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 D² |
.3749 x D² |
| Flat |
3.396 x W x T in inches |
.2945 x W x T in inch's |
| Square |
3.396 x D² |
.2945 x D² |
| Hexagon |
2.942 x D² |
.3398 x D² |
| Circles |
.22274 x T x D² |
. |
| Half Round |
1.334 x D² |
.7498 x D² |
| 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) |
. |