Estimate the mass of a complete reinforcement-bar bundle from diameter, bar count and bar length. Compare total weight in kilograms, tonnes and pounds and see how changing the bar count changes the load.
Enter the bundle dimensions.
A rebar bundle's theoretical steel mass is the mass of one bar multiplied by the number of bars. Unit mass can be estimated from the nominal diameter using d² ÷ 162.28 kg/m. This makes the tool useful when a schedule gives bar count and length but the total bundle weight has not been written down.
Weight affects lifting plans, vehicle loading, unloading equipment and the practical number of bundles that can be moved in one operation. The calculated value is a planning estimate rather than a certified lifting weight.
A 16 mm bar is approximately 1.577 kg/m. A 12 m bar is therefore about 18.92 kg. Fifty such bars are approximately 946 kg before any non-steel packaging or handling considerations.
A calculated mass does not establish whether a crane, forklift, truck, sling or lifting accessory is rated for the load. Actual handling requires the approved lifting plan and equipment ratings, including dynamic effects and site conditions.
| Diameter | Approx. kg/m | 12 m bar |
|---|---|---|
| 12 mm | 0.887 | 10.64 kg |
| 16 mm | 1.577 | 18.92 kg |
| 20 mm | 2.465 | 29.58 kg |
| 25 mm | 3.851 | 46.21 kg |
| 32 mm | 6.310 | 75.72 kg |
Multiply bar unit weight by bar length and then by the number of bars.
No. The steel calculation concerns the reinforcing bars themselves.
A mixed-diameter bundle should be separated into groups by diameter and calculated independently, then added together.
It is useful for preliminary planning, but lifting decisions must use verified weights and the approved lifting procedure.