Model wiring delay from resistance, capacitance, and dimensions. See propagation, RC, and total timing results. Plan faster signal paths with practical, exportable calculation insights.
The input area uses three columns on large screens, two on smaller screens, and one on mobile screens.
| Case | Length (mm) | Width (µm) | Thickness (µm) | Height (µm) | Resistivity (Ω·m) | εr | Driver (Ω) | Load (pF) | Model |
|---|---|---|---|---|---|---|---|---|---|
| Baseline copper route | 12.0 | 2.0 | 1.0 | 1.5 | 1.68e-8 | 3.9 | 45 | 0.15 | Elmore |
| Narrower wire | 12.0 | 1.2 | 0.8 | 1.5 | 1.68e-8 | 3.9 | 45 | 0.15 | Distributed RC |
| Heavier load | 12.0 | 2.0 | 1.0 | 1.5 | 1.68e-8 | 3.9 | 60 | 0.35 | Lumped RC |
Resistance increases with longer routing and higher resistivity. It drops when width or thickness increases because the conducting area becomes larger.
This approximates capacitance to a reference plane using geometry and dielectric properties. It works well as a practical first-pass estimate.
Edge fields add extra capacitance not captured by the parallel-plate term. The fringing factor lets you tune the estimate for your process.
The coupling factor increases effective loading when neighboring lines switch or when a guard spacing assumption is not available.
This coefficient is commonly used for a uniformly distributed RC line. It gives a more realistic estimate than treating the line as one lumped element.
Elmore delay is widely used during physical design because it balances speed, simplicity, and interpretability for RC trees and long wires.
The signal wave also needs time to propagate through the dielectric. The calculator combines propagation time with the selected RC model.
It estimates interconnect timing using conductor resistance, dielectric capacitance, driver resistance, receiving load, and propagation speed. It is useful for first-pass design checks and timing sensitivity studies.
Use Elmore delay when you need a practical estimate for routed wires and RC trees. It is more realistic than a fully lumped model while staying simple enough for fast analysis.
Nearby lines increase effective capacitance, especially in dense routing. The coupling factor lets you inflate the loading estimate when exact field-solver data or spacing details are unavailable.
Wider conductors reduce resistance because cross-sectional area rises. They may also change capacitance. In many cases, resistance reduction dominates and total interconnect delay becomes smaller.
It can support rough off-chip estimates, but dedicated transmission-line analysis is better for long traces, impedance control, reflections, and frequency-dependent losses. Use this as an early screening tool.
Use millimeters for length, micrometers for geometry, ohm-meter for resistivity, and picofarads for the receiving load. The calculator internally converts everything into SI units.
The classification compares total delay to input rise time. It helps you see whether routing delay or transition behavior is more dominant for the entered signal conditions.
Yes. The CSV is helpful for spreadsheets, while the PDF is better for snapshots and documentation. Review values and assumptions before including them in final sign-off packages.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.