5G NR TBS (Transport Block size) Calculator

This Page provides information about 5G NR TBS (Transport Block size) Calculator. Calculator is based on 3GPP 38.214 communication standards and allows you to calculate TBS depends on MCS (Modulation order, code rate), number of used PRB etc. Modulation Order and Code Rate are determined by tables: 38.214 Table and Table (depends on DCI, C-RNTI, MCS indexs).

Approximately TBS can be calculated using the formulas from 3GPP 38.214 chapter, where Ninfo – number of information bits:

TBS Calculator 3GPP 38.214 chapter

Update1: UPDATE to Latest 3GPP Release

Update2: FIX Calculated Throughput (Added Numerology µ parameter)

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Comments 5
  • Nre value seems to ambigous for values, for 12 and 11 ofdm symbols i see N(RE)=720 , when the number of symbols are increased number of RE should be increased accordingly

    • Dear, Abhilash!
      I think it happend, because Calculator use Table Quantized number of REs allocated for PDSCH within a PRB
      from 3GPP 38.214 rel 15.0.0 ( it was deleted in later releases)
      I will fix it soon
      Regards, Oleg

    • Dear, Abhilash!

      Fixed! Please Check!
      Regards, Oleg

  • If I use 30 KHz sub carrier spacing for 100 MHz BW ( 273 PRBs), I can schedule all 273 PRBs in 0.5 ms slot.

    So for this perspective, the max throughput should be twice the TBS. Please share your view.

    • Dear, Manoj!
      You are right. Max throughput should be twice the TBS.
      (if Numerology =2, 30 KHz)
      Fixed it! I added Numerology µ parameter
      Regards, Oleg

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