Impedance Calculator
Single-ended microstrip / stripline
Estimate single-ended Z0 for isolated microstrip and stripline traces. Confirm the stackup and model limits with your fabricator.
Microstrip Impedance
Calculate microstrip impedance using Hammerstad-Jensen equations. Ideal for surface layer routing where traces run above a ground plane with controlled dielectric height.
Stripline Impedance
Calculate stripline impedance for traces sandwiched between two ground planes. Provides better EMI shielding and consistent impedance for sensitive high-speed signals.
Differential Pairs
Differential impedance results are temporarily unavailable. The previous differential model was not validated against a field solver or a published source, so it has been switched off until it is. Single-ended Z0 below is for an isolated line and is not a differential result.
Impedance Parameters
MOD: IMP_CAL_V1Differential impedance results are temporarily unavailable. The previous differential model was not validated against a field solver or a published source, so it has been switched off until it is. Single-ended Z0 below is for an isolated line and is not a differential result.
Embedded microstrip results are temporarily unavailable while the model is researched and validated.
Impedance Check
Impedance Control Tips
To Increase Impedance
- • Reduce trace width
- • Increase dielectric height
- • Review laminate dielectric constant
To Decrease Impedance
- • Increase trace width
- • Reduce dielectric height
- • Review laminate dielectric constant
Why Impedance Control Matters
Signal Integrity
Impedance mismatches cause signal reflections that degrade eye diagrams and increase bit error rates. Proper impedance control ensures clean signal transmission for high-speed digital interfaces.
EMI/EMC Compliance
Controlled characteristic impedance reduces electromagnetic emissions and improves immunity. Essential for meeting FCC, CE, and other regulatory requirements.
High-Speed Interface Support
Use the interface specification and a validated field solver to review coupled pairs. This calculator estimates isolated-line impedance only.
Stackup Optimization
Use our impedance calculator to optimize your PCB stackup before fabrication. Adjust trace width, dielectric thickness, or copper weight to achieve target impedance.
Design Mode
Specify your target impedance (50Ω, 100Ω, etc.) and automatically calculate the required trace width for your stackup parameters.
Multiple Dielectric Materials
Supports FR-4, Rogers, Isola, Megtron, and custom dielectric constants. Accurate impedance calculation for standard and high-frequency materials.
Impedance Calculator Technical Guide
Characteristic impedance depends on trace geometry, dielectric properties and reference planes.
The available models estimate isolated microstrip and centered stripline impedance. Confirm results with your fabricator and a field solver within the stated model limits.
Differential impedance results are temporarily unavailable. The previous differential model was not validated against a field solver or a published source, so it has been switched off until it is. Single-ended Z0 below is for an isolated line and is not a differential result.
Embedded microstrip results are temporarily unavailable while the model is researched and validated.
Common Impedance Targets
Related Tools
Impedance Control FAQ
Which calculations are available?
Estimate single-ended Z0 for isolated microstrip and stripline traces. Confirm the stackup and model limits with your fabricator.
Are differential results available?
Differential impedance results are temporarily unavailable. The previous differential model was not validated against a field solver or a published source, so it has been switched off until it is. Single-ended Z0 below is for an isolated line and is not a differential result.
Is embedded microstrip available?
Embedded microstrip results are temporarily unavailable while the model is researched and validated.
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Differential impedance reference (numeric results unavailable)
CalculatorReference for differential pair impedance targets and routing rules. Numeric differential calculation is temporarily unavailable while the model is validated; single-ended Z0 is available.
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Complete Your PCB Design Analysis
Our impedance calculator is part of a comprehensive PCB design toolkit. Calculate trace widths for power delivery or analyze via current capacity for layer transitions.