15 gauge steel thickness calculator
In the Manufacturers Standard Gauge for steel, 15 gauge is 0.0673 in (1.709 mm). The gauge number counts down as the sheet gets thicker.
Where the neutral axis sits, as a fraction of thickness. 0.33 for tight bends, 0.5 for generous ones.
- Thickness in inches
- 0.067 30
- Weight of the sheet
- 26.838
- Weight per square metre
- 13.419 kg/m2
- Weight per square foot
- 1.2467 kg/ft2
- Minimum inside bend radius One thickness is a safe general rule for mild steel; check the alloy.
- 1.709
- Bend allowance
- 3.813
- Bend deduction
- 3.025
- Suggested V-die opening Eight times thickness is the usual air-bending starting point.
- 13.68
Show the working
- Sheet length = 2000
- Sheet width = 1000
- Steel density = 7850
- Bend angle = 90
- K-factor = 0.42
- Thickness = 1.70942 = 1.709 42
- Thickness in inches = 1.709 42 / 25.4 = 0.0673
- area_m2 = 2000 * 1000 / 1e6 = 2
- volume_m3 = 2 * 1.709 42 / 1000 = 0.003 418 84
- Weight of the sheet = 0.003 418 84 * 7850 = 26.8379
- Weight per square metre = 1.709 42 / 1000 * 7850 = 13.4189
- Weight per square foot = 13.4189 * 0.09290304 = 1.246 66
- Minimum inside bend radius = 1.709 42 * 1 = 1.709 42
- Bend allowance = rad(90) * (1.709 42 + 0.42 * 1.709 42) = 3.812 91
- Bend deduction = 2 * (1.709 42 + 1.709 42) * tan(rad(90)/2) - 3.812 91 = 3.024 77
- Suggested V-die opening = 1.709 42 * 8 = 13.6754
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
Scenarios & local history
Compare a saved scenario
Recent calculations
The formula
- weight = length x width x thickness x density
- bend allowance = angle in radians x (inside radius + K x thickness)
- bend deduction = 2 x (inside radius + thickness) x tan(angle/2) - bend allowance
Gauge numbers are not a single standard. Steel, aluminium, stainless and zinc all use different gauge tables for the same number, so always state the material.
The Manufacturers Standard Gauge descends from a weight-per-square-foot table, which is why the thicknesses are not a neat progression.
Frequently asked
How thick is 15 gauge steel?
0.0673 inches, or 1.709 mm, for uncoated sheet steel.
Is a higher gauge number thicker?
No. The gauge number counts down as thickness goes up, so 16 gauge is thicker than 20 gauge.
Where the numbers come from
- Thicknesses are the Manufacturers Standard Gauge for uncoated hot- and cold-rolled sheet steel.