5G Throughput Calculator

by Raja Saroj — Exact RB mapping (TS38.104), dropdowns, and PNG/CSV export.

Responsive — desktop, laptop & mobile friendly.

Numerology (μ)

SCS (kHz)

Choose standard channel BW (exact table)

Selecting a standard BW sets the BW input and uses the exact RB mapping from the embedded table.

Bandwidth (MHz)

Or enter RBs (optional)

MCS preset (quick)

Modulation bits

Code rate (0..1)

MIMO layers

OFDM symbols/slot

Overhead fraction

TDD DL fraction

Use exact table?

Auto-calculates on input change (debounced).

Peak (physical) / Effective DL (TDD)

— Gbps

Note: "Physical throughput" shown above includes MIMO and removes protocol/PHY overhead. Steps below show intermediate values.

REs/sec: —

Bits/RE after FEC: —

Before MIMO & overhead: —

After MIMO (before overhead): —

After overhead (physical): —

RBs: — • slots/sec: —

Press Calculate or edit inputs to compute throughput.

Embedded TS38.104 entries (summary)

Selecting a BW from the dropdown uses the exact N_RB value shown in the option label.

SCS (kHz)	Channel BW (MHz)	N_RB

How to interpret results — TDD vs FDD & quick integration notes

This calculator uses physical-layer math: RB → RE → bits (mod × code rate) → MIMO → overhead. That core formula applies for both TDD and FDD. The duplex-specific input is the TDD DL fraction (dl_frac) — the UI multiplies the computed physical-layer throughput by dl_frac to show the effective downlink for TDD.

Quick rules

TDD: Use the DL fraction (e.g. 0.7) to reflect the portion of time used for DL. Effective_DL = physical × dl_frac.
FDD: Downlink is on a separate carrier — there is no time-split. For a simple model set dl_frac = 1. For accurate modelling add a separate DL carrier.
RB sourcing: RBs come from the embedded TS38.104 table when available (exact match). Otherwise the calculator uses a nearest-table or formula estimate. The RB pill shows which method was used.