5G NR Numerology Planner
Pick a numerology (μ) or a subcarrier spacing and see the full frame structure — symbol duration, slot duration, slots per frame, CP length and maximum PRB count — as defined by 3GPP TS 38.211 and TS 38.101.
Used to estimate PRB count.
All numerologies at a glance
| μ | SCS | Slot (ms) | Symbol (μs) | Slots/frame | CP | Typical use |
|---|---|---|---|---|---|---|
| 0 | 15 kHz | 1 | 71.35 | 10 | Normal (NCP) | LTE-like, legacy, low-band FR1 (600–900 MHz) |
| 1 | 30 kHz | 0.5 | 35.68 | 20 | Normal (NCP) | Typical FR1 mid-band (n77 / n78 / n41 at 3.5 GHz) |
| 2 | 60 kHz | 0.25 | 17.84 | 40 | Normal or Extended (ECP) | Optional FR1 / FR2 data channels, URLLC |
| 3 | 120 kHz | 0.125 | 8.92 | 80 | Normal (NCP) | FR2 mmWave data (n257, n258, n260, n261) |
| 4 | 240 kHz | 0.0625 | 4.46 | 160 | Normal (NCP) | FR2 SSB only (synchronisation signal block) |
About 5G numerology
5G NR introduced the concept of numerology — indexed by μ ∈ {0, 1, 2, 3, 4} — to allow a single air-interface design to cover everything from 600 MHz low-band rural coverage to 40 GHz mmWave deployments. The subcarrier spacing is SCS = 15 × 2^μ kHz and the slot duration is 1 / 2^μ ms, so every time you double μ the slot halves and you double the number of slots per 10 ms radio frame.
μ=0 (15 kHz) gives you LTE-like timing and is used for FR1 low bands. μ=1 (30 kHz) is the workhorse for mid-band deployments on n77, n78 and n41. μ=2 (60 kHz) is an option for URLLC in FR1 and also appears in FR2. μ=3 (120 kHz) is the default data numerology for FR2 mmWave, and μ=4 (240 kHz) is reserved for the SSB (Synchronization Signal Block) in FR2 where symbols must be short enough to ride through beam-sweeping.
Who uses this planner?
Radio designers use it to decide the right SCS per deployment. Capacity planners use the PRB count at a given channel bandwidth to size throughput. URLLC use-case architects use the slot duration to estimate user-plane latency budgets. Anyone studying for 5G-related certifications (3GPP, TELCOMA, TCCA) needs this table memorised.
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