RF & Electronics
Calculator Hub

Smith Chart

Free interactive online Smith Chart tool — plot impedance, calculate VSWR, return loss, and reflection coefficient instantly. Real-time updates, load presets, and shareable URLs.

Link Budget

Free RF link budget calculator: enter Tx power, antenna gains, frequency, and distance to get received signal level, link margin, and max range. Covers satellite, terrestrial, and IoT links.

VSWR / Return Loss

Convert between VSWR, return loss, reflection coefficient, and mismatch loss instantly. Get reflected and transmitted power percentages. Free, instant results.

Free-Space Path Loss

Calculate free-space path loss (FSPL) in dB using the Friis equation. Enter frequency and distance for wireless link budget analysis. Free, instant results.

Cascaded NF

Calculate cascaded noise figure and IP3 for multi-stage RF receiver chains using the Friis formula. Optimize LNA and filter ordering. Free, instant results.

Microstrip Impedance

Calculate microstrip impedance using Hammerstad-Jensen equations. Get Z0, effective dielectric constant, and propagation delay for PCB trace design. Free, instant results.

Filter Designer

Design passive Butterworth and Chebyshev LC ladder filters up to order 10. Calculate component values for low-pass, high-pass, and band-pass topologies. Free, instant results.