Bar weight calculator
How much a blank, a foot or meter of bar, or the whole batch weighs — by profile, size and material.
Quick answer
Weight = cross-section area × length × density. Example: 2″ round carbon steel (7.85 g/cm³) ≈ 10.69 lb per foot; Ø50 mm round ≈ 15.41 kg per meter. Hex area = (√3/2) × S².
Result
- Weight of one blank
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- Weight of the batch
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- Weight per meter
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- Weight per foot
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Typical densities for the grade; a particular alloy may differ by 1–3 %.
Who needs it and why
- Quoting a job — metal is sold by weight: what the material for a batch of parts costs.
- Ordering stock — how much bar to order, allowing for parting and the chuck grip.
- Machine and chuck — whether the chuck can hold a long heavy blank without the tailstock, and what RPM to run.
- Shipping — the weight of a box of finished parts or blanks.
The formula
Weight = cross-section area × length × density. Area: round πD²/4, tube π(D² − d²)/4, hex 0.866·S², square S², flat bar B·T. For example, 2″ round steel bar weighs about 10.7 lb per foot.