{"uid":"cap_1inPyHkVi_QrjrBZ1ZkWf","slug":"electrical-calculators-wire-resistance-5058d1f0","name":"Electrical Calculators – Wire Resistance","description":"Wire resistance R = rho L / A for copper or aluminium at a temperature, or correct a known resistance to a new temperature.","url":"https://electrical-calc.x402tookit.com/wire-resistance?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":["material"],"properties":{"awg":{"type":"string","description":"American wire gauge such as 14 or 2/0 (or send sizeMm2)"},"lengthM":{"type":"number","description":"Wire length in metres (with sizeMm2 or awg), for R = rho L / A"},"sizeMm2":{"type":"number","description":"Conductor cross-section in mm2 (or send awg)"},"material":{"type":"string","description":"copper or aluminium"},"temperatureC":{"type":"number","description":"Wire temperature in degrees C for the geometry result (default 20)"},"resistanceOhm":{"type":"number","description":"Known resistance in ohms at fromTemperatureC, to correct to toTemperatureC"},"toTemperatureC":{"type":"number","description":"Temperature in degrees C to correct resistanceOhm to"},"fromTemperatureC":{"type":"number","description":"Temperature in degrees C at which resistanceOhm was measured (default 20)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"source":{"type":["null","string"]},"areaMm2":{"type":["null","number"]},"lengthM":{"type":["null","number"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"material":{"type":["null","string"]},"alphaPerC":{"type":["null","number"]},"conductor":{"type":["null","string"]},"disclaimer":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"temperatureC":{"type":["null","number"]},"resistanceAt20COhm":{"type":["null","number"]},"resistivity20COhmM":{"type":["null","number"]},"resistanceAtTemperatureOhm":{"type":["null","number"]},"resistivityAtTemperatureOhmM":{"type":["null","number"]},"resistanceOhmPerKmAtTemperature":{"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_cWrpS1XlOA64s0xog-jPE","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 wire resistance using R = ρL/A for copper or aluminium at a given temperature, or corrects a known resistance to a new temperature.","exampleAgentPrompt":"What's the resistance of 75 metres of 14 AWG copper wire at 40°C?","exampleUseCases":[{"title":"Cable sizing for residential wiring","prompt":"Calculate the resistance of 30 metres of 2.5mm² copper wire at 25°C — I need to check if voltage drop will be acceptable for a 20A circuit."},{"title":"Temperature correction for field measurement","prompt":"I measured a copper conductor at 0.45 ohms at 15°C. What will its resistance be at 75°C? The material is copper."},{"title":"Aluminium feeder resistance check","prompt":"What's the total resistance of 150 metres of aluminium wire in AWG 2/0 at 60°C? I'm sizing a feeder run for a subpanel."}],"resultDescription":"Returns computed resistance in ohms for the specified geometry and temperature, plus supporting values: conductor cross-section in mm², resistivity at 20°C, temperature coefficient (alpha), a human-readable summary, and a disclaimer. For temperature-correction mode, returns the corrected resistance and the temperatures used.","failureModes":["Missing required 'material' parameter returns validation error","Providing neither 'awg' nor 'sizeMm2' causes missing-geometry error","Invalid AWG string (e.g. non-standard gauge) may return an error or null area","Providing only geometry fields without length returns partial result (no total resistance)","Extreme temperatures outside physical model range may yield unreliable results"],"whenToPreferThis":"Use this endpoint when you need a precise, physics-based wire resistance calculation (R = ρL/A) for copper or aluminium, with correct temperature adjustment via the standard alpha coefficient formula. Prefer it over voltage-drop endpoints when you need the raw resistance value rather than voltage drop, and over general-purpose calculators when you need material-specific resistivity constants and temperature correction in one call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-11-02T18:30:14.871Z","isFirstParty":false,"canonicalSlug":"electrical-calculators-wire-resistance-5058d1f0"}