bags of 80 lb. Chart + formula.
  10. How Many Fence Posts Do I Need?100 ft at 8 ft spacing is 14 posts, not 12. Chart + formula.
  11. Fence Takeoff Master ReviewPosts, gates, quote PDF. Free vs Pro at $9.99.

โ† All calculators