Evaluate your stencil aperture against IPC-7525 guidelines. Get instant feedback on area ratio, aspect ratio, and solder paste powder selection before you order the stencil.
New to stencil design? Read the short guide covering area ratio, stencil thickness, powder selection, and how to use this calculator.
Standard thicknesses: 0.10, 0.12, 0.15, 0.20 mm. Thicker = more volume for large pads, worse area ratio for small apertures.
Aperture Dimensions
⚠ Enter PCB pad dimensions from your board layout (Gerber/CAD), not from the stencil Gerber. Stencil Gerbers may already include aperture reduction.
mm
mm
mm
Aperture Scale Factor
Always calculate with your smallest critical aperture. Use scale factor to simulate aperture reduction (typical: 80–90% for fine-pitch). If area ratio is already marginal, avoid reduction.
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0%
Enter stencil thickness and aperture dimensions above to calculate.