Methods to Estimate Approximate Weight of Steel Bars
Rounds
Multiply diameter of bar by 4. Square the result and divide by 6.
For example: Size 3" rd. — 3 X 4 = 12
12 X 12 = 144
144 6 = 24 Lbs. per foot

Squares
Square the section and add a zero. This gives the weight per yard. Divide by 3 to get weight per foot.
For example:
Size 4" square — 4 X 4 = 16
Add a zero = 160 Lbs. per yd.
160 3 = 53.33 lbs. per foot

Flats
Multiply the width by thickness. Add a zero and divide by 3.
For example:
Size 4" x 1"— 4 X 1 = 4
Add a zero = 40
40 3 = 13.33 Lbs. per foot

Accurate Tool Steel Weight Formulas
D=Diameter
W=Width
T=Thickness
OD=Outside Diameter
Shape Pounds Per Foot Feet Per pound
Round 2.667 x D .3749 x D
Flat 3.396 x W x T in inches .2945 x W x T in inch's
Square 3.396 x D .2945 x D
Hexagon 2.942 x D .3398 x D
Circles .22274 x T x D .
Half Round 1.334 x D .7498 x D
Half Oval 2.647 x W x T in inches .3778 x W x T in inches
Round Tubing 10.6802 x T x (OD - T) .