How do I find the NR-ARFCN for a given frequency?

Rearrange the global formula to N_REF = N_REF-Offs + (F_REF − F_REF-Offs) / ΔF_Global. Enter the frequency in MHz and the tool selects the correct range, divides by the right raster (5, 15 or 60 kHz) and rounds to the nearest valid ARFCN.

Which NR band does my frequency fall into?

A frequency can sit inside more than one band (for example 3500 MHz is in both n77 and n78). The tool cross-checks your frequency against the downlink ranges of the common 3GPP bands and lists every band it matches, so you can pick the one your deployment uses.

Why doesn’t my frequency land exactly on an ARFCN?

The NR channel raster is discrete, so an arbitrary frequency rarely falls precisely on a grid point. The result is rounded to the nearest raster step, which means a tiny offset between your input and the exact ARFCN centre frequency is normal.

Frequency to NR-ARFCN Converter

Enter a frequency in MHz to get the corresponding 5G NR-ARFCN on the 3GPP global raster and auto-identify the matching NR band (FR1 and FR2), per 3GPP TS 38.104 §5.4.2.1.

Frequency (MHz)

Valid range: 0 – 100,000 MHz

NR-ARFCN

633,333

Raster Δf_global: 15 kHz

Frequency: 3500 MHz

Matching NR bands (DL)

n77·C-band extended·TDD(FR1)n78·C-band·TDD(FR1)

NR band DL reference

Band	DL (MHz)	Duplex	FR	Description
n1	2110–2170	FDD	FR1	2100 MHz IMT
n3	1805–1880	FDD	FR1	1800 MHz DCS
n5	869–894	FDD	FR1	850 MHz
n7	2620–2690	FDD	FR1	2600 MHz IMT-E
n8	925–960	FDD	FR1	900 MHz E-GSM
n20	791–821	FDD	FR1	800 MHz DD
n28	758–803	FDD	FR1	700 MHz APT
n38	2570–2620	TDD	FR1	2600 MHz TDD
n40	2300–2400	TDD	FR1	2300 MHz TDD
n41	2496–2690	TDD	FR1	2500 MHz BRS/CBRS
n66	2110–2200	FDD	FR1	AWS-3
n71	617–652	FDD	FR1	600 MHz
n77	3300–4200	TDD	FR1	C-band extended
n78	3300–3800	TDD	FR1	C-band
n79	4400–5000	TDD	FR1	4.5 GHz
n257	26500–29500	TDD	FR2	28 GHz mmWave
n258	24250–27500	TDD	FR2	26 GHz mmWave
n260	37000–40000	TDD	FR2	39 GHz mmWave
n261	27500–28350	TDD	FR2	28 GHz US mmWave

About frequency-to-ARFCN conversion

The 5G New Radio air interface addresses every carrier frequency through a single integer — the NR-ARFCN — computed on a piecewise global raster. Below 3 GHz the raster step Δf_global is 5 kHz; between 3 GHz and 24.25 GHz it widens to 15 kHz; above 24.25 GHz, in the FR2 mmWave range, it is 60 kHz. The reference formula is F_REF = F_REF_Offs + Δf_global × (N_REF − N_REF_Offs), with offsets (0, 600000) and (24250.08 MHz, 2016667).

This converter takes a frequency in MHz, snaps it to the nearest raster point, and cross-checks it against the downlink ranges of every common 3GPP NR band so you immediately see which band (or bands — n77 and n78 overlap, n41 and n7 overlap) the frequency belongs to.

Typical users

RF planners validating carrier plans, spectrum analysts mapping unknown emissions to NR bands, drive-test engineers reconciling scanner frequencies with OSS configuration, and protocol engineers decoding ARFCNs from RRC logs.

Related tools

NR-ARFCN Calculator — bidirectional ARFCN ↔ frequency converter.
NR Band Reference — filterable table of 3GPP NR bands.
Frequency to EARFCN — LTE equivalent converter.

How to look up an NR-ARFCN from a frequency

Enter the frequency. Type the carrier frequency in MHz (for example 3500 or 28000).
Convert. The tool maps it to the nearest NR-ARFCN using the correct raster for that range.
Check the band match. Read the matching NR band(s) and the FR1/FR2 designation to confirm the allocation.

Frequently asked questions

How do I find the NR-ARFCN for a given frequency?: Rearrange the global formula to N_REF = N_REF-Offs + (F_REF − F_REF-Offs) / ΔF_Global. Enter the frequency in MHz and the tool selects the correct range, divides by the right raster (5, 15 or 60 kHz) and rounds to the nearest valid ARFCN.
Which NR band does my frequency fall into?: A frequency can sit inside more than one band (for example 3500 MHz is in both n77 and n78). The tool cross-checks your frequency against the downlink ranges of the common 3GPP bands and lists every band it matches, so you can pick the one your deployment uses.
Why doesn’t my frequency land exactly on an ARFCN?: The NR channel raster is discrete, so an arbitrary frequency rarely falls precisely on a grid point. The result is rounded to the nearest raster step, which means a tiny offset between your input and the exact ARFCN centre frequency is normal.

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