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Wi-Fi Throughput Calculator

Networking

PHY Rate (Theoretical Max)

1.06 Gbps

2×80 MHz · Wi-Fi 6/6E

Est. UDP Throughput

666.7 Mbps

Signal factor: 70%

Est. TCP Throughput

566.7 Mbps

Good signal

StandardGenerationPHY RateEst. TCP SpeedBands
802.11bWi-Fi 111.0 Mbps5.9 Mbps

2.4GHz (20 MHz max)

802.11aWi-Fi 254.0 Mbps28.9 Mbps

5GHz (20 MHz max)

802.11gWi-Fi 354.0 Mbps28.9 Mbps

2.4GHz (20 MHz max)

802.11nWi-Fi 4274.4 Mbps146.9 Mbps

2.4GHz / 5GHz (40 MHz max)

802.11acWi-Fi 5643.8 Mbps344.8 Mbps

5GHz

802.11axWi-Fi 6/6E1.06 Gbps566.7 Mbps

2.4GHz / 5GHz / 6GHz

These are engineering estimates. Actual throughput varies with hardware, interference, and environment.

About This Tool

Wi-Fi Throughput Calculator – Estimate Real-World Wireless Speed

Every Wi-Fi router ships with a headline speed — 300 Mbps, 1.2 Gbps, or even 9.6 Gbps — but those numbers are theoretical maximums measured under ideal lab conditions. Real-world speeds depend on the 802.11 standard in use, the channel width configured on the access point, the number of MIMO spatial streams both devices support, and the signal quality at your location. This calculator models all four variables to give you a realistic UDP and TCP throughput estimate.

The 802.11 Standard Family

The IEEE 802.11 family has evolved through several generations, each introducing higher spectral efficiency and broader bandwidth support:

  • 802.11b (Wi-Fi 1) — Limited to 11 Mbps on 2.4 GHz using DSSS/CCK modulation. Largely obsolete but still seen in legacy embedded devices.
  • 802.11a/g (Wi-Fi 2/3) — Introduced OFDM with 64-QAM for a peak rate of 54 Mbps. 802.11a operates on 5 GHz; 802.11g on 2.4 GHz.
  • 802.11n (Wi-Fi 4) — Added MIMO with up to 4 spatial streams and 40 MHz channel bonding, reaching 600 Mbps under ideal conditions. Dual-band: 2.4 GHz and 5 GHz.
  • 802.11ac (Wi-Fi 5) — Exclusively 5 GHz, supporting 256-QAM, MU-MIMO, up to 8 streams, and 160 MHz channels for a theoretical maximum of nearly 7 Gbps.
  • 802.11ax (Wi-Fi 6/6E) — Introduced OFDMA and 1024-QAM, substantially improving efficiency in dense environments. Wi-Fi 6E extends the standard to the 6 GHz band for additional clean spectrum.

Channel Width and Its Impact

Channel width is one of the biggest levers on throughput. Wider channels carry more data subcarriers simultaneously:

  • 20 MHz — Baseline width. Most compatible, least interference risk.
  • 40 MHz — Approximately doubles throughput. Practical on 5 GHz; often congested on 2.4 GHz.
  • 80 MHz — The default for modern 802.11ac/ax routers. Strong throughput gains.
  • 160 MHz — Maximum width; offers the highest speeds but consumes half the 5 GHz band, leaving fewer non-overlapping channels in dense environments.

Wider channels require more clean spectrum. In crowded areas — apartment buildings, offices — using 80 MHz or 160 MHz can increase interference and reduce real-world performance compared to a narrower, less-contested channel.

MIMO Spatial Streams

Multiple-Input Multiple-Output (MIMO) technology transmits separate data streams over independent antenna paths simultaneously. Each spatial stream multiplies the PHY rate: 2 streams ≈ 2× throughput, 4 streams ≈ 4×. However, both the access point and client device must support the same stream count. Most modern smartphones are 2×2 MIMO; many laptops ship with 2×2 or 3×3 antennas; dedicated Wi-Fi 6 APs may reach 8×8.

