Round Bar Weight Calculator
Steel round bar weight by the d²/162 rule, exact density math shown alongside.
d²/162 is the site engineer's most-used mental math — it falls straight out of π/4 × 7850/10⁶. A 16 mm bar: 1.58 kg/m; full 12 m length ≈ 19 kg.
Formula
Round Bar Weight Calculator is a free round bar weight for structural engineers, fabricators and site engineers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Round Bar Weight Calculator
Steel round bar weight by the d²/162 rule, exact density math shown alongside. The calculation implements kg/m = d²/162 (exact: πd²/4 × 7850 × 10⁻⁶) (IS 1786 nominal mass tables). d²/162 is the site engineer's most-used mental math — it falls straight out of π/4 × 7850/10⁶. A 16 mm bar: 1.58 kg/m; full 12 m length ≈ 19 kg.
How to use Round Bar Weight Calculator
- 1Enter Bar diameter in mm.
- 2Enter Total length in m.
- 3Read Weight per metre, Total weight instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Round Bar Weight Calculator?
- ✓Implements the standard formula — kg/m = d²/162 (exact: πd²/4 × 7850 × 10⁻⁶)
- ✓Reference cited on-page: IS 1786 nominal mass tables
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Round Bar Weight Calculator use?+
It computes kg/m = d²/162 (exact: πd²/4 × 7850 × 10⁻⁶), per IS 1786 nominal mass tables. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
d²/162 is the site engineer's most-used mental math — it falls straight out of π/4 × 7850/10⁶. A 16 mm bar: 1.58 kg/m; full 12 m length ≈ 19 kg.
Can I use this for real structural design?+
It implements the exact textbook/code formula cited below the result and is ideal for sizing, checking and learning. Final designs should be verified by a qualified engineer against the full code with all load cases.
Is the Round Bar Weight Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
Related Engineering tools
Reynolds Number Calculator
Compute Re from density, velocity, pipe diameter and viscosity — with instant laminar/turbulent classification.
● LiveLaminar vs Turbulent Flow Classifier
Classify hydraulic-oil or process-fluid flow regime from kinematic viscosity, line velocity and tube bore.
● LiveBernoulli Equation Solver
Solve downstream pressure between two points from velocities, elevations and fluid density (ideal, lossless).
● Live