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5G NR GSCN (SSB Frequency) Calculator

Convert 5G NR GSCN to SSB reference frequency and NR-ARFCN, or convert SSB frequency back to GSCN. The calculator also validates applicable SS raster entries per band, including the Release 17 n79 bandwidth-dependent step size.

Band-Aware Filters

Use the filters to validate whether a GSCN or SSB frequency is allowed inside a selected band. For n79, channel bandwidth below 40 MHz uses the Release 17 step size of 1.

GSCN to SSB Frequency

SSB Frequency to GSCN

Global GSCN formulas follow 3GPP TS 38.104 clause 5.4.3, including the special 3 MHz raster and n100 special entries.

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Calculation Result

Enter a GSCN or SSB frequency and calculate.

GSCN -
SSB Frequency -
Nearest NR-ARFCN -
Global Raster -

Applicable SS Raster Entries

Band FR SSB SCS Pattern Allowed GSCN Bandwidth Condition Match Notes
No result yet.

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All GSCN Reference Entries

Band FR SSB SCS Pattern Allowed GSCN Bandwidth Condition Notes
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Method Notes

  • Global conversion: uses 3GPP TS 38.104 clause 5.4.3.1 formulas for standard raster, 3 MHz raster, and the n100 special GSCN values.
  • Band validation: uses the SS raster entries from TS 38.104 clause 5.4.3.3, including band-specific explicit GSCN lists.
  • Release 17 n79: the calculator distinguishes 8480 - <16> - 8880 for bandwidths >= 40 MHz and 8475 - <1> - 8884 for bandwidths < 40 MHz.
  • n263: the 120 kHz and 480 kHz cases are generated from the formula expressions defined in the spec, not approximated.
  • NR-ARFCN: the output ARFCN is the nearest global NR-ARFCN to the computed SSB frequency.

How to Use This Tool

  1. Choose an optional NR band and channel bandwidth if you want the result validated against a specific operating band.
  2. Keep Raster Mode on Auto unless you specifically want to test the standard raster or the special 3 MHz raster only.
  3. To convert from GSCN, enter the GSCN value in GSCN to SSB Frequency and press Calculate.
  4. To convert from SSB frequency, enter the frequency in MHz in SSB Frequency to GSCN and press Calculate.
  5. Check Calculation Result for the final GSCN, SSB frequency, and nearest NR-ARFCN.
  6. Review Applicable SS Raster Entries to confirm whether the result is allowed for the selected band and bandwidth.