Reinforced Concrete Calculator
Calculate materials for reinforced concrete with rebar.
The Reinforced Concrete Calculator is a free tool designed for construction professionals and enthusiasts. Calculate materials for reinforced concrete with rebar. Instantly get the required materials broken down by purchase units, with an option to add a wastage allowance so you never run short on site.
Inputs
Result
Result
How to Use This Calculator
- Measure the element dimensions (length, width, height) with a tape and note them in meters.
- Enter the values in the form fields.
- If reinforcement is needed, enter the steel ratio in kg/m³ (typical: 80–150 kg/m³).
- Adjust the wastage allowance (recommended 5–10 %) to cover on-site losses.
- Click 'Calculate' to get concrete volume, cement bags, sand, gravel and steel.
Frequently Asked Questions
For standard concrete (250 kg/m³ mix), you need 5 bags of 50 kg per m³. For structural concrete (300 kg/m³), use 6 bags. This calculator uses the typical dosage for each element type.
On-site losses from spillage, unusable mixes and level corrections always occur. Adding 5–10 % to your final order ensures you don't run short of material.
Mass concrete has no steel reinforcement and is used for low-load foundations. Reinforced concrete includes steel bars that provide tensile strength, making it suitable for slabs, columns and beams.