Concrete Volume Calculator - News
The sort of thing that encouraged them was a calculation made by the American Road Builders Association that each additional billion dollars budgeted for highway construction would call for 16 million barrels of cement, 510000 tons of steel,
DIY Concrete Volume Calculator and Volume Formulas
If you want to develop a gut feeling for estimating quantities manually, use the concrete volume calculator formulas below and you will be able to calculate the concrete volume for your pour.
Please note that these formulas apply to structures that are either circular or cylindrical (column)-shaped.
Concrete volume calculations are more involved than those for a square or rectangular slab. Stick with me and all will be OK .
Please review and write down, or print-out the concrete volume calculator formulas and examples.
Always check your calcs twice!
If you are not interested in learning to figure concrete volume manually, or you are in a rush , just download my handy concrete volume & cost calculator gadget and you'll have it to use whenever you need it.
Some basic info...Concrete is calculated in cubic yards (one cubic yard = 27 cubic feet).
Concrete can be be ordered in ready-mixed cubic yards or mixed on-site in 60 or 80 lb. bags, which are the most commonly used bag sizes.
Concrete volume calculator formulas for circular or column-shaped structures, bag and cubic yardage:(3.14 x r (feet) x r (feet) x (T (inches) / 12)) = cubic feet of concrete (CF)
Number of bags of concrete needed
CF / 0.45 = number of 60 lb. bags
CF / 0.6 = number of 80 lb. bags
Number of cubic yards of concrete needed:
CF / 27 = cubic yards
Formula Stuff:
/ = divided by
r = radius of the circle in feet (1/2 of the diameter)
T = Thickness in inches
CF = Cubic feet of concrete
Fixed Mathematical Values:
3.14 = pi (180 radians)
1728 = # of cubic inches in a cubic foot
Example 1: Circular-Shaped Slab CalculationsA circular slab 6" thick where the circle has a radius of 6' (12' diameter circle)
((3.14 x 6' x 6') x (6" / 12")) = 56.5 cubic feet of concrete
56.5 / 0.45 = 126 (125.6) 60 lb bags of concrete
56.5 / 0.60 = 95 (94.2) 80 lb. bags of concrete
56.5 / 27 = 2.09 cubic yards of concrete
(it's best to round bag quantity up to at least the next bag to be certain that enough concrete will be available)
Example 2: Column-Shaped (column, footing)Calculations80 lb.
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