Wire Gauge

{
  "areaMm2": 0.82305,
  "asOf": "2026-10-11T08:33:13.563Z",
  "awg": 18,
  "basis": "solid annealed copper at 20 C (1.7241e-8 ohm metre)",
  "copperResistanceOhmPer1000ft": 6.3849,
  "copperResistanceOhmPerKm": 20.948,
  "degraded": false,
  "diameterInch": 0.040303,
  "diameterMm": 1.0237,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "loopLengthM": 20,
  "loopResistanceOhm": 0.418956,
  "notChecked": [
    "AMPACITY: this service does NOT say how much current a wire can safely carry. That depends on insulation, bundling, ambient temperature, and local electrical codes: use the code tables or a qualified …",
    "aluminium or other conductors (copper only)",
    "…2 more"
  ],
  "note": null,
  "powerLossW": 1.67582,
  "reasons": [
    "Diameter = 0.127 mm x 92^((36 - n) / 39). Lower AWG numbers are thicker wire.",
    "Voltage drop uses the round-trip length (there and back). A common design target is under 3% drop.",
    "…1 more"
  ],
  "source": "computed locally",
  "summary": "AWG 18: 1.024 mm (0.0403 in), 0.823 mm2, 20.95 ohm/km. 10 m out and back at 2 A drops 0.8379 V (6.98% of 12 V), wasting 1.68 W.",
  "verdict": "COMPUTED",
  "voltageDropPct": 6.983,
  "voltageDropV": 0.837911
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://electronics-calc.x402tookit.com/wire-gauge?awg=18&currentA=2&lengthM=10&supplyV=12'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://electronics-calc.x402tookit.com/wire-gauge?awg=18&currentA=2&lengthM=10&supplyV=12' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Felectronics-calc.x402tookit.com%2Fwire-gauge
const res = await pay("https://electronics-calc.x402tookit.com/wire-gauge?awg=18&currentA=2&lengthM=10&supplyV=12");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://electronics-calc.x402tookit.com/wire-gauge?awg=18&currentA=2&lengthM=10&supplyV=12")
    print(res.status_code, res.text)