27 gauge steel thickness calculator
In the Manufacturers Standard Gauge for steel, 27 gauge is 0.0164 in (0.417 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
- 0.016 40
- Weight of the sheet
- 6.540
- Weight per square metre
- 3.270 kg/m2
- Weight per square foot
- 0.3038 kg/ft2
- Minimum inside bend radius One thickness is a safe general rule for mild steel; check the alloy.
- 0.417
- Bend allowance
- 0.929
- Bend deduction
- 0.737
- Suggested V-die opening Eight times thickness is the usual air-bending starting point.
- 3.33
Show the working
- Sheet length = 2000
- Sheet width = 1000
- Steel density = 7850
- Bend angle = 90
- K-factor = 0.42
- Thickness = 0.41656 = 0.416 56
- Thickness in inches = 0.416 56 / 25.4 = 0.0164
- area_m2 = 2000 * 1000 / 1e6 = 2
- volume_m3 = 2 * 0.416 56 / 1000 = 0.000 833 12
- Weight of the sheet = 0.000 833 12 * 7850 = 6.539 99
- Weight per square metre = 0.416 56 / 1000 * 7850 = 3.27
- Weight per square foot = 3.27 * 0.09290304 = 0.303 793
- Minimum inside bend radius = 0.416 56 * 1 = 0.416 56
- Bend allowance = rad(90) * (0.416 56 + 0.42 * 0.416 56) = 0.929 15
- Bend deduction = 2 * (0.416 56 + 0.416 56) * tan(rad(90)/2) - 0.929 15 = 0.737 09
- Suggested V-die opening = 0.416 56 * 8 = 3.332 48
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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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 27 gauge steel?
0.0164 inches, or 0.417 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.