Repeater Offset Calculator — Ham Radio

Calculate Repeater Offset

Repeater Output Frequency (MHz) — what you listen on

Standard Repeater Offsets by Band

Band	Freq Range	Standard Offset	Typical Direction
6 meters	50–54 MHz	1.0 MHz	+ or − (varies)
2 meters	144–148 MHz	600 kHz (0.600)	+ above 147, − below 147
1.25 meters	222–225 MHz	1.6 MHz	− (transmit lower)
70 cm	420–450 MHz	5.0 MHz	+ (transmit higher)

Always verify on RepeaterBook.com. Some repeaters use non-standard offsets or reverse splits. The output frequency, offset, direction, and CTCSS tone are all listed for every repeater at repeaterbook.com.

Most Common CTCSS Tones for US Repeaters

Tone (Hz)	Common Usage
67.0	Common — check RepeaterBook
88.5	Common in many regions
100.0	Very common nationally
103.5	Common ARRL/club repeaters
107.2	Popular in urban areas
118.8	Widely used
127.3	Common in Midwest/West
136.5	Common
141.3	Common
151.4	Common in some regions
162.2	Common
179.9	Common
192.8	Common

What if I program the wrong offset direction?

Your radio will transmit on the wrong frequency — either too high or too low. The repeater will not respond. If you program + but the repeater needs −, your transmit frequency misses the input by 1.2 MHz on 2 meters (1200 kHz instead of 600 kHz offset total). Always verify the direction on RepeaterBook before programming.
What is a split or cross-band repeater?

A cross-band repeater receives on one band (e.g., 70cm) and retransmits on another (e.g., 2 meters). This is different from same-band offset operation and requires a cross-band capable radio to use. Most beginner repeaters are same-band. Cross-band repeaters are more common in linked systems and emergency installations.