How to Use Welding Calculator
The Welding Calculator supports the four most common joint types.
- Pick joint type — Fillet, V-groove, J-groove or square groove.
- Pick unit system — Metric (mm / kg / €) or imperial (inch / lb / $).
- Enter joint geometry — Leg length, plate thickness, root gap, bevel angle as required.
- Enter weld length and process — Process determines default deposition efficiency.
- Enter material density, filler cost, labour rate and overhead — Defaults are provided.
- Read the result — Cross-section, volume, weight, material cost, labour cost, total cost.
Formula & Theory — Welding Calculator
The Welding Calculator treats each joint as an extruded prism:
Fillet: A = 0.5 × L²
V-groove: A = t × g + t² × tan(α / 2)
J-groove: A ≈ t × g + 0.5 × r × t
Square: A = t × g
Volume = A × Length
Filler mass = Volume × density / efficiency
Cost = Filler mass × price + Labour × time × (1 + overhead)| Symbol | Meaning |
|---|---|
| L | Fillet leg length |
| t | Plate thickness |
| g | Root gap |
| α | Bevel included angle |
| r | J-groove radius |
| efficiency | Deposition efficiency of the process |
Deposition rate and time
Time = Filler mass / Deposition rate. Typical SMAW deposition rates are 1–2 kg/h; GMAW spray 4–7 kg/h. The Welding Calculator uses your chosen value to estimate arc time.
Use Cases for Welding Calculator
- Quotation — Build defensible quotes for fabrication jobs.
- Production planning — Translate drawings into kilograms of consumables and arc hours.
- Procurement — Order wire, rod or flux in the right volume.
- Process comparison — Compare SMAW versus GMAW cost for the same joint.
- Education — Welding programs use the calculator to teach cost and deposition concepts.
- Inspection — Cross-check weld volume on as-built joints against drawing requirements.
A solid weld plan starts with knowing how much metal is going into the joint. The Welding Calculator makes that number explicit.