Calculation Results
Enter project data, then select Calculate.
Calculation breakdown
Planning recommendation
Formula used
Cross-sectional area: A = πd² ÷ 4
Wire volume: V = A × L
Wire weight: W = V × ρ
Steel shortcut: Weight (kg) = d² × L ÷ 162.2
Total ties: N = intersections × ties per intersection
Total length: Ltotal = Lbase × (1 + wastage ÷ 100)
Diameter must use consistent units before area calculation. Length is converted into meters for weight estimation. Density remains editable for specialized wire materials.
The steel shortcut assumes approximately 7,850 kilograms per cubic meter. Custom density calculations use the complete geometric formula. This approach improves estimates for different wire grades.
How to use this calculator
- Select the calculation mode matching your available project data.
- Choose SWG, AWG, or enter a custom wire diameter.
- Select the material and verify its density value.
- Enter wire length, tie quantity, or project section information.
- Add wastage, coil size, material price, and labor rate.
- Select Calculate, then review weight, coils, and project costs.
Use measured tie lengths whenever field data is available. Preset lengths provide planning estimates rather than fabrication guarantees. Always confirm purchasing quantities with actual site requirements.
Tie wire gauge reference
| Reference | Approximate diameter | Common planning use |
|---|---|---|
| 16 SWG | 1.626 mm | General rebar tying and heavier work |
| 18 SWG | 1.219 mm | Common general-purpose tying applications |
| 20 SWG | 0.914 mm | Lighter ties and detailed reinforcement |
| 16 AWG | 1.291 mm | Medium wire where AWG is specified |
| 18 AWG | 1.024 mm | Lighter AWG-based tying requirements |
Material density reference
| Material | Typical density | Calculator default |
|---|---|---|
| Annealed steel | Approximately 7,850 kg/m³ | 7,850 kg/m³ |
| Galvanized steel | Approximately 7,850 kg/m³ | 7,850 kg/m³ |
| Stainless steel | Approximately 8,000 kg/m³ | 8,000 kg/m³ |
| Custom material | User supplied | Editable |
Worked example
A project includes 1,000 intersections with one tie each. Each tie uses 300 millimeters of 16 SWG wire. An eight percent wastage allowance is included.
| Item | Example value |
|---|---|
| Wire diameter | 1.626 mm |
| Base length | 300 m |
| Total length with wastage | 324 m |
| Estimated weight | Approximately 5.28 kg |
| 25 kg coils required | 1 coil |
Actual consumption varies with tie style and workmanship. Coil packaging may also change the purchased quantity. Confirm assumptions before final procurement decisions are issued.
Frequently asked questions
What is tie wire?
Tie wire secures reinforcing bars before concrete placement. Annealed steel wire is commonly selected for flexibility. The wire maintains reinforcement positioning during construction activities.
How is tie wire weight calculated?
The calculator finds circular wire area from diameter. It multiplies area by length to obtain volume. Material density then converts that volume into weight.
What is the difference between AWG and SWG?
AWG and SWG use different diameter schedules. Equal gauge numbers can represent different physical diameters. Always select the standard stated by suppliers.
How much wastage should I include?
Many estimates use five to twelve percent wastage. Complex reinforcement layouts may require a larger allowance. Site experience should guide the final selected percentage.
Can I calculate ties from rebar sizes?
Yes, select the rebar-based tie length option. Enter bar diameters, wraps, tails, and allowances. The result remains an estimate requiring field verification.
Why are coil quantities rounded upward?
Suppliers usually sell complete coils or rolls. A fractional requirement still needs another complete package. Upward rounding prevents avoidable material shortages onsite.
Does galvanizing change the wire weight?
Galvanizing can slightly change finished wire mass. Practical estimates often use standard steel density values. Supplier specifications provide better purchasing accuracy when available.
Can the calculator estimate labor cost?
Yes, enter a labor rate for each tie. The calculator multiplies that rate by tie quantity. This estimate excludes productivity changes and site overhead.
What does ties per coil mean?
It estimates how many selected ties one coil supports. Wastage and tie length influence the resulting quantity. Actual output depends strongly on worker tying practices.
Can I use custom materials?
Yes, choose custom material and enter density. The calculator applies the complete volume-based weight formula. Ensure the density value uses kilograms per cubic meter.
Is this suitable for final procurement?
This tool supports planning and preliminary quantity checks. Final orders should use drawings and site measurements. Supplier coil tolerances must also be considered carefully.