Calculator API — 135+ Online Calculators | YEB

135+ online calculators via REST API. Finance, health, math, construction, physics and more. Evaluate formulas, search calculators, get definitions.

API FAQ

Dapatkan Kunci API Beli Kredit

Try it live

All 135 calculators are available for free on the web app:

Open calculator.yeb.to

✓

135+ calculators
Finance, health, math, construction, physics, chemistry, biology, statistics, and more.

✓

16 categories
Organized by topic for easy discovery and integration.

✓

30 languages
Translated titles, descriptions, and input/output labels.

Endpoint:

99.9 % Waktu Aktif

7ms Respons

20 req/s

0.001 Kredit / permintaan

Calculate


POST https://api.yeb.to/v1/calculator/calculate

Parameter	Tipe	Wajib	Deskripsi
`api_key`	string	ya	Your API key
`calculator_id`	integer	ya	ID of the calculator to evaluate
`inputs`	object	ya	Input values as key-value pairs (e.g. {"length": 10, "width": 5})
`units`	object	opsional	Selected units per input/output (e.g. {"length": "m", "area": "m2"})

Contoh

curl -X POST https://api.yeb.to/v1/calculator/calculate \
  -H "Content-Type: application/json" \
  -d '{
  "api_key": "YOUR_KEY",
  "calculator_id": 1,
  "inputs": {
    "value": 200,
    "percentage": 15
  },
  "units": {}
}'

Contoh Respons

{
  "calculator_id": 1,
  "calculator_slug": "percentage",
  "results": {
    "result": {
      "value": 30,
      "unit": null
    },
    "inverse": {
      "value": 7.5,
      "unit": null
    }
  },
  "credits_spent": 0.001,
  "credits_left": 99.99,
  "response_code": 200,
  "response_time_ms": 12
}

{
  "error": "Calculator not found",
  "response_code": 404,
  "response_time_ms": 3
}

Kode Respons

Kode	Deskripsi
200 Success	Permintaan diproses OK.
400 Bad Request	Validasi input gagal.
401 Unauthorized	Kunci API hilang / salah.
403 Forbidden	Kunci tidak aktif atau tidak diizinkan.
429 Rate Limit	Terlalu banyak permintaan.
500 Server Error	Kegagalan tak terduga.

Calculate

calculator/calculate 0.0010 credits

Method

URL

Authentication

API Key

Parameters

API Key

body · string · required

Calculator ID

body · string · required

Inputs

body · string · required

Units

body · string

Code Samples

Response

Status: —

Headers

Body

List Calculators


POST https://api.yeb.to/v1/calculator/list

Parameter	Tipe	Wajib	Deskripsi
`api_key`	string	ya	Your API key
`category`	string	opsional	Filter by category slug (e.g. "finance", "health", "math")
`locale`	string	opsional	Language code for translated titles (default: en)
`limit`	integer	opsional	Max results, 1–100 (default: 50)
`offset`	integer	opsional	Skip N results for pagination (default: 0)

Contoh

curl -X POST https://api.yeb.to/v1/calculator/list \
  -H "Content-Type: application/json" \
  -d '{
  "api_key": "YOUR_KEY",
  "category": "finance",
  "locale": "en",
  "limit": 5
}'

Contoh Respons

{
  "total": 14,
  "offset": 0,
  "limit": 5,
  "calculators": [
    {
      "id": 1,
      "slug": "percentage",
      "title": "Percentage Calculator",
      "short_description": "Calculate what X% of Y is.",
      "category": "finance"
    },
    {
      "id": 2,
      "slug": "percentage-change",
      "title": "Percentage Change Calculator",
      "short_description": "Calculate percentage change between two values.",
      "category": "finance"
    }
  ],
  "credits_spent": 0,
  "credits_left": 100,
  "response_code": 200,
  "response_time_ms": 8
}

{
  "error": "Invalid limit parameter",
  "response_code": 400,
  "response_time_ms": 2
}

Kode Respons

Kode	Deskripsi
200 Success	Permintaan diproses OK.
400 Bad Request	Validasi input gagal.
401 Unauthorized	Kunci API hilang / salah.
403 Forbidden	Kunci tidak aktif atau tidak diizinkan.
429 Rate Limit	Terlalu banyak permintaan.
500 Server Error	Kegagalan tak terduga.

