1 Your measurements

Type feet and inches the way you'd write them, like 12' 6" or 30 3/8. Decimals work too.

ft
ft
in
4" for patios and walkways, 5–6" for driveways and hot tub pads.
%
Covers uneven ground and spills. 5–10% is typical.
$
$

2 What to buy

Concrete needed
1.36 yd³
62 × 80 lb bags, or 36.7 cu ft
80 lb bags
62
or 123 × 40 lb bag, 82 × 60 lb bag
Ready-mix order
1.5 yd³
rounded up to the nearest ¼ yard

That's over 1 cubic yard (about 62 bags of 80 lb mix). Mixing that by hand is a long, hard day. Get a quote for ready-mix delivery or rent a mixer.

Slab area100 sq ft
Volume before waste33.33 cu ft
Volume with waste36.67 cu ft (1.36 yd³)
40 lb bag (US)123 bags
60 lb bag (US)82 bags
80 lb bag (US)62 bags
20 kg bag111 bags
25 kg bag89 bags
30 kg bag74 bags

Shopping list

Powered by Nail the Math