Sources & checked dates
This is the complete list of outside numbers our calculators rely on. Unit conversions (12 inches to a foot, 27 cubic feet to a cubic yard) are definitions and are not listed.
We re-open each source and update the date when we recheck it. If a manufacturer changes a figure, the calculator changes with it. Spotted a source that's out of date? Tell us at the address in the footer.
QUIKRETE
QUIKRETE® Concrete Mix (No. 1101) — Product Data Sheet
Checked: 2026-09-24
“A 40 lb (18.1 kg) bag yields approximately 0.30 ft3 (8.5 L), a 50 lb (22.7 kg) bag yields approximately 0.375 ft3 (10.6 L), a 60 lb (27.2 kg) bag yields approximately 0.45 ft3 (12.7 L), an 80 lb (36.3 kg) bag yields approximately 0.60 ft3 (17 L) and a 90 lb (40.8 kg) bag yields approximately 0.675 ft3 (19.1 L).”
Used by: Concrete Slab, Fence Post Hole, Sonotube / Round Column, Footing
QUIKRETE
QUIKRETE® 5000 High Early Strength Concrete Mix (No. 1007) — Product Data Sheet
Checked: 2026-09-24
“YIELD • A 50 lb (22.6 kg) bag yields approximately 0.375 ft3 (10.6 L) • A 60 lb (27.2 kg) bag yields approximately 0.45 ft3 (12.7 L) • An 80 lb (36.2 kg) bag yields approximately 0.60 ft3 (17 L)”
Used by: Concrete Slab, Fence Post Hole, Sonotube / Round Column, Footing
QUIKRETE
QUIKRETE® Fast-Setting Concrete Mix (No. 1004) — Product Data Sheet (revised November 2025)
Checked: 2026-09-24
“YIELD • Each 50 lb (22.6 kg) bag yields approximately 0.375 cu ft (10.6 L) • Each 60 lb (27.2 kg) bag yields approximately 0.45 cu ft (12.7 L) … Start by digging the post hole about 3 times the diameter of the post. Hole depth should be 1/3 the overall post height.”
Used by: Concrete Slab, Fence Post Hole, Sonotube / Round Column, Footing
Sakrete
Sakrete 5000 Plus High Early Strength Concrete Mix — Technical Data Sheet
Checked: 2026-09-24
“PACKAGE SIZE YIELD WATER REQUIRED SLUMP RANGE 50 lb 22.7 kg 0.38 ft3 0.011 m3 2.1 qts 2.0 L 2 – 3 in 50 – 75 mm 60 lb 27.2 kg 0.47 ft3 0.013 m3 2.5 qts 2.4 L 2 – 3 in 50 – 75 mm 80 lb 36.3 kg 0.6 ft3 0.017 m3 3.5 qts 3.3 L 2 – 3 in 50 – 75 mm … A general rule of thumb is that the depth should be 1/3 the length of the post or pole and the diameter should be 3 times that of the pole or post”
Used by: Concrete Slab, Fence Post Hole, Sonotube / Round Column, Footing
Sakrete
Sakrete Fast Setting Concrete Mix — Technical Data Sheet
Checked: 2026-09-24
“Post Setting - Based on Average 10” Diameter Hole: … Bag Size Yield Water 50 lb (22.6 kg) 0.38 ft3 (.01 m3) 2.5 to 3 qts (2.4 - 2.9 L) 12” (305 mm) deep 18” (457 mm) deep 1.25 bags 2 bags 24” (610 mm) deep 30” (762 mm) deep 2.5 bags 3 bags”
Used by: Concrete Slab, Fence Post Hole, Sonotube / Round Column, Footing
QUIKRETE
QUIKRETE® QUIK-TUBE® Building Forms (No. 6922) — Product Data Sheet
Checked: 2026-09-24
“QUIKRETE® QUIK-TUBES® are available in 4’ (1.2 M) lengths with 8" (203 mm), 10" (254 mm) or 12" (305 mm) diameters. … Table 1: QUIK-TUBE® Capacity Diameter of QUIK-TUBE®(in) Number of bags depth 6“ 8” 10” 12” # of 60# bags 1 foot 1 1 2 2 # of 60# bags 2 feet 1 2 3 4 # of 60# bags 3 feet 2 3 4 6 # of 60# bags 4 feet 2 4 5 7 # of 80# bags 1 foot 1 1 1 2 # of 80# bags 2 feet 1 2 2 3 # of 80# bags 3 feet 1 2 3 4 # of 80# bags 4 feet 2 3 4 6”
Used by: Sonotube / Round Column
QUIKRETE
QUIKRETE® Quantity Calculator
Checked: 2026-09-24
“All yields are approximate and do not include allowance for uneven subgrade, waste, etc.”
Used by: Concrete Slab, Fence Post Hole, Sonotube / Round Column, Footing
Sakrete
Sakrete Calculators
Checked: 2026-09-24
“PRO TIP: Remember to add 10% to your estimates for safety!”
Used by: Concrete Slab, Fence Post Hole, Sonotube / Round Column, Footing
University of Missouri Extension
Mulches (G6960)
Checked: 2026-09-24
“A 2- to 4-inch layer of most products is needed to insulate the soil effectively and prevent weed growth.”
Used by: Mulch
QUIKRETE
QUIKRETE® Patio Paver Sands (No. 1150-49, -59) — Product Data Sheet
Checked: 2026-09-24
“Excavate the area to a depth of 4 to 7 inches (100 mm to 175 mm) below the desired final grade. … Place 2 to 4 inches (50 to 100 mm) of QUIKRETE® All Purpose Gravel (No. 1151) or crushed rock as an underlayment base. Compact the base material using a tamper. … Spread QUIKRETE® Patio Paver Sand to a depth of 1 to 2 inches (25 mm to 50 mm) over the compacted base.”
Used by: Paver Base
NIST
NIST Handbook 44 (2026), Appendix C — General Tables of Units of Measurement
Checked: 2026-09-24
“1 728 cubic inches (in3) = 1 cubic foot (ft3) 27 cubic feet = 1 cubic yard (yd3)”
Used by: Concrete Slab, Fence Post Hole, Sonotube / Round Column, Footing, Mulch, Paver Base