List Calculators

calculator/list 0.0000 credits

Method

URL

Authentication

API Key

Parameters

API Key

body · string · required

Code Samples

Response

Status: —

Headers

Body

Calculator Info


POST https://api.yeb.to/v1/calculator/info

Parameter	Tipe	Wajib	Deskripsi
`api_key`	string	ya	Your API key
`slug`	string	opsional	Calculator slug (e.g. "bmi", "mortgage")
`calculator_id`	integer	opsional	Calculator ID (alternative to slug)
`locale`	string	opsional	Language code (default: en)

Contoh

curl -X POST https://api.yeb.to/v1/calculator/info \
  -H "Content-Type: application/json" \
  -d '{
  "api_key": "YOUR_KEY",
  "slug": "bmi"
}'

Contoh Respons

{
  "id": 25,
  "slug": "bmi",
  "title": "BMI Calculator",
  "short_description": "Calculate your Body Mass Index.",
  "formula": {
    "inputs": [
      {"key": "weight", "type": "number", "default": 70, "unit_group": "mass", "default_unit": "kg"},
      {"key": "height", "type": "number", "default": 175, "unit_group": "height", "default_unit": "cm"}
    ],
    "outputs": [
      {"key": "bmi", "expression": "weight / (height * height)", "precision": 1},
      {"key": "category", "expression": "..."}
    ],
    "unit_groups": {
      "mass": {"kg": 1, "lb": 0.453592},
      "height": {"m": 1, "cm": 0.01, "in": 0.0254}
    }
  },
  "input_labels": {"weight": "Weight", "height": "Height"},
  "output_labels": {"bmi": "Your BMI", "category": "Category"},
  "category": {"slug": "health", "name": "Health & Fitness"},
  "credits_spent": 0,
  "response_code": 200
}

{
  "error": "Calculator not found",
  "response_code": 404,
  "response_time_ms": 3
}

Kode Respons

Kode	Deskripsi
200 Success	Permintaan diproses OK.
400 Bad Request	Validasi input gagal.
401 Unauthorized	Kunci API hilang / salah.
403 Forbidden	Kunci tidak aktif atau tidak diizinkan.
429 Rate Limit	Terlalu banyak permintaan.
500 Server Error	Kegagalan tak terduga.

Calculator Info

calculator/info 0.0000 credits

Method

URL

Authentication

API Key

Parameters

API Key

body · string · required

Slug

body · string

Calculator ID

body · string

Locale

body · string

Code Samples

Response

Status: —

Headers

Body

Search Calculators


POST https://api.yeb.to/v1/calculator/search

Parameter	Tipe	Wajib	Deskripsi
`api_key`	string	ya	Your API key
`query`	string	ya	Search query (minimum 2 characters)
`locale`	string	opsional	Language code (default: en)
`limit`	integer	opsional	Max results, 1–50 (default: 20)

Contoh

curl -X POST https://api.yeb.to/v1/calculator/search \
  -H "Content-Type: application/json" \
  -d '{
  "api_key": "YOUR_KEY",
  "query": "mortgage",
  "locale": "en",
  "limit": 5
}'

Contoh Respons

{
  "query": "mortgage",
  "results": [
    {
      "id": 5,
      "slug": "mortgage",
      "title": "Mortgage Calculator",
      "short_description": "Calculate monthly mortgage payment, total interest, and total amount paid.",
      "category": "finance"
    },
    {
      "id": 9,
      "slug": "amortization",
      "title": "Amortization Calculator",
      "short_description": "See how each payment splits between principal and interest.",
      "category": "finance"
    }
  ],
  "credits_spent": 0,
  "response_code": 200,
  "response_time_ms": 15
}

{
  "error": "Query must be at least 2 characters",
  "response_code": 400,
  "response_time_ms": 2
}

Kode Respons

Kode	Deskripsi
200 Success	Permintaan diproses OK.
400 Bad Request	Validasi input gagal.
401 Unauthorized	Kunci API hilang / salah.
403 Forbidden	Kunci tidak aktif atau tidak diizinkan.
429 Rate Limit	Terlalu banyak permintaan.
500 Server Error	Kegagalan tak terduga.

Search Calculators

calculator/search 0.0000 credits

Method

URL

Authentication

API Key

Parameters

API Key

body · string · required

Query

body · string · required

Locale

body · string

Limit

body · string

Code Samples

Response

Status: —

Headers

Body

Calculator API — 135+ Online Calculators | YEB — Practical Guide

A hands-on guide to the Calculator API: 135+ online calculators across 16 categories, formula evaluation with unit conversion, multilingual support in 30 languages, and how to integrate it all into your application.

Last updated: 21 Mar 2026, 00:16 API Version: v1 Burst: 20 req/s Latency: 7 ms

#What the Calculator API does

The Calculator API provides 4 endpoints for accessing 135+ online calculators: evaluate formulas with unit conversion, list and search calculators, and get complete formula definitions — all via simple POST requests.

Key advantage: three out of four endpoints are completely free. Only the Calculate endpoint costs credits (0.001 per request). Formula definitions are open, so you can also evaluate client-side if preferred.

