feet per second → miles per hour

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

1 feet per second = 0.681818181818 miles per hour. To convert, multiply the number of feet per second by 0.681818181818. The reverse direction is miles per hour → feet per second.

Common feet per second to miles per hour values

feet per second	miles per hour
1 feet per second	0.681818181818 miles per hour
2 feet per second	1.36363636364 miles per hour
5 feet per second	3.40909090909 miles per hour
10 feet per second	6.81818181818 miles per hour
25 feet per second	17.0454545455 miles per hour
100 feet per second	68.1818181818 miles per hour
1000 feet per second	681.818181818 miles per hour

Input

Field	Type	Description
value *	string	Numeric value to convert

Example output

{
  "value": 1,
  "from": "feet-per-second",
  "to": "miles-per-hour",
  "result": 0.681818
}

Try it — see the 402 challenge (free)

curl -i "https://agent402.tools/api/convert/feet-per-second-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/feet-per-second-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-feet-per-second-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/feet-per-second-to-miles-per-hour", { method: "GET", headers: { "X-Pow-Solution": c.token + ":" + n } });

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