For the complete documentation index, see llms.txt.
Size an A/B test from baseline rate, minimum detectable effect, significance, and power.
One POST adds A/B Test Sample Size Calculator to your app, site, workflow, or agent — formula, validation, edge cases, and docs already handled.
prefer a UI? Open the A/B Test Sample Size Calculator on miniwebtool.com →
POST https://api.miniwebtool.com/v1/tools/a-b-test-sample-size-calculator/run
| Field | Type | Req. |
|---|---|---|
baseline_rate_pct
current conversion rate in percent
|
float |
— |
mde_value
minimum detectable effect
|
float |
— |
mde_mode
relative | absolute
|
str |
— |
alpha_pct
5 | 1 | 10
|
str |
— |
power_pct
80 | 85 | 90 | 95
|
str |
— |
test_type
two_tailed | one_tailed
|
str |
— |
num_variants
total arms including control
|
int |
— |
daily_visitors
optional traffic per day for a duration estimate
|
float |
— |
allocation_pct
share of traffic entering the test
|
float |
— |
65536 bytes.hash_only{
"request_id": "01K...",
"tool": "a-b-test-sample-size-calculator",
"tool_version": "2026-04-22",
"credits_used": 1,
"result": { ... }
}
1,000 free calls/mo · no card · key arrives by email
curl -X POST https://api.miniwebtool.com/v1/tools/a-b-test-sample-size-calculator/run \
-H 'Authorization: Bearer mwt_live_YOUR_KEY' \
-H 'Content-Type: application/json' \
-d '{"baseline_rate_pct":5,"mde_value":10,"mde_mode":"relative","alpha_pct":"5","power_pct":"80","test_type":"two_tailed","num_variants":2,"daily_visitors":2000,"allocation_pct":100}'
import requests
resp = requests.post(
'https://api.miniwebtool.com/v1/tools/a-b-test-sample-size-calculator/run',
headers={'Authorization': 'Bearer mwt_live_YOUR_KEY'},
json={'baseline_rate_pct': 5, 'mde_value': 10, 'mde_mode': 'relative', 'alpha_pct': '5', 'power_pct': '80', 'test_type': 'two_tailed', 'num_variants': 2, 'daily_visitors': 2000, 'allocation_pct': 100},
)
resp.raise_for_status()
data = resp.json()
print(data)
const resp = await fetch(
'https://api.miniwebtool.com/v1/tools/a-b-test-sample-size-calculator/run',
{
method: 'POST',
headers: {
'Authorization': 'Bearer mwt_live_YOUR_KEY',
'Content-Type': 'application/json',
},
body: JSON.stringify({"baseline_rate_pct":5,"mde_value":10,"mde_mode":"relative","alpha_pct":"5","power_pct":"80","test_type":"two_tailed","num_variants":2,"daily_visitors":2000,"allocation_pct":100}),
}
);
const data = await resp.json();
console.log(data);
<?php
$ch = curl_init('https://api.miniwebtool.com/v1/tools/a-b-test-sample-size-calculator/run');
curl_setopt_array($ch, [
CURLOPT_POST => true,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_HTTPHEADER => [
'Authorization: Bearer mwt_live_YOUR_KEY',
'Content-Type: application/json',
],
CURLOPT_POSTFIELDS => json_encode([
'baseline_rate_pct' => 5,
'mde_value' => 10,
'mde_mode' => 'relative',
'alpha_pct' => '5',
'power_pct' => '80',
'test_type' => 'two_tailed',
'num_variants' => 2,
'daily_visitors' => 2000,
'allocation_pct' => 100
]),
]);
$resp = curl_exec($ch);
curl_close($ch);
print_r(json_decode($resp, true));
require 'net/http'
require 'json'
require 'uri'
uri = URI('https://api.miniwebtool.com/v1/tools/a-b-test-sample-size-calculator/run')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = (uri.scheme == 'https')
req = Net::HTTP::Post.new(uri)
req['Authorization'] = 'Bearer mwt_live_YOUR_KEY'
req['Content-Type'] = 'application/json'
req.body = {
'baseline_rate_pct' => 5,
'mde_value' => 10,
'mde_mode' => 'relative',
'alpha_pct' => '5',
'power_pct' => '80',
'test_type' => 'two_tailed',
'num_variants' => 2,
'daily_visitors' => 2000,
'allocation_pct' => 100
}.to_json
resp = http.request(req)
puts JSON.parse(resp.body).inspect
package main
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
)
func main() {
body, _ := json.Marshal(map[string]interface{}{
"baseline_rate_pct": 5,
"mde_value": 10,
"mde_mode": "relative",
"alpha_pct": "5",
"power_pct": "80",
"test_type": "two_tailed",
"num_variants": 2,
"daily_visitors": 2000,
"allocation_pct": 100,
})
req, _ := http.NewRequest("POST", "https://api.miniwebtool.com/v1/tools/a-b-test-sample-size-calculator/run", bytes.NewReader(body))
req.Header.Set("Authorization", "Bearer mwt_live_YOUR_KEY")
req.Header.Set("Content-Type", "application/json")
resp, err := http.DefaultClient.Do(req)
if err != nil { panic(err) }
defer resp.Body.Close()
out, _ := io.ReadAll(resp.Body)
fmt.Println(string(out))
}
import java.net.URI;
import java.net.http.*;
var client = HttpClient.newHttpClient();
var req = HttpRequest.newBuilder()
.uri(URI.create("https://api.miniwebtool.com/v1/tools/a-b-test-sample-size-calculator/run"))
.header("Authorization", "Bearer mwt_live_YOUR_KEY")
.header("Content-Type", "application/json")
.POST(HttpRequest.BodyPublishers.ofString("{\"baseline_rate_pct\":5,\"mde_value\":10,\"mde_mode\":\"relative\",\"alpha_pct\":\"5\",\"power_pct\":\"80\",\"test_type\":\"two_tailed\",\"num_variants\":2,\"daily_visitors\":2000,\"allocation_pct\":100}"))
.build();
var resp = client.send(req, HttpResponse.BodyHandlers.ofString());
System.out.println(resp.body());
https://api.miniwebtool.com/v1/tools/a-b-test-sample-size-calculator/run
Authorization: Bearer <key> and Content-Type: application/json. Copy-paste snippets in 7 languages are under Code examples.
{request_id, tool, tool_version, credits_used, result}. The typed output lives in result.
Size an A/B test from baseline rate, minimum detectable effect, significance, and power. Use it to add this utility without rebuilding formulas, validation, examples, and documentation.
1 credit per successful call. Failed calls (validation errors, 5xx) don't bill.
Required fields: (none). Full schema at /v1/openapi.json.
Yes — same input, same output, forever. Tool version 2026-04-22; output shape is stable within a major version.
Yes. Connect to https://api.miniwebtool.com/v1/mcp over the Model Context Protocol. The agent discovers `a-b-test-sample-size-calculator` with its JSON Schema automatically, so the model can plan while MiniWebtool handles the exact tool result.
JSON with a stable envelope: `{request_id, tool, tool_version, credits_used, result}`. Errors are RFC 7807 `application/problem+json`.
Every endpoint on this site is also exposed via the
Model Context Protocol at
https://api.miniwebtool.com/v1/mcp.
Claude, Cursor, and any MCP-capable agent can discover this tool
(a-b-test-sample-size-calculator)
and its JSON Schema automatically — no client codegen.
# List tools the agent can call
curl -s https://api.miniwebtool.com/v1/mcp \
-H 'Content-Type: application/json' \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' \
| jq '.result.tools[] | select(.name=="a-b-test-sample-size-calculator")'