DIY & materials
Rebar weight Calculator
Calculate circular reinforcing bar weight with explicit lap lengths. This free rebar weight calculator shows the calculation and its assumptions so you can compare your own figures.
Your results
Calculate circular reinforcing bar weight with explicit lap lengths.
Calculated outcomes
- Weight Per Metre Kg
- 0.8878 kg/m
- Total Weight Tonnes
- 0.117 t
Assumptions and estimates
- Method: Mass per metre = π × diameter² ÷ 4 × density. Total length includes entered laps per bar.
- Nominal circular area estimate. Lap and anchorage lengths must come from the structural design; this tool does not specify reinforcement.
Useful next steps
- Use Compare options to test an alternative side by side.
- Copy, print or download a record of this calculation when you need one.
Reports open your email app addressed to s@s1.ie with the public page address only. Your inputs are never added.
How the rebar weight calculation works
Mass per metre = π × diameter² ÷ 4 × density. Total length includes entered laps per bar.
Nominal circular area estimate. Lap and anchorage lengths must come from the structural design; this tool does not specify reinforcement.
Using this calculator
- Enter your own figures in the labelled inputs. Keep the currencies, units and time periods consistent.
- Choose any applicable rate profile, pattern or assumption shown for this tool. Open additional inputs when relevant.
- Review total weight kg and total length m, then read the stated assumptions and eligibility conditions before using the result.
Worked example
This is a static example using illustrative inputs, not facts about you or today’s date. The displayed eligibility selections and assumptions apply only to this example.
See example inputs
- Bar diameter (mm)
- 12
- Net bar length (m)
- 6
- Number of bars
- 20
- Added length per lap (m)
- 0.6
- Laps per bar
- 1
- Steel density (kg/m³)
- 7850
- Total Weight Kg
- 117.19 kg
- Total Length M
- 132 m