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Stripline Impedance Calculator

Welcome to our Stripline Impedance Calculator, your dedicated tool for calculating the impedance of stripline configurations on PCBs using specific operational parameters. This precise calculator helps you accurately assess the impedance for various stripline designs.

Click to learn more about the different types of traces.

A stripline consists of a single trace embedded between two parallel ground planes within the substrate. This setup minimizes electromagnetic interference and maintains consistent impedance, improving signal integrity in high-speed applications.

Inputs Required:

  • Trace Thickness (oz/ft², mils, cm, mm, µm, in)
  • Height (mils, cm, mm, µm, in)
  • Width (mils, cm, mm, µm, in)
  • Dielectric Constant

Outputs Provided:

  • Impedance (Ohms)
  • Warnings for Values Exceeding Acceptable Ranges

PCB Design Calculators

Disclaimer: Please note that the results provided by this calculator are for estimation purposes only and should be used as a guide during the design process. We make every effort to ensure the accuracy of this tool, but it is important to verify all calculations through standard design verification processes. We are not liable for any errors in calculations or their consequences in your projects.
Diagram of a microstrip line to reference while using Stripline Impedance Calculator.
Trace Thickness (t)
Height (h)
Trace Width (w)
Dielectric constant (εr)

* The stripline impedance calculator requires careful consideration of the ratio of the trace width ('w') to the height above the ground plane ('h'). The (w/h) ratio should be maintained between 0.1 and 2.0 for this calculator to produce accurate and reliable results. This range is critical for ensuring that the electromagnetic field around the stripline is adequately confined, which is essential for maintaining stable impedance and good signal integrity. Values outside this range may not adhere to standard modeling assumptions used in stripline design, potentially leading to inaccuracies and performance issues.

Stripline transmission lines consist of a conductive trace enclosed entirely within a dielectric substrate, with parallel ground planes on either side. The impedance of a stripline depends on the width of the trace (w), the thickness of the trace (t), the distance to the ground plane (h), and the dielectric constant of the substrate (εr).

The calculator uses a specific formula to accurately estimate the impedance of your stripline:

  1. Logarithmic Function for Impedance Calculation:

    • Z0 = (60 / √(εr)) × log((1.9 × (2 × h + t)) / (0.8 × w + t))
    • This function calculates the impedance by taking into account the effective width of the stripline. The logarithmic part of the formula considers the increased path of electromagnetic waves caused by the trace's width and thickness and the total dielectric height (2h + t), effectively adjusting for both the conductive and dielectric properties influencing signal propagation.
  2. Effective Dielectric Constant:

    • εr
    • This value represents the dielectric constant of the substrate, which is crucial in determining how the electric field interacts with the material, thereby affecting the impedance calculation and the overall signal integrity within the stripline.

While using our Stripline Impedance Calculator, remember that complex PCB designs often require expert guidance. If you need additional support, our team at 911EDA is ready to assist with comprehensive PCB design services and engineering solutionsLeverage our expertise in PCB design and electronic engineering to enhance your project's success. Learn more about our services and how we can help bring your ideas to life by visiting our PCB Design Services and Engineering Services pages.

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