Reinforcement steel (rebar) is essential in construction, providing tensile strength to concrete structures. Understanding rebar sizes and weight is critical for accurate material estimation, structural design, and cost planning.
This guide provides a complete overview of rebar sizes, weight calculations, and practical selection guidance for UK and international projects.
Quick Summary: Rebar Sizes & Weight
- Common sizes: 6mm to 25mm
- Most used: 10mm, 12mm, 16mm
- Weight formula: D² ÷ 162
- Sold per ton
- Used in slabs, beams, columns, and foundations
What is Rebar?
Rebar (reinforcement steel) is used to strengthen concrete structures by improving tensile performance.
It is commonly used in:
- Foundations
- Columns
- Beams
- Slabs
We supply reinforcement steel (rebar) in a full range of sizes and grades for international construction projects.
Common Rebar Sizes (UK & International)
| Diameter (mm) | Common Use |
|---|---|
| 6 mm | Light reinforcement |
| 8 mm | Slabs |
| 10 mm | Residential construction |
| 12 mm | General structural use |
| 16 mm | Beams & columns |
| 20 mm | Heavy structures |
| 25 mm+ | Infrastructure projects |
Rebar Weight Chart
| Diameter (mm) | Weight (kg/m) |
|---|---|
| 6 mm | 0.222 |
| 8 mm | 0.395 |
| 10 mm | 0.617 |
| 12 mm | 0.888 |
| 16 mm | 1.58 |
| 20 mm | 2.47 |
| 25 mm | 3.85 |
How to Calculate Rebar Weight
Formula:
- Weight (kg/m) = D² ÷ 162
Where:
- D = diameter in mm
For other steel calculations, see our steel coil weight calculator guide.
Which Rebar Size Should You Use?
- 6–8 mm → slabs and light reinforcement
- 10–12 mm → residential construction
- 16–20 mm → beams and columns
- 25 mm+ → heavy infrastructure
UK vs International Rebar Sizes
Rebar sizing differs globally:
- UK & Europe → metric (mm)
- US → imperial (#3, #4, etc.)
- International → EN / ASTM standards
Understanding standards is important — see our steel grades explained guide.
Rebar Applications
Rebar is widely used in:
- Residential construction
- Infrastructure projects
- Industrial buildings
For large projects, planning order size is essential — see our minimum order quantity guide.
Rebar Weight and Pricing
Rebar is sold per ton.
Weight directly impacts total cost — see our steel prices explained guide.
What Buyers Should Check Before Ordering
Before purchasing:
- Diameter and grade
- Quantity required
- Certification
- Delivery logistics
Buyers should always verify steel mill test certificates (EN 10204 3.1).
Speak to CoreMet Steel
CoreMet Steel supplies reinforcement steel for global construction projects.
Contact CoreMet Steel for:
Rebar supply
- Competitive pricing
- Certified materials
- Reliable delivery
Guidance on inspection documents and certification standards is provided by organisations such as the British Standards Institution (BSI), which oversees the adoption of EN standards in the UK.
