A 4×8 sheet of quarter-inch plate is heavy enough that two people feel it on the lift, and the number behind that weight is easy to get wrong. Aluminum density for 6061 runs 2.70 g/cm³, or 0.0975 lb/in³, and that single constant drives every figure below. Get the density right and the arithmetic takes ten seconds; grab the wrong alloy’s number and you’ll be off by several pounds. The chart covers standard sheet sizes, and the calculator section shows the formula so you can run any size you’re actually buying.
The Weight Chart For Common 1/4 Inch Sizes
| Sheet Size | Area | Weight (1/4 inch, 6061) |
|---|---|---|
| 12″ × 12″ (1 ft²) | 1 ft² | 3.51 lb |
| 24″ × 24″ (2 ft²) | 4 ft² | 14.0 lb |
| 24″ × 48″ (2×4) | 8 ft² | 28.1 lb |
| 36″ × 36″ (3×3) | 9 ft² | 31.6 lb |
| 48″ × 96″ (4×8) | 32 ft² | 112.3 lb |
| 48″ × 120″ (4×10) | 40 ft² | 140.4 lb |
| 60″ × 120″ (5×10) | 50 ft² | 175.5 lb |
If you already know the alloy and quantity you want, the tested 1/4 inch aluminum plate picks are worth a look before you commit to a size.
How The Calculator Works (And The Formula Behind It)
Every aluminum weight calculator runs one formula: length × width × thickness × density. You enter the dimensions, the thickness, and the quantity, pick an alloy if the tool supports it, and it returns a weight per piece and a total.
Two things break the math every time:
- Mixed units. Thickness in inches and length in feet won’t cancel out. Convert everything to one system before multiplying.
- Wrong alloy density. 5052, 6082, and 7075 all sit at different densities than 6061. The 3.51 lb/ft² figure is tied specifically to 6061 and shouldn’t be applied to every alloy.
Same thickness, same alloy, different units.
Why Calculated Weight And Actual Weight Differ
Calculator output is theoretical weight, and finished parts often come in lighter or heavier than the number on screen. Tolerances in the mill, surface coatings, cutouts, and fabrication losses all move the real weight off the calculated figure.
The calculators also assume flat rectangular stock. Holes drilled after the fact, bends, and non-rectangular cuts all remove material the formula never knew about. For a rough number to plan a lift or a shipping quote, the calculated figure is fine. For a final weight spec, weigh the finished part.
Aluminum density also shifts slightly with temperature and alloy temper, though the effect is small enough that most shop work ignores it.
Quick Answers On Quarter-Inch Plate Weight
What does 1/4 inch aluminum plate weigh per square foot?
How much does a 4×8 sheet weigh?
Can I use the 3.51 figure for any alloy? No. It’s specific to 6061 aluminum. 5052, 6082, and 7075 have different densities and will return different weights for the same dimensions.