TryBuildCalcSteel Weight Calculator(TMT Bar Weight per Meter & Total)
Calculate steel bar weight instantly.
Calculate steel bar weight from diameter, length, quantity, and wastage. Adjust diameter, length, quantity, and wastage for your steel takeoff.
🕒 Last updated: August 11, 2026
Weight per Bar (kg)
88.889 kg
0.889 kg/m
Total Weight
88.89 kg
Final Weight
(Including Wastage)
88.89 kg
Approx. 11 bars per ton (1000 kg)
Steel weight calculation
This page gives a general steel weight calculator setup for TMT bars used in RCC work.
The calculator is pre-filled for this steel weight use case. Edit any input and the worked example will update from the active values.
- Default diameter: 12 mm.
- Default length: 100 m.
- Uses D²/162 formula.
How does this steel weight calculator work?
Understanding how steel weight is calculated helps in verifying estimates and planning reinforcement quantities more effectively.
Steel weight is calculated using a standard formula based on diameter and length of the bar.
Step 1 — Identify Bar Diameter
Select the diameter of the steel bar (e.g., 8 mm, 10 mm, 12 mm, etc.).
Step 2 — Convert Length to Meters
Ensure that the bar length is in meters. If given in feet or inches, convert it to meters.
Step 3 — Apply Steel Weight Formula
Where:
- D — diameter of the bar (in mm)
- Length — length of the bar (in meters)
Step 4 — Calculate Total Steel Weight
Multiply the weight of a single bar by the total number of bars to get the overall steel requirement.
Step 5 — Add Wastage (Optional)
Wastage is optional and depends on site conditions such as cutting, bending, and handling losses.
This formula is widely used in civil engineering standards such as IS codes and international construction practices.
Worked Example
Input Values Used
| Input | Value |
|---|---|
| Bar Diameter | 12 mm |
| Bar Length | 100 m |
| Quantity | 1 bars |
| Wastage | 0% |
Step 1 — Weight per Meter
| Calculation | Substitution | Result |
|---|---|---|
| Weight per meter | 12² ÷ 162 | 0.889 kg/m |
Step 2 — Weight per Bar and Total Weight
| Calculation | Substitution | Result |
|---|---|---|
| Weight per bar | 0.889 × 100 | 88.889 kg |
| Total weight | 88.889 × 1 | 88.89 kg |
Step 3 — Final Weight (with Wastage)
| Calculation | Substitution | Result |
|---|---|---|
| Wastage weight | 88.89 × 0 ÷ 100 | 0.00 kg |
| Final weight | 88.89 + 0.00 | 88.89 kg |
Therefore, for 1 bar of 12mm diameter at 100 m each, you need approximately 88.89 kg of steel.
Disclaimer: This calculator provides approximate results for planning and estimation purposes only. Actual requirements may vary based on site conditions, materials, workmanship, and local building regulations. Always consult a qualified engineer, architect, or construction professional before making final decisions.