Duct Sheet Metal Weight Calculator
Estimate sheet metal duct weight.
Enter your values
Enter the duct width in in.
Enter the duct height in in.
Enter the duct length in ft.
Choose one of: 30 gauge (~0.32 lb/sq ft), 28 gauge (~0.41 lb/sq ft), 26 gauge (~0.49 lb/sq ft), 24 gauge (~0.66 lb/sq ft).
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Surface area
- 86.7 sq ft
- Estimated weight
- 42.5 lb
- Weight per foot of run
- 2.12 lb/ft
Quick answer
Duct sheet metal weight is the surface area multiplied by the weight per square foot for the chosen gauge of galvanized steel.
Weight = surface area x lb per sq ft (by gauge)
At a glance
| What it does | Estimate sheet metal duct weight. |
|---|---|
| Category | HVAC & Airflow |
| Inputs needed | Duct width, Duct height, Duct length, Sheet gauge |
| Main output | Surface area |
| Formula | Weight = surface area x lb per sq ft (by gauge) |
| Cost | Free — no sign-up, no download |
How to use the Duct Sheet Metal Weight Calculator
- 1Enter the rectangular duct's width and height and total run length.
- 2Pick the sheet metal gauge specified for the job.
- 3The surface area is multiplied by the gauge's weight per square foot to estimate total weight.
Inputs explained
- Duct width(in)
- Enter the duct width in in.
- Duct height(in)
- Enter the duct height in in.
- Duct length(ft)
- Enter the duct length in ft.
- Sheet gauge
- Choose one of: 30 gauge (~0.32 lb/sq ft), 28 gauge (~0.41 lb/sq ft), 26 gauge (~0.49 lb/sq ft), 24 gauge (~0.66 lb/sq ft).
Worked example
Using the values the calculator loads with:
Inputs
- Duct width16 in
- Duct height10 in
- Duct length20 ft
- Sheet gauge26 gauge (~0.49 lb/sq ft)
Results
- Surface area86.7 sq ft
- Estimated weight42.5 lb
- Weight per foot of run2.12 lb/ft
Frequently asked questions
Why does gauge matter for weight?
Thicker (lower number) gauge steel weighs more per square foot but resists dents and vibration better on larger ducts.
Does this include fittings?
No, this is straight duct only — add extra weight for elbows, transitions and reinforcement separately.
What do I need to enter into the Duct Sheet Metal Weight Calculator?
Just 4 values: duct width, duct height, duct length, sheet gauge. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Duct Sheet Metal Weight Calculator work out the answer?
Duct sheet metal weight is the surface area multiplied by the weight per square foot for the chosen gauge of galvanized steel. It applies the formula Weight = surface area x lb per sq ft (by gauge) and shows the working so you can check each step by hand.
Is the Duct Sheet Metal Weight Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.