ForHosting KIT · Developer Utilities

Retaining wall block calculator

This retaining wall block calculator estimates how many modular blocks and vertical courses you need once you know the wall run length, finished wall height, and the face length and height of each block.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

It keeps every dimension in the same linear unit, divides height by course height and length by block face length, then ceilings both ratios so partial courses and partial end blocks still become whole units you can order. A common check uses a ten-metre run, a one-point-two-metre finished height, and a zero-point-four by zero-point-two metre face, which yields six courses of twenty-five blocks for one hundred fifty pieces rather than a rough pallet guess. The engine is pure deterministic arithmetic with no network calls, no sampling, and no date-dependent shortcuts. Use it free in the browser for DIY garden walls and contractor take-offs, or call the API at $0.002 per successful request when you need reproducible block counts in estimating software, spreadsheets, or CI fixtures.

How to use it

Enter your values in the form above. The tool checks them before calculating and shows the result on the same page.

Check your inputs

Use the labels and units shown next to each field. If something is missing or outside the allowed range, the page points to the field to fix.

Use it again or automate it

Use the browser tool for individual checks and the API when you need the same capability in an automated workflow.

What you can do with it

Get an answer now

Enter one set of values and see the result without building a spreadsheet or script.

Compare scenarios

Change one value at a time and rerun the calculation to understand what affects the result.

Automate repeated work

Use the API when the same calculation needs to run inside your product or workflow.

FAQ

How do I use this capability?

Complete the fields above and run it on this page. The form highlights anything that needs attention.

For developers — API access

Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.

API endpoint

POSThttps://api.kit.forhosting.com/home/retaining-wall-blocks

Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.

Call it from your stack

curl -X POST https://api.kit.forhosting.com/home/retaining-wall-blocks \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"wall_length":10,"wall_height":1.2,"block_length":0.4,"block_height":0.2}'

const res = await fetch("https://api.kit.forhosting.com/home/retaining-wall-blocks", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "wall_length": 10,
    "wall_height": 1.2,
    "block_length": 0.4,
    "block_height": 0.2
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/home/retaining-wall-blocks",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "wall_length": 10,
    "wall_height": 1.2,
    "block_length": 0.4,
    "block_height": 0.2
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/home/retaining-wall-blocks", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"wall_length":10,"wall_height":1.2,"block_length":0.4,"block_height":0.2}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"wall_length":10,"wall_height":1.2,"block_length":0.4,"block_height":0.2}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/home/retaining-wall-blocks", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "wall_length": 10,
  "wall_height": 1.2,
  "block_length": 0.4,
  "block_height": 0.2
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "home.retaining_wall_blocks",
  "status": "queued",
  "_links": {
    "result": "/tasks/tsk_…/result"
  }
}

The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.

Pricing

Per request$0.002

Published price — no tokens, no invented credits. A failed task is never charged.

Limits

max_abs 1000000000

Errors

HTTP	Code	Meaning
`401`	`unauthorized`	Missing or invalid API key.
`402`	`insufficient_balance`	Your balance doesn't cover the task price.
`404`	`unknown_type`	That task type doesn't exist.
`429`	`rate_limited`	Too many requests. Use the webhook instead of polling.

Read the full KIT documentation →

Run — free