Work out wi fi throughput estimate instantly with clear inputs, formula shown and shareable results.
Advertised Wi-Fi rates are PHY rates for a single ideal link. Real throughput is roughly half, because CSMA/CA contention, preambles, inter-frame spacing and acknowledgements all consume airtime. That half is then shared among every client on the radio, which is why per-client throughput in a busy room is a small fraction of the headline figure.
Wi-Fi throughput
PHY rate ~ per-stream rate x streams x (width / 20); realistic aggregate ~ 0.5 x PHY; per client = aggregate / clients
Airtime is spent on preambles, contention windows, inter-frame spaces and block acknowledgements. Wi-Fi 6 improves this with OFDMA but the overhead does not vanish.
It makes sharing more efficient for many small transmissions by subdividing the channel, so per-client latency improves substantially even though aggregate throughput changes less.