Calculator Inputs
Plotly Graph
The chart shows cumulative estimated wire weight as tie count increases.
Example Data Table
| Scenario | Wire Diameter | Ties | Base Length / Tie | Twist % | Waste % | Total Length | Total Weight |
|---|---|---|---|---|---|---|---|
| Slab mesh area | 1.2 mm | 1,200 | 28 cm | 12% | 5% | 395.136 m | 3.508 kg |
| Foundation mat | 1.6 mm | 2,400 | 30 cm | 15% | 7% | 885.960 m | 13.983 kg |
| Column starter zone | 1.0 mm | 800 | 24 cm | 10% | 4% | 219.648 m | 1.354 kg |
Formula Used
1) Wire cross-sectional area
Area (mm²) = π × d² ÷ 4
2) Unit weight per meter
Unit Weight (kg/m) = Area (mm²) × Density (kg/m³) × 10-6
3) Effective length per tie
Effective Tie Length = Base Tie Length × (1 + Twist Allowance ÷ 100)
4) Total wire length
Total Length = Total Ties × Effective Tie Length × (1 + Waste ÷ 100)
5) Total wire weight and cost
Weight = Total Length × Unit Weight | Cost = Weight × Cost per kg
How to Use This Calculator
- Select either Direct ties or Rebar grid estimate.
- Choose a material preset, or select custom density if your wire differs.
- Enter the tie count directly, or enter both bar directions and ties per intersection.
- Enter the base tie length and choose the correct unit.
- Enter wire diameter, twist allowance, and site waste percentage.
- Add spool size and cost per kilogram for purchase planning.
- Press Calculate Tie Wire Weight to show the result above the form.
- Review the chart, compare outputs, and export the summary as CSV or PDF.
FAQs
1) What does this tie wire weight calculator estimate?
It estimates total wire length, weight, spool count, and cost from tie quantity, tie length, wire diameter, waste, and density. It helps when ordering wire for slabs, beams, footings, mats, and columns.
2) Why does wire diameter affect weight so much?
Weight changes quickly because wire area depends on diameter squared. Even a small increase in diameter raises unit weight and can noticeably change the total quantity you need to buy.
3) What is the difference between twist allowance and waste?
Twist allowance adds extra length used when closing each tie. Waste covers cutting losses, damaged pieces, handling loss, and site variation. They are different factors, so both may be useful.
4) How many ties per intersection should I use?
One tie per intersection is common for light work, but some reinforcing details need more. Use project drawings, bar fixing practice, and supervisor instructions for the correct tying pattern.
5) Can I use custom material density?
Yes. Steel is typical, but the calculator also supports stainless steel, copper, galvanized wire, and custom density values. That helps when your material grade or wire type changes.
6) Why does the spool count round up?
Spool count rounds up because purchasing and site planning usually require whole spools. Rounding up also provides a safer procurement quantity when the exact remaining stock is unknown.
7) When should I use grid mode?
Use grid mode when you know the number of bars in each direction and the average ties used at each crossing. It converts the rebar layout into an estimated tie count automatically.
8) Does the cost result include taxes and delivery?
No. The calculator multiplies weight by your cost per kilogram only. Freight, taxes, handling fees, and vendor minimums are not included unless you add them separately to your rate.