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) | . |