{"uid":"cap_b57UcCRi-Y9TfvzFK6enq","slug":"network-calc-propagation-delay-calculator-02b83e90","name":"Network Calc Propagation Delay Calculator","description":"Propagation delay (one way and round trip) over fibre, copper or radio for a distance or two coordinates, plus serialization.","url":"https://network-calc.x402tookit.com/propagation-delay?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":[],"properties":{"lat1":{"type":"number","description":"Start latitude (great-circle distance with lat2, lon1, lon2)"},"lat2":{"type":"number","description":"End latitude"},"lon1":{"type":"number","description":"Start longitude"},"lon2":{"type":"number","description":"End longitude"},"medium":{"enum":["fiber","copper","vacuum","air"],"type":"string","description":"fiber (default), copper, vacuum or air"},"linkMbps":{"type":"number","description":"Link speed in Mbps for serialization delay"},"distanceKm":{"type":"number","description":"Cable or path length in km (use this, or the four coordinates)"},"packetBytes":{"type":"number","description":"Packet size in bytes for serialization delay (default 1500)"},"routeFactor":{"type":"number","description":"Real cable length divided by great-circle distance, 1 to 3 (default 1; real routes are often 1.3 to 2)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"medium":{"type":["null","string"]},"pathKm":{"type":["null","number"]},"source":{"type":["null","string"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"linkMbps":{},"oneWayMs":{"type":["null","number"]},"disclaimer":{"type":["null","string"]},"distanceKm":{"type":["null","number"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"packetBytes":{"type":["null","number"]},"roundTripMs":{"type":["null","number"]},"routeFactor":{"type":["null","number"]},"totalOneWayMs":{"type":["null","number"]},"distanceSource":{"type":["null","string"]},"vacuumOneWayMs":{"type":["null","number"]},"refractiveIndex":{"type":["null","number"]},"serializationMs":{},"speedKmPerSecond":{"type":["null","number"]},"microsecondsPerKm":{"type":["null","number"]},"percentOfLightSpeed":{"type":["null","number"]}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_nuZLOY4fHDj1gPD5PIcYA","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates one-way and round-trip propagation delay over fiber, copper, or radio for a given distance or pair of coordinates, plus optional serialization delay.","exampleAgentPrompt":"What's the one-way and round-trip propagation delay for a fiber link between coordinates 40.7128,-74.0060 (New York) and 51.5074,-0.1278 (London), assuming a route factor of 1.4 and a 10 Gbps link with 1500-byte packets?","exampleUseCases":[{"title":"Transatlantic fiber latency estimation","prompt":"Calculate the round-trip propagation delay over fiber between New York (40.7128, -74.0060) and London (51.5074, -0.1278), using a route factor of 1.4 to account for cable routing, on a 10 Gbps link with 1500-byte packets."},{"title":"Data center interconnect planning","prompt":"I'm planning a data center link between two sites 800km apart over fiber. What's the one-way and round-trip delay I should expect, assuming a route factor of 1.3 and a 1 Gbps link with 1500-byte packets?"},{"title":"Copper vs fiber latency comparison","prompt":"How much more latency does copper add versus fiber for a 500km link? Give me the one-way propagation delay for both media at that distance."}],"resultDescription":"Returns one-way and round-trip propagation delays in milliseconds, the effective path length in km, serialization delay if link speed is provided, total combined one-way delay, the medium used, route factor, and a human-readable summary. May also include a disclaimer about theoretical vs real-world values.","failureModes":["Missing both distanceKm and coordinate pairs — returns error requesting one or the other","Invalid medium value outside enum (fiber/copper/vacuum/air) — validation error","Route factor outside 1-3 range — may be rejected or produce unrealistic results","Coordinates out of valid lat/lon range — returns validation error","linkMbps provided without packetBytes may return partial serialization result using default 1500-byte packet"],"whenToPreferThis":"Use this endpoint when you need precise, physics-based propagation delay estimates for network planning, latency budgeting, or SLA validation. Ideal when you have a known cable distance or geographic coordinates and want one-way/RTT figures broken down by transmission medium. Prefer this over generic ping tools or traceroute when you need theoretical minimums or want to model specific media types (fiber vs copper vs radio).","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T13:14:25.401Z","isFirstParty":false,"canonicalSlug":"network-calc-propagation-delay-calculator-02b83e90"}