kilometers per hour → miles per hour

Convert kilometers per hour to miles per hour (speed). Pass ?value=N.

1 kilometers per hour = 0.621371192237 miles per hour. To convert, multiply the number of kilometers per hour by 0.621371192237. The reverse direction is miles per hour → kilometers per hour.

Common kilometers per hour to miles per hour values

kilometers per hour	miles per hour
1 kilometers per hour	0.621371192237 miles per hour
2 kilometers per hour	1.24274238447 miles per hour
5 kilometers per hour	3.10685596119 miles per hour
10 kilometers per hour	6.21371192237 miles per hour
25 kilometers per hour	15.5342798059 miles per hour
100 kilometers per hour	62.1371192237 miles per hour
1000 kilometers per hour	621.371192237 miles per hour

Input

Field	Type	Description
value *	string	Numeric value to convert

Example output

{
  "value": 1,
  "from": "kilometers-per-hour",
  "to": "miles-per-hour",
  "result": 0.621371
}

Try it — see the 402 challenge (free)

curl -i "https://agent402.tools/api/convert/kilometers-per-hour-to-miles-per-hour?value=1"

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

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

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/convert/kilometers-per-hour-to-miles-per-hour?value=1");

No wallet? Pay with compute

This is a pure-CPU tool, so an agent without a wallet can pay with proof-of-work instead of USDC: fetch a challenge, solve it (16 leading zero bits), and resend with the X-Pow-Solution header.

import { createHash } from "node:crypto";
const lz = (b) => { let t = 0; for (const x of b) { if (!x) { t += 8; continue; } t += Math.clz32(x) - 24; break; } return t; };
const c = await (await fetch("https://agent402.tools/api/pow/challenge?slug=convert-kilometers-per-hour-to-miles-per-hour")).json();
let n = 0;
while (lz(createHash("sha256").update(c.challenge + ":" + n).digest()) < c.difficulty) n++;
await fetch("https://agent402.tools/api/convert/kilometers-per-hour-to-miles-per-hour", { method: "GET", headers: { "X-Pow-Solution": c.token + ":" + n } });

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