Signal Quality (RSSI)

Signal strength — measured in dBm — determines which Modulation and Coding Scheme (MCS) index the radio selects. With an excellent signal (around −40 dBm), the radio uses the highest MCS (1024-QAM on Wi-Fi 6), delivering close to peak PHY rate. As signal degrades, the radio steps down through lower MCS rates: 256-QAM → 64-QAM → BPSK, dramatically reducing throughput. A device at the edge of coverage (−75 dBm) may see less than 20% of its theoretical peak.

Why PHY Rate Differs from Application Throughput

The PHY (physical layer) rate is the raw air-link speed. Before data reaches your application, it passes through several overhead layers:

  • MAC overhead — Wi-Fi is half-duplex; the channel access mechanism (CSMA/CA) requires backoff periods and acknowledgments that reduce effective throughput by roughly 10–15%.
  • Protocol stack overhead — IP headers, TCP/UDP framing, and retransmissions (for TCP) add additional overhead, typically consuming another 5–15% of capacity.
  • Retransmissions — In the presence of interference or weak signal, lost packets trigger retransmissions that further reduce usable throughput.

This calculator applies an empirical MAC overhead factor and aprotocol overhead factor on top of the signal-quality adjustment to arrive at realistic UDP and TCP estimates.

Practical Tips for Maximizing Wi-Fi Speed

  • Place access points centrally and at height to minimize signal path length and wall attenuation.
  • Use 5 GHz or 6 GHz instead of 2.4 GHz for devices in close proximity — these bands are less congested and support wider channels.
  • In dense deployments, prefer 80 MHz over 160 MHz to leave clean spectrum for neighboring APs.
  • Upgrade clients to Wi-Fi 6 to leverage OFDMA scheduling, which improves per-device throughput when many devices share the same AP.
  • Run a Wi-Fi scanner (like Wi-Fi Analyzer on Android orWireless Diagnostics on macOS) to pick the least-congested channel before committing to a configuration.

Frequently Asked Questions

Is the Wi-Fi Throughput Calculator free?

Yes, Wi-Fi Throughput Calculator is totally free :)

Can I use the Wi-Fi Throughput Calculator offline?

Yes, you can install the webapp as PWA.

Is it safe to use Wi-Fi Throughput Calculator?

Yes, any data related to Wi-Fi Throughput Calculator only stored in your browser (if storage required). You can simply clear browser cache to clear all the stored data. We do not store any data on server.

How does the Wi-Fi Throughput Calculator work?

Select your Wi-Fi standard (802.11a/b/g/n/ac/ax), channel width, number of spatial streams (MIMO), and signal quality. The tool computes the theoretical PHY-layer data rate and then applies signal-quality and protocol-overhead factors to estimate real-world UDP and TCP throughput.

Why is my actual throughput so much lower than the advertised speed?

Advertised speeds are peak PHY rates measured under ideal lab conditions using the maximum channel width and streams. Real-world performance is reduced by signal attenuation, interference, protocol overhead, half-duplex MAC contention, retransmissions, and client device capability. Expect 40–70% of the theoretical maximum under typical home conditions.

What is the difference between UDP and TCP throughput?

UDP throughput omits connection-establishment and acknowledgment overhead, so it is higher. TCP throughput reflects what a file transfer or web download actually achieves, as TCP adds acknowledgment packets, congestion control, and retransmission logic that consume additional bandwidth.

How many spatial streams should I use?

Spatial streams (MIMO) multiply throughput — 2 streams roughly double it versus a single stream. The actual gain depends on both your router and your client device supporting the same stream count. Many smartphones support 2 streams; most laptops support 2–4; dedicated Wi-Fi 6 APs may support up to 8.

What signal quality (RSSI) should I aim for?

Signal quality above −50 dBm (Excellent) gives near-peak performance. Between −51 and −60 dBm (Good) is the sweet spot for most home deployments. Below −70 dBm (Poor) causes frequent rate adaptation to lower MCS rates, dramatically reducing throughput. A mesh network or additional access point can improve weak-signal areas.

How accurate are these estimates?

The estimates are engineering approximations based on standard PHY rates and empirical overhead factors. Actual throughput depends on your specific hardware, driver quality, channel congestion, and environment. Use these figures for capacity planning and comparison rather than precise benchmarks.