ForHosting KIT · Developer Utilities

eGFR kidney function calculator

Estimated glomerular filtration rate is the standard screening number clinicians and health apps use when they need a quick read on how well the kidneys clear waste from blood.

● BetaFree · in your browser

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

This calculator implements the CKD-EPI 2021 creatinine equation: enter serum creatinine in mg/dL, age in years, and sex, and receive eGFR in mL/min/1.73 m² plus a KDIGO-style GFR category label. The 2021 refit removed the race coefficient present in the earlier 2009 formula — race is not a biological variable and using it to adjust a lab result can under-estimate kidney disease in Black patients, so this tool never asks for it. The math is fully deterministic and runs locally—no models, labs, or network calls—so the same inputs always produce the same result and patient-like values never leave the request path. This is a screening estimate, not a diagnosis: use it for education, triage checklists, research coding, and product prototypes that need a transparent, auditable eGFR step, and always pair the output with clinician judgment before any care decision.

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

Which eGFR equation does this calculator use?

The CKD-EPI 2021 creatinine equation, which does not use race. Results are in mL/min/1.73 m² and rounded to one decimal place.

What units should I use for serum creatinine?

Milligrams per deciliter (mg/dL). If your lab reports µmol/L, divide by 88.4 to convert to mg/dL before calling the tool.

What happened to the race option from CKD-EPI 2009?

It was removed. NIDDK and NKF/ASN recommend the race-free 2021 equation because the earlier race coefficient was not scientifically justified and could delay diagnosis in Black patients. This tool no longer accepts a race input.

What happens if creatinine is zero or negative?

The call fails with invalid_input. Non-positive serum creatinine is rejected because it is not a valid input to the CKD-EPI power terms.

Can I use this result to make a clinical decision?

No. This is a screening estimate for education, prototyping, and research, not medical advice. Diagnosis and treatment decisions need a licensed clinician reviewing the full clinical picture.

How much does the API cost?

The browser widget runs free and locally. The same computation via the API is billed at $0.002 per request from prepaid KIT balance, with no charge on invalid_input failures.

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/health/egfr

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/health/egfr \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"creatinine":1,"age":50,"sex":"female"}'

const res = await fetch("https://api.kit.forhosting.com/health/egfr", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "creatinine": 1,
    "age": 50,
    "sex": "female"
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/health/egfr",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "creatinine": 1,
    "age": 50,
    "sex": "female"
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/health/egfr", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"creatinine":1,"age":50,"sex":"female"}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"creatinine":1,"age":50,"sex":"female"}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/health/egfr", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "creatinine": 1,
  "age": 50,
  "sex": "female"
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "health.egfr",
  "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.

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