Rebar Weight Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the bar diameter (mm) and length per bar (m).
- Optionally set the number of bars for the total.
How it works
Steel rebar weighs about d² ÷ 162 kg per metre (d in mm). Multiply by length and quantity for the total mass.
Worked example
12 mm bar, 6 m. ≈ 0.889 kg/m, so about 5.33 kg per bar.
Common mistakes
- Entering the diameter in cm or metres — it should be millimetres.
- Forgetting laps and wastage when ordering.
Frequently asked questions
Where does ÷ 162 come from?
It's the steel-density shortcut: area (πd²/4 mm²) × 7850 kg/m³ works out to about d² ÷ 162 kg per metre.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.