Inputs
- Working voltage
- Design spacing
- Minimum spacing
- Voltage slope
- Safety factor
FPC / PCB Engineering Calculator
Creepage and Clearance Calculator: PCB Voltage Spacing
Estimate creepage and clearance spacing from working voltage, minimum spacing, voltage slope and safety factor before formal standard review.
How to use the Creepage and Clearance / Voltage Spacing Calculator
Creepage and clearance spacing affects short risk, dielectric withstand testing and safety distance. This calculator uses a user-defined rule for early layout review before formal standard confirmation.
User-rule creepage and clearance spacing
Formula: Recommended spacing = (minimum spacing + voltage / 100 x slope) x safety factor
- Minimum spacing: baseline distance required by your internal rule.
- Slope: additional spacing per 100 V.
- Safety factor: multiplier for margin, contamination or process risk.
- Design spacing: actual conductor-to-conductor spacing on the layout.
Formula Basis
- Formula basis: editable internal-rule model for early clearance planning.
- Reference: IEC 60664-1 defines the insulation-coordination framework used for clearance and creepage decisions in low-voltage equipment. https://webstore.iec.ch/en/publication/59671
- Engineering note: this is not an official IEC, UL or IPC safety-spacing calculator; final clearance and creepage must follow the required product standard.
Example
With 50 V, 0.10 mm minimum, 0.10 mm per 100 V and 1.5x safety factor, recommended spacing is 0.225 mm.
Outputs
- Recommended spacing
- Design margin
- Pass / warning indication
Engineering Notes
- This is not a substitute for IEC, UL, IPC, customer or product-specific safety rules.
- Creepage and clearance may differ depending on pollution degree, material group, coating and environment.
- Use this planner to encode your internal rule or factory guidance before formal review.
Validation Checks
- Trace-to-trace spacing
- Pad-to-pad spacing
- Hi-pot planning
- Customer voltage class
Related Manufacturing Process
- Circuit Layout - Trace width, spacing, bend-zone routing, differential pair spacing
- Electrical Test - Open / short, resistance, voltage drop, impedance coupon
Related Calculators
- PCB Trace Width Current Calculator - Estimate PCB trace width and current capacity from copper thickness and temperature rise.
- PCB Impedance Calculator / Impedance Planner - Early PCB impedance calculator for single-ended and differential routing planning.
- PCB Power / Trace Resistance Calculator - Estimate PCB power loss, voltage drop and conductor resistance from trace geometry and current.
FAQ
Is this an official safety standard calculator?
No. It is a user-rule planner. Final safety spacing should follow the required product standard and customer specification.
Why make the rule editable?
Different products and factories use different spacing rules. Editable parameters make it easy to replace the default with your own formula later.