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Amateur Radio Toolkit is the best app for ham radio hobbyists. It contains many calculators to help you design radios and antennas for all your projects.

Tools:

Q code - A list of common Q codes

92 Code - A list of common 92 codes

RST code - A list of RST codes

Coordinate calculator - Find your latitude and longitude by entering your maidenhead square.

Grid square calculator - Find your maidenhead square by entering your latitude and longitude

Distance calculator - Find the distance between two Maidenhead squares

Unit converter - Convert between units

Location - Find your location

Dipole antenna - Calculate the optimal lengths of a dipole antenna for a given frequency

Vertical antenna - Calculate the optimal lengths of a vertical antenna for a given frequency

Cubical quad antenna - Calculate the optimal lengths of a cubical quad antenna for a given frequency

Inverted Vee antenna - Calculate the optimal lengths of an inverted vee antenna for a given frequency

Ground plane antenna - Calculate the optimal lengths of a ground plane antenna for a given frequency

J pole antenna - Calculate the optimal lengths of a J pole antenna for a given frequency

VSWR - Convert between VSWR, Refection coefficient, return loss and mismatch loss

Three element Yagi antenna - Calculate the optimal lengths of a three-element Yagi antenna for a given frequency

Seven-element Yagi antenna - Calculate the optimal lengths of a seven element Yagi antenna for a given frequency

Wavelength frequency converter - Convert between wavelength and frequency

Air core inductor - Calculate the inductance or lengths of an air core inductor

Low pass filter - Calculate the units of an RC or RL LPF circuit

High pass filter - Calculate the units of an RC or RL HPF circuit

Ohm's law - Convert between voltage, current, resistance and power by entering two

Reactance - Calculate the reactance of a capacitor or inductor

Decibel calculator - Convert between decibel values or calculate dB by entering the power or voltage

Voltage divider - Calculate the output voltage or resistance of one resistor

Resistor Color codes - Find the resistance of a resistor by entering the colors of the bands

Resistors in parallel - Calculate the resistance of resistors in parallel

Resistors in series - Calculate the resistance of resistors in series

Capacitors in parallel - Calculate the capacitance of capacitors in parallel

Capacitors in series - Calculate the capacitance of capacitors in series

Coaxial cable - Calculate the properties of a coaxial cable

Morse code

CW abbreviations

NATO phonetic alphabet

You can upgrade to the Pro version to remove all ads and get the following features:

Half wave coax balun - Calculate the optimal length of a half wave coax balun for a given frequency

Narrowband balun - Calculate the inductance and capacitance of a narrowband balun

Small magnetic loop - Calculate the optimal lengths of a small magnetic loop for a given frequency

Full wave loop antenna - Calculate the optimal lengths of a full wave loop antenna for a given frequency

ERP and EIRP - Calculate and convert ERP and EIRP

RMS voltage - Calculate the RMS voltage

Pi attenuator - Calculate the values of the resistors by entering the attenuation and impedance

T attenuator - Calculate the values of the resistors by entering the attenuation and impedance

Inductors in series - Calculate the inductance of inductors in series

Inductors in parallel - Calculate the inductance of inductors in parallel

Doppler shift - Calculate the Doppler shift

Tools:

Q code - A list of common Q codes

92 Code - A list of common 92 codes

RST code - A list of RST codes

Coordinate calculator - Find your latitude and longitude by entering your maidenhead square.

Grid square calculator - Find your maidenhead square by entering your latitude and longitude

Distance calculator - Find the distance between two Maidenhead squares

Unit converter - Convert between units

Location - Find your location

Dipole antenna - Calculate the optimal lengths of a dipole antenna for a given frequency

Vertical antenna - Calculate the optimal lengths of a vertical antenna for a given frequency

Cubical quad antenna - Calculate the optimal lengths of a cubical quad antenna for a given frequency

Inverted Vee antenna - Calculate the optimal lengths of an inverted vee antenna for a given frequency

Ground plane antenna - Calculate the optimal lengths of a ground plane antenna for a given frequency

J pole antenna - Calculate the optimal lengths of a J pole antenna for a given frequency

VSWR - Convert between VSWR, Refection coefficient, return loss and mismatch loss

Three element Yagi antenna - Calculate the optimal lengths of a three-element Yagi antenna for a given frequency

Seven-element Yagi antenna - Calculate the optimal lengths of a seven element Yagi antenna for a given frequency

Wavelength frequency converter - Convert between wavelength and frequency

Air core inductor - Calculate the inductance or lengths of an air core inductor

Low pass filter - Calculate the units of an RC or RL LPF circuit

High pass filter - Calculate the units of an RC or RL HPF circuit

Ohm's law - Convert between voltage, current, resistance and power by entering two

Reactance - Calculate the reactance of a capacitor or inductor

Decibel calculator - Convert between decibel values or calculate dB by entering the power or voltage

Voltage divider - Calculate the output voltage or resistance of one resistor

Resistor Color codes - Find the resistance of a resistor by entering the colors of the bands

Resistors in parallel - Calculate the resistance of resistors in parallel

Resistors in series - Calculate the resistance of resistors in series

Capacitors in parallel - Calculate the capacitance of capacitors in parallel

Capacitors in series - Calculate the capacitance of capacitors in series

Coaxial cable - Calculate the properties of a coaxial cable

Morse code

CW abbreviations

NATO phonetic alphabet

You can upgrade to the Pro version to remove all ads and get the following features:

Half wave coax balun - Calculate the optimal length of a half wave coax balun for a given frequency

Narrowband balun - Calculate the inductance and capacitance of a narrowband balun

Small magnetic loop - Calculate the optimal lengths of a small magnetic loop for a given frequency

Full wave loop antenna - Calculate the optimal lengths of a full wave loop antenna for a given frequency

ERP and EIRP - Calculate and convert ERP and EIRP

RMS voltage - Calculate the RMS voltage

Pi attenuator - Calculate the values of the resistors by entering the attenuation and impedance

T attenuator - Calculate the values of the resistors by entering the attenuation and impedance

Inductors in series - Calculate the inductance of inductors in series

Inductors in parallel - Calculate the inductance of inductors in parallel

Doppler shift - Calculate the Doppler shift

Updated on

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.

This app may share these data types with third parties

Location, App activity and 2 others

No data collected

Learn more about how developers declare collection

Data is encrypted in transit

Data can’t be deleted

4.5

2.13K reviews

A Google user

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November 2, 2018

This is a thoughtful collection of tools, however some of them are unfinished. You should be able to enter information on more lines of each formula, to work things backward. For instance, if I have a 28 foot long piece of wire, what frequency will it resonate if I make a loop out of it? The readability strength and tone section logo says readability tone and strength even though that's improper. There are some other little nuisances, but all in all this is a handy set of tools.

46 people found this review helpful

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Jonathan Horner

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May 19, 2023

The free version is good, but the paid version is awesome. It's only a couple dollars for the paid version, and that gets you lots of goodies. One of the best apps in my radio app arsenal. The app needs an update, and hasn't had one since 2018. The coordinates calculator doesn't work properly, at least on Android 12. I love the app, but guys you have to keep up with the OS developers.

9 people found this review helpful

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Robert Thomas (Bob)

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June 4, 2020

At first I was impressed with all the calculations that ART provides, but there is full page pop up adds in the free version, so I bought it to get rid of the pop-ups, the free version has these full page pop up adds that are absolutely annoying 😠😡 plus there are several of the calculators that are blocked preventing a true evaluation, not enough space to say everything I found rong with ART, but I will have to say, the coax calc is in not accurate, and it's not the only one. Not enough space.

111 people found this review helpful

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