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Steel / Rebar Calculators
Rebar Calculator (2026) – TMT Weight, Length & Spacing
Expert Guide
Calculate TMT bar weight (kg/tonne), running length, and number of bars by spacing. Standard D²/162.2 density support.
⚡ Quick Answer
Order steel by total weight. For most slabs, expect around 80-100 kg/m³ (approx 5-6 lbs/cft) of concrete. This tool calculates total tonnage based on your exact spacing and diameter requirements. For professional steel procurement and shop drawings, visit pro.nirmansutra.com.
🛠️ How It Works
- •Choose whether to find the weight, total length, or the number of bars needed.
- •For weights, select the bar diameter — uses standard D²/162.2 density.
- •For spacing, enter the total span and your engineer-specified spacing (typically 100mm-200mm).
- •The tool provides precise tonnage and piece counts for site procurement.
📐 Calculation Formula
Unit Weight (kg/m) = Diameter² / 162.2
Total Weight = Unit Weight × Running Length
Number of Bars = (Net Span / Spacing) + 1
📋 Real-Life Example
Example: Weight of 20 bars of 16mm TMT, each 6m long.
1. Unit Weight = 16² / 162.2 = 1.578 kg/m.
2. Weight per bar = 1.578 × 6 = 9.47 kg.
3. Total Weight = 9.47 × 20 = 189.4 kg.
⚠️ Common Mistakes to Avoid
- ✕Ignoring the difference between D²/162.2 (Standard) and D²/162 (Approximate) — over 10 tonnes, this creates a 10kg error.
- ✕Forgetting to double-check the billing unit — some suppliers bill by "Bundle" weight while engineers calculate by "Actual" weight.
- ✕Not adding 2% bend deduction when calculating length for stirrups or bent bars.
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❓ Frequently Asked Questions
The standard engineering formula is D²/162.2 (where D is diameter in mm). This gives you the weight in kg per meter of length.
A standard 12mm TMT bar weighs 0.888 kg per meter. Since a full bar is 12 meters long, one full bar weighs 10.65 kg.
For 10mm (0.617 kg/m), one bundle of 1 tonne contains approximately 135 pieces (each 12m long).
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