HIGHWAY QUALITY TEST
(Highway Engineering • Testing • Performance Assurance)
The Rebar Weight Calculator helps civil engineers, contractors, and construction professionals quickly calculate reinforcement steel weight used in structural elements such as slabs, beams, columns, and footings.
Accurate steel estimation is important in construction because reinforcement steel contributes a significant portion of the project cost. This calculator uses the standard engineering formula widely used in construction practice.
The standard formula used to calculate steel weight per meter is:
Steel Weight (kg/m) = D² / 162
Where:
To calculate total steel weight:
Total Steel Weight = (D² / 162) × Length
Suppose we have a reinforcement bar with diameter 12 mm and total length of 50 meters.
Steel weight per meter:
12² / 162 = 0.888 kg/m
Total steel weight:
0.888 × 50 = 44.4 kg
Therefore, total steel required is approximately 44.4 kg.
| Bar Diameter (mm) | Weight per Meter (kg) |
|---|---|
| 6 mm | 0.222 kg |
| 8 mm | 0.395 kg |
| 10 mm | 0.617 kg |
| 12 mm | 0.888 kg |
| 16 mm | 1.58 kg |
| 20 mm | 2.47 kg |
| 25 mm | 3.86 kg |
| 32 mm | 6.31 kg |
The most commonly used formula is:
D² / 162
Where D is bar diameter in millimeters.
The constant 162 is derived from the density of steel (7850 kg/m³) and unit conversion factors used in engineering calculations.
A 12 mm diameter bar weighs approximately 0.888 kg per meter.
A 16 mm bar weighs approximately 1.58 kg per meter.
The Rebar Weight Calculator is an essential tool for civil engineers, quantity surveyors, and contractors involved in structural construction projects.
By quickly estimating reinforcement steel weight, professionals can prepare accurate material estimates, reduce wastage, and control project costs.
