About AntennaMath
AntennaMath is a free suite of RF and antenna engineering calculators built for engineers, students, and wireless professionals. Every tool is grounded in established RF theory and runs entirely in your browser — no sign-up, no cost, no data sent anywhere.
Four core calculator categories covering the most common RF and antenna engineering calculations used in professional wireless system design.
EIRP, ERP, received power, and full link budget calculators for end-to-end RF system design.
Free-space path loss, Fresnel zone clearance, and path loss model tools for wireless planning.
Gain, beamwidth, effective aperture, and radiation pattern calculations for antenna engineers.
VSWR, return loss, reflection coefficient, and impedance matching tools for RF circuit design.
AntennaMath was created to close the gap between quick-and-dirty online tools and proper engineering rigour. Every calculator is verified against standard formulas and designed to be transparent about what it's computing.
Accuracy first
Every formula is sourced from established RF engineering standards and peer-reviewed references.
Always free
No paywalls, no registration, no ads interrupting your workflow — just open and calculate.
Runs in your browser
All computation happens client-side; nothing is sent to a server, keeping your design data private.
Paired with learning
Each calculator is accompanied by the underlying formula and an explanation so you understand the result.
Gain & EIRP
Antenna gain, effective isotropic radiated power, and ERP calculations for transmitter characterisation.
Path Loss & Propagation
Free-space path loss, Fresnel zone clearance, and how signals attenuate over distance and through obstacles.
Link Budget Analysis
End-to-end received power estimates accounting for all gains, cable losses, and path loss.
VSWR & Impedance
Voltage standing wave ratio, return loss, and impedance matching concepts for RF circuits.
Trusted by engineers, students, and hobbyists worldwide
Design and verify wireless systems quickly without leaving the browser.
Learn antenna and RF concepts with instant, formula-backed results.
Plan network coverage and capacity with accurate path-loss tools.
Optimise antenna performance and link margins for amateur radio projects.
Calculate reliable link budgets for low-power wireless sensor deployments.
Jump straight into the most-used RF engineering tools on AntennaMath.