Магнитный калькулятор

Configuration

Magnet Material

Shape

Grade

🔩 Magnetic Circuit / Yoke

Diameter (D)

Thickness — magnetization axis

Distance from Surface

Length (L)

Width (W)

Height / Thickness — magnetization axis

Distance from Surface

Outer Diameter (OD)

Inner Diameter (ID)

Thickness — magnetization axis

Distance from Surface

⚠ Inner diameter must be less than outer diameter.

Diameter (D)

Distance from Surface

Outer Diameter (D)

Countersunk Hole Dia. (top)

Through-hole Dia. (bottom)

Total Thickness

Distance from Surface

Length (L)

Width (W)

Height / Thickness

Countersunk Hole Dia. (top)

Through-hole Dia. (bottom)

Distance from Surface

Results

🧲

Enter dimensions and click Calculate

None (no yoke): Standard Maxwell Stress Tensor + image method:
F = 2 × B_face² × A / μ₀
where B_face is the on-axis field at the contact face.

With Iron Plate: Yoke adds return path, boosting flux:
F_iron = F_none + (F_pot − F_none) × (T/D)
where F_pot = Br² × A / (2μ₀) is the ideal pot-magnet limit.
Verified: N35 D=50mm T=30mm → None=141.9 lbf ✓, Iron=201.0 lbf ✓ (ref: 140.36 / 202)

Disc field (Camacho & Sosa):
B(x) = (Br/2)×[(L+x)/√(R²+(L+x)²) − x/√(R²+x²)]

Block field:
B(x) = (Br/π)×[arctan(LW/2x√(4x²+L²+W²)) − arctan(LW/2(x+H)√(4(x+H)²+L²+W²))]

NdFeB (Neodymium)

Grade	Br (T)	Br (G)	BHmax (MGOe)	Max °C

Ferrite (Ceramic)

Grade	Br (T)	Br (G)	BHmax (MGOe)

Two Identical Magnets — Repelling Configuration

Material

Shape

Grade

Diameter

Thickness

Gap Between Magnets

Side Length

Thickness

Gap

Diameter

Gap

Repelling force ≈ attraction at that gap × 0.75 (circuit difference correction).

Repelling Force Results

↔️

Enter dimensions and click Calculate

Magnetic Field Along Axis

Material

Shape

Grade

Diameter

Thickness

Distance from surface (x)

Length (L)

Width (W)

Thickness

Distance from surface (x)

Outer Diameter (OD)

Inner Diameter (ID)

Thickness

Distance from surface (x)

Diameter

Distance from surface (x)

Field Results

📡

Enter dimensions and click Calculate

Force vs. Gap Distance

How pull force changes as gap between magnet and steel surface increases.

Material

Shape

Grade

Diameter / Side

Thickness

Pull Force vs Gap

📊

Enter dimensions to see the force vs. gap table.

Magnetic Unit Converter

Flux Density

Tesla (T)

Gauss (G)

mTesla (mT)

μTesla (μT)

Force

Newtons (N)

Pounds (lbf)

kg-force (kgf)

Ounce-force (ozf)

Length

Inches (in)

Millimeters (mm)

Centimeters (cm)

Meters (m)

Flux Density

1 T = 10,000 G
1 mT = 10 G
1 μT = 0.01 G
Earth ≈ 25–65 μT
MRI ≈ 1.5–3 T
Strong NdFeB ≈ 0.3–0.5 T

Force

1 N = 0.2248 lbf
1 lbf = 4.4482 N
1 kgf = 9.8067 N
1 lbf = 16 ozf

Length

1 in = 25.4 mm
1 in = 2.54 cm
1 mm = 0.03937 in

Магнитный калькулятор

Magnet Property Calculator BETA

Flux Density

Force

Length

Flux Density

Force

Length

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