expiredTattyBear | Staff posted Mar 14, 2025 03:32 PM
Item 1 of 5
Item 1 of 5
expiredTattyBear | Staff posted Mar 14, 2025 03:32 PM
Small Round Magnets Set: 259-pc (7 sizes) or 500-pc (5 sizes)
$9 each
$15
Amazon
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To determine which deal offers better value, we can compare the total volume of the magnets in each set. This will give us a rough estimate of the amount of magnetic material you're getting. Here's the volume of each magnet, calculated as π×r2×h\pi \times r^2 \times h, where rr is the radius and hh is the height:
259-piece Set
100 pcs 3x1mm: π×(1.52)×1×100=706.86 mm3\pi \times (1.5^2) \times 1 \times 100 = 706.86 \, \text{mm}^3
54 pcs 5x1mm: π×(2.52)×1×54=1,062.52 mm3\pi \times (2.5^2) \times 1 \times 54 = 1,062.52 \, \text{mm}^3
40 pcs 6x2mm: π×(32)×2×40=2,261.95 mm3\pi \times (3^2) \times 2 \times 40 = 2,261.95 \, \text{mm}^3
30 pcs 8x2mm: π×(42)×2×30=3,015.93 mm3\pi \times (4^2) \times 2 \times 30 = 3,015.93 \, \text{mm}^3
20 pcs 10x2mm: π×(52)×2×20=3,141.59 mm3\pi \times (5^2) \times 2 \times 20 = 3,141.59 \, \text{mm}^3
10 pcs 12x3mm: π×(62)×3×10=3,393.80 mm3\pi \times (6^2) \times 3 \times 10 = 3,393.80 \, \text{mm}^3
5 pcs 20x2mm: π×(102)×2×5=3,141.59 mm3\pi \times (10^2) \times 2 \times 5 = 3,141.59 \, \text{mm}^3
Total Volume for 259-piece Set:
706.86+1,062.52+2,261.95+3,015.93+3,141.59+3,393.80+3,141.59=16,724.24 mm3706.86 + 1,062.52 + 2,261.95 + 3,015.93 + 3,141.59 + 3,393.80 + 3,141.59 = 16,724.24 \, \text{mm}^3
500-piece Set
100 pcs 8x2mm: π×(42)×2×100=10,053.10 mm3\pi \times (4^2) \times 2 \times 100 = 10,053.10 \, \text{mm}^3
100 pcs 6x2mm: π×(32)×2×100=5,654.87 mm3\pi \times (3^2) \times 2 \times 100 = 5,654.87 \, \text{mm}^3
100 pcs 5x2mm: π×(2.52)×2×100=3,926.99 mm3\pi \times (2.5^2) \times 2 \times 100 = 3,926.99 \, \text{mm}^3
100 pcs 4x2mm: π×(22)×2×100=2,513.27 mm3\pi \times (2^2) \times 2 \times 100 = 2,513.27 \, \text{mm}^3
100 pcs 3x2mm: π×(1.52)×2×100=1,413.72 mm3\pi \times (1.5^2) \times 2 \times 100 = 1,413.72 \, \text{mm}^3
Total Volume for 500-piece Set:
10,053.10+5,654.87+3,926.99+2,513.27+1,413.72=23,561.95 mm310,053.10 + 5,654.87 + 3,926.99 + 2,513.27 + 1,413.72 = 23,561.95 \, \text{mm}^3
Conclusion
The 500-piece set provides a greater total volume of magnetic material (23,561.95 mm³) compared to the 259-piece set (16,724.24 mm³). Thus, the 500-piece set offers a better deal in terms of the amount of magnetic material you're getting.
If you need any further analysis or have other questions, feel free to ask!
58 Comments
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Our community has rated this post as helpful. If you agree, why not thank gary83
I bought a large variety of individual magnets from kjmagnetics.com to test. Obviously, bigger is better. I haven't had the need to order more of any one particular size, but the 3/8" round or 3/8" square by 1/8" are pretty good with a .4mm layer below them.
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I bought a large variety of individual magnets from kjmagnetics.com to test. Obviously, bigger is better. I haven't had the need to order more of any one particular size, but the 3/8" round or 3/8" square by 1/8" are pretty good with a .4mm layer below them.
Just FYI. Good chance you don't care about this, but for some projects I need things to not be attracted to the outer edges. I still use these, but I also treasure the "disposable" christmas light magnets that our business pays for every year when the light hangers install new ones.
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