How to use it
- Enter the length of one bar in meters
- Enter the bar diameter in millimeters
- Enter the total number of bars
- Read the total weight (kg) and total length (m) displayed
This tool adds up the mass of all steel reinforcement you plan to use, based on the length of each bar, its diameter, and how many you need. Knowing the exact weight helps you order the right amount of steel, avoid costly over‑orders, and keep site logistics on schedule. The calculator multiplies the bar volume (derived from diameter) by the standard steel density of 7,850 kg/m³, then scales the result by the number of bars. The Total weight tells you how many kilograms of steel to procure, while Total length shows the combined meters of bar you’ll cut and bend. For example, 10 bars × 12 m × 16 mm each give ~190 kg and 120 m total length. Use the numbers to compare quotes or verify structural calculations.
Pro tips
- Add a 5‑10% waste allowance to the weight result
- Round the final weight to the nearest whole kilogram for ordering
- Check that diameter units are in millimeters before entering
- Verify the number of bars matches your shop drawing to avoid under‑ordering
Real-life examples
- A concrete contractor needs the exact steel weight to get an accurate quote from the supplier
- A site engineer checks total rebar length to plan bending and cutting schedules
- A DIY homeowner estimates material costs for a small patio retaining wall
Case study
Mike, a small‑business contractor, entered his 8‑meter, 12‑mm bars (15 pieces) and saw the calculator instantly show 140 kg total weight and 120 m length, letting him order precisely the steel he needed and cut his material cost by 12%.