Manufacturer PCB stack-ups
Browse JLCPCB and PCBWay stack-ups, including two-layer planning presets, and use their dimensions in the calculators.
Manufacturer stack-up referenceJLCPCB and PCBWay
Choose a board, check its layers, then apply the values you need. Two-layer presets use an estimated core thickness. Your browser remembers the selected board and signal layer.
If no value is shown, enter the dielectric constant agreed with your PCB manufacturer. These impedance models use a single value for Er.
Layer details
| Layer | Material | Thickness (mm) | Er |
|---|
Includes common two-layer FR-4 presets from 0.4 to 2 mm with 1 or 2 oz copper, 298 PCBWay constructions with 4 to 18 layers, and 36 JLCPCB 1.6 mm constructions with 4 or 6 layers. The JLCPCB multilayer entries use 1 oz outer copper and 0.5 oz inner copper. For other JLCPCB options, see the manufacturer’s calculator. Confirm the construction for your order. The calculations do not include solder mask or manufacturing corrections.
Use your selected board
Your browser remembers the selected board and signal layer. Open a calculator, expand its stack-up reference and choose Apply to calculator to fill the relevant fields. You can then adjust the inputs. Shared links contain the calculation values, so they work independently of the saved board selection.
Check the construction, not just the board thickness
Boards with the same finished thickness can have very different distances between copper layers. PCBWay also lists variants for the amount of copper retained on inner layers. Choose the construction that matches your order and use the dimensions after lamination.
The picker uses adjacent copper layers as the reference planes for impedance estimates. Those layers must actually provide a continuous reference in your design. A mixed dielectric needs a suitable model or an agreed dielectric constant before its geometry can be applied.
Two-layer boards
The two-layer presets cover common FR-4 board thicknesses with 1 or 2 oz copper on each side. They estimate the core thickness by subtracting both copper layers from the nominal board thickness. This excludes solder mask and surface finish. Use the finished copper thickness and core dimensions confirmed by your manufacturer for impedance design.
Board options come from the JLCPCB specifications and PCBWay specifications. The presets use 35 µm per ounce of copper, as described in JLCPCB’s copper weight guide. JLCPCB lists Er 4.5 for two-layer FR-4. For PCBWay, enter the dielectric constant for the laminate in your order.
Multilayer data
JLCPCB dimensions and Er values come from its published stack-up tables. Its calculator guide describes additional process corrections. PCBWay dimensions come from its standard stack-up catalogue.