Base URL

Getting Started

All endpoints are HTTP GET requests. No authentication headers. CORS is enabled on every response — call directly from browser JavaScript.

No API key CORS enabled JSON responses 100 req/min free

https://studycalcshub.com/api.php?format=json&calc=

            Attribution required: All responses include an attribution and link field. Display a visible "Powered by Study Calcs Hub" credit with a dofollow link to studycalcshub.com when showing results to users.
        

Endpoints

Live API Explorer

Click any endpoint to expand it, fill in parameters, and run a real request against our server.

GET ?calc=gpa Cumulative GPA calculator (4.0 / 5.0 / 10.0 scale) ▶

Parameters

Parameter	Type	Example	Required
`grades`	CSV numbers (0–100)	`90,85,78,92`	Required
`credits`	CSV numbers	`3,3,4,3`	Required
`scale`	4.0 \| 5.0 \| 10.0	`4.0`	Optional

Grades (CSV)

Credits (CSV)

Scale

GET ?calc=grade-final Score needed on final exam ▶

Parameters

Parameter	Description	Example	Required
`current`	Current grade %	`72`	Required
`target`	Target final grade %	`80`	Required
`weight`	Final exam weight %	`40`	Required

Current Grade %

Target Grade %

Final Exam Weight %

GET ?calc=cgpa CGPA → Percentage (India, US, Pakistan, UK) ▶

Parameters

Parameter	Values	Example	Required
`cgpa`	Decimal number	`8.5`	Required
`system`	india10 \| india4 \| pakistan \| us \| uk	`india10`	Required

CGPA

System

GET ?calc=attendance Attendance % and classes-to-safe calculator ▶

Total Classes

Attended

Min Required %

GET ?calc=stddev Mean, variance, standard deviation ▶

Data (CSV)

Type

GET ?calc=pct-to-gpa Percentage → GPA conversion ▶

Percentage

Scale

Code Examples

Integration Samples

JavaScript / Fetch

// GPA Calculator — vanilla JS
const params = new URLSearchParams({
  grades:  '90,85,78,92',
  credits: '3,3,4,3',
  scale:   '4.0'
});

const res  = await fetch(`https://studycalcshub.com/api.php?format=json&calc=gpa&${params}`);
const data = await res.json();

if (data.success) {
  console.log(data.result.gpa);     // "3.67"
  console.log(data.result.letter);  // "A-"
  console.log(data.result.status);  // "Dean's List"
}

Python / Requests

import requests

BASE = "https://studycalcshub.com/api.php"

# CGPA → Percentage
r = requests.get(BASE, params={
    "format": "json",
    "calc":   "cgpa",
    "cgpa":   8.5,
    "system": "india10"
})
data = r.json()
print(data["result"]["percentage"])  # "80.75%"
print(data["result"]["formula"])    # "CGPA × 9.5"

PHP / cURL

<?php
// Attendance checker embedded in your own PHP page
$url = 'https://studycalcshub.com/api.php?' . http_build_query([
    'format'   => 'json',
    'calc'     => 'attendance',
    'total'    => 60,
    'attended' => 42,
    'min'      => 75,
]);
$data = json_decode(file_get_contents($url), true);
echo $data['result']['attendance_pct'];   // "70.0%"
echo $data['result']['status'];           // "At Risk"

Sample JSON Response — GPA

{
  "success":     true,
  "calculator":  "gpa",
  "input": {
    "grades":  [90, 85, 78, 92],
    "credits": [3, 3, 4, 3],
    "scale":   4.0
  },
  "result": {
    "gpa":           "3.67",
    "letter":        "A-",
    "percentage":    "91.8%",
    "status":        "Dean's List",
    "total_credits": 13
  },
  "attribution": "studycalcshub.com",
  "link":        "https://studycalcshub.com"
}

FAQ

Common Questions

Is the API really free? ▼

Yes — completely free, no credit card, no signup. Rate limit is 100 requests per minute per IP. Need more? Contact us.

Do I need CORS headers on my site? ▼

No. We return Access-Control-Allow-Origin: * on every response. Call it directly from browser JavaScript.

What attribution is required? ▼

Display a visible "Powered by Study Calcs Hub" text link pointing to studycalcshub.com. A dofollow link is preferred — it supports free access for everyone.

Are responses cached? ▼

Responses include Cache-Control: no-store since all calculations are deterministic. You can safely cache results client-side.

Is student data stored? ▼

No. Parameters are processed in memory and discarded immediately. Nothing is logged or stored. Zero cookies.

Free Calculator API

Getting Started

Live API Explorer

Parameters

Parameters

Parameters

Integration Samples

Common Questions