# Tokyo, Japan → Paris, France RTT

🇯🇵 **Tokyo, Japan (TYO)** → 🇫🇷 **Paris, France (PAR)**

Measurement round: `2026-08-16T04:07:28Z`.

For the 2026-08-16T04:07:28Z measurement window, ICMP echo RTT from Tokyo, Japan to Paris, France averaged 204.8 ms, with a minimum of 196.94 ms and a maximum of 227.87 ms. The 50-sample run recorded 0% packet loss, while jitter settled at 5.58 ms.

This long-haul path sits 9,736.1 km apart on the geodesic line, and the measured average is 2.15 times the theoretical fiber floor. The fiber efficiency of 46.6% means the observed round trip carries considerable headroom above the optical-path minimum, with the inflation factor of 2.15 quantifying that gap.

In the outbound route set of 19 paths, Tokyo-Paris is ranked 16th by measured average RTT. Its variation around the average is about 3.2%, just below the 3.28% median seen across the network's outbound routes, so the route shows a stable result despite the higher latency tier.

## Latency Summary

| Metric               | Value                                                      |
| -------------------- | ---------------------------------------------------------- |
| RTT                  | **204.8 ms**                                               |
| Jitter               | **5.58 ms**                                                |
| Packet Loss          | **0%**                                                     |
| Standard Fiber Floor | **95.34 ms**                                               |
| Fiber Efficiency     | **46.6%**                                                  |
| Latency Tier         | Fair                                                       |
| Source Region        | [Asia Pacific](/docs/network/latency/regions/asia-pacific) |
| Destination Region   | [Europe](/docs/network/latency/regions/europe)             |

## Ping Measurement Series

The chart below renders the 50-sample ICMP echo measurement round for this route; an accessible table of every sample is included with the chart.

## Download This Route's Data

This route's measurement round is published as open data (CC BY 4.0) in CSV, JSON, and YAML. See [About This Measurement](#about-this-measurement) for citation guidance.

## Theoretical Fiber Latency

The public physical reference uses the GeoNames city centres for [Tokyo](https://www.geonames.org/1850147) (35.68950, 139.69171) and [Paris](https://www.geonames.org/2988507) (48.85341, 2.34880). It does not disclose either facility address.

| Physical Reference                            | Value          |
| --------------------------------------------- | -------------- |
| WGS-84 geodesic distance                      | **9,736.1 km** |
| Vacuum RTT floor                              | **64.95 ms**   |
| Standard fiber RTT floor ($n_g=1.4679$)       | **95.34 ms**   |
| Low-latency fiber material floor              | **94.96 ms**   |
| Engineering floor (5% path allowance)         | **100.12 ms**  |
| Research 1.33× mapped-fiber reference         | **126.81 ms**  |
| Estimated unamplified path loss               | **2044.6 dB**  |
| Transparent optical spans / inline amplifiers | **128 / 127**  |
| Published RTT inflation over fiber floor      | **2.15×**      |

Attenuation is used to estimate the number of 80 km optical spans; it does not directly slow light. See the full [theoretical fiber latency, GeoNames, attenuation, and amplifier methodology](/docs/network/latency/theoretical-fiber-latency).

## Stability & Trend

The current measurement round (2026-08-16T04:07:28Z) collected 50 ICMP echo samples on this route. Distribution statistics from that round:

| Round Statistic    | Value         |
| ------------------ | ------------- |
| Minimum RTT        | **196.94 ms** |
| Average RTT        | **204.8 ms**  |
| Maximum RTT        | **227.87 ms** |
| Standard deviation | **6.58 ms**   |
| Stdev / average    | **3.2%**      |

## Route Context

* Departure PoP: [Tokyo (TYO)](/docs/network/latency/tyo-tokyo)
* Destination PoP: [Paris (PAR)](/docs/network/latency/par-paris)
* Region overview: [Asia Pacific](/docs/network/latency/regions/asia-pacific) → [Europe](/docs/network/latency/regions/europe)
* Full global matrix: [Backbone Latency Matrix](/docs/network/latency)
* Physical methodology: [Theoretical Fiber Latency](/docs/network/latency/theoretical-fiber-latency)

## Related City-Pair Routes

**Reverse direction**

* [Paris to Tokyo latency and RTT](/docs/network/latency/pairs/par-tyo-rtt) — 204.7 ms

**Fastest routes departing Tokyo (TYO)**

* [Tokyo to Taipei latency and RTT](/docs/network/latency/pairs/tyo-tpe-rtt) — 32.3 ms
* [Tokyo to Hong Kong latency and RTT](/docs/network/latency/pairs/tyo-hkg-rtt) — 44.8 ms
* [Tokyo to Singapore latency and RTT](/docs/network/latency/pairs/tyo-sin-rtt) — 69.4 ms
* [Tokyo to Seattle latency and RTT](/docs/network/latency/pairs/tyo-sea-rtt) — 84.8 ms
* [Tokyo to Los Angeles latency and RTT](/docs/network/latency/pairs/tyo-lax-rtt) — 101.2 ms

**Fastest routes arriving at Paris (PAR)**

* [London to Paris latency and RTT](/docs/network/latency/pairs/lon-par-rtt) — 6.4 ms
* [Amsterdam to Paris latency and RTT](/docs/network/latency/pairs/ams-par-rtt) — 7 ms
* [Frankfurt to Paris latency and RTT](/docs/network/latency/pairs/fra-par-rtt) — 7.6 ms
* [Marseille to Paris latency and RTT](/docs/network/latency/pairs/mrs-par-rtt) — 8.9 ms
* [Berlin to Paris latency and RTT](/docs/network/latency/pairs/ber-par-rtt) — 15.6 ms

**Same corridor (Asia Pacific → Europe)**

* [Hong Kong to Moscow latency and RTT](/docs/network/latency/pairs/hkg-mow-rtt) — 118.2 ms
* [Taipei to Moscow latency and RTT](/docs/network/latency/pairs/tpe-mow-rtt) — 132.7 ms
* [Singapore to Marseille latency and RTT](/docs/network/latency/pairs/sin-mrs-rtt) — 140.6 ms

## About This Measurement

Published RTT reflects best-case backbone path behavior measured with ICMP echo probes between PoPs. End-user latency also depends on local access networks, congestion, routing policy, and traffic engineering. None of these values is an SLA.

The measurement round behind this page is published as open data under **CC BY 4.0** in the [Hats Network latency dataset](/opendata/latency/). Per-pair files are available at `/opendata/latency/latest/pairs/tyo-par.pings.{csv,json,yaml}`. When citing, include the route, the measurement round timestamp, and the dataset version — for example: "Hats Network latency dataset, Tokyo → Paris round 2026-08-16T04:07:28Z, CC BY 4.0".

***

*Data auto-generated on August 16, 2026. Explore the [full interactive latency matrix](/docs/network/latency) or browse more [city-pair routes](/docs/network/latency/pairs).*

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## License and attribution

- **Canonical source:** [View the human-readable HTML page](https://hatsnet.io/docs/network/latency/pairs/tyo-par-rtt).
- **Original documentation:** © Hats Network Inc., licensed under [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).
- **Public latency data:** © Hats Network Inc., licensed under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).
- **Full terms:** [Content and Data License](https://hatsnet.io/docs/legal/content-and-data-license) — includes attribution requirements, third-party material, trademarks, source code and other exclusions.