#Endpoints at a glance

Endpoint	What it does	Credits
`POST /v1/calculator/calculate`	Evaluate a calculator formula with inputs and unit conversion	0.001
`POST /v1/calculator/list`	List all calculators, optionally filtered by category	FREE
`POST /v1/calculator/info`	Get full formula definition, inputs, outputs, and unit groups	FREE
`POST /v1/calculator/search`	Search calculators by keyword across all categories	FREE

#Available categories

135 calculators are organized into 16 categories:

Category	Slug	Count	Examples
Finance	`finance`	14	Percentage, Mortgage, Compound Interest, ROI, CAGR
Salary & Tax	`salary-tax`	10	Gross/Net, VAT, Tip, Discount, Margin, Retirement
Health & Fitness	`health`	12	BMI, Calories (TDEE), BMR, Body Fat, Protein
Pregnancy	`pregnancy`	5	Due Date, Ovulation, Period, Fertility Window
Math	`math`	10	Fraction, Quadratic Formula, GPA, Logarithm
Conversion	`conversion`	10	Weight, Length, Temperature, Speed, Pressure
Time & Date	`time-date`	7	Age, Days Between Dates, Countdown, Time Zone
Construction	`construction`	9	Concrete, Brick, Tile, Paint, Roofing
Automotive	`automotive`	8	Fuel Cost, Tire Size, Horsepower, 0-100 km/h
Physics	`physics`	8	Free Fall, Force, Kinetic Energy, Projectile Motion
Chemistry	`chemistry`	7	Molar Mass, pH, Dilution, Percent Yield
Biology	`biology`	6	Punnett Square, DNA, Bacteria Growth
Statistics	`statistics`	8	Std Deviation, Confidence Interval, Z-Score
Food & Cooking	`food`	8	Pizza, Coffee, Grams to Cups, Recipe Scaler
Sports	`sports`	7	Calories Burned, Pace, Marathon, VO2 Max
Fun & Viral	`fun`	6	Love Compatibility, Lucky Number, Zodiac

#How the formula system works

Each calculator stores its formula as a JSON definition with inputs, outputs, unit groups, and constants. The formula engine supports arithmetic, ternary expressions, and built-in math functions (sqrt, sin, cos, log, pow, min, max, etc.).

Use the info endpoint to retrieve the complete formula definition for any calculator. You can then evaluate it server-side via the calculate endpoint, or implement client-side evaluation using the same expression language.

Unit conversion is automatic. Define unit groups (e.g. length: m, cm, ft, in) with conversion factors. Inputs are normalized to base units before evaluation, and outputs are converted to the user's selected display unit.

#Multilingual support

All 135 calculators are translated into 30 languages: English, Bulgarian, Spanish, German, French, Italian, Portuguese, Russian, Polish, Dutch, Turkish, Czech, Romanian, Hungarian, Ukrainian, Swedish, Danish, Finnish, Norwegian, Greek, Arabic, Hebrew, Japanese, Korean, Chinese (Simplified & Traditional), Thai, Vietnamese, Indonesian, and Malay.

Use the locale parameter on the list, info, and search endpoints to get translated titles, descriptions, input/output labels, and educational content.

#Common use cases

Embedded calculators — add interactive calculators to your website or app
Education platforms — provide step-by-step calculations for students
Health & fitness apps — BMI, calorie, and body composition calculations
Real estate tools — mortgage, loan, and amortization calculations
Construction estimators — material quantity and cost calculators
Chatbots & AI assistants — answer calculation questions programmatically
Comparison tools — evaluate multiple scenarios with different inputs

#Try it live

All 135 calculators are available for free on calculator.yeb.to. Each calculator has an interactive widget, educational article, FAQ section, and SEO-optimized pages in 30 languages. The web app uses the same formula engine as the API.

Pertanyaan yang Sering Diajukan

135+ calculators across 16 categories: finance (percentage, mortgage, compound interest, ROI), health (BMI, calories, body fat), math (quadratic formula, logarithm), construction (concrete, brick, tile), physics (free fall, kinetic energy), chemistry (molar mass, pH), and more.

The Calculate endpoint costs 0.001 credits per request. List, Info, and Search endpoints are completely free. Sign up to get free credits.

All 135 calculators are translated into 30 languages including English, Spanish, German, French, Bulgarian, Russian, Japanese, Chinese, Arabic, and more. Use the locale parameter to get translated content.

Yes! Use the Info endpoint with a calculator slug to get the complete formula definition including inputs, outputs, expressions, unit groups, and constants. You can evaluate formulas client-side or via the Calculate endpoint.

Each calculator defines unit groups with conversion factors. When you send a units parameter with your Calculate request, inputs are automatically converted to base units before evaluation, and outputs are converted to your selected display units.

Ya. Setiap permintaan, bahkan yang menghasilkan error, mengonsumsi kredit. Kredit Anda terkait dengan jumlah permintaan, terlepas dari keberhasilan atau kegagalan. Jika error jelas disebabkan oleh masalah platform di pihak kami, kami akan memulihkan kredit yang terpengaruh (tanpa pengembalian uang tunai).

Hubungi kami di [email protected]. Kami menganggap umpan balik serius—jika laporan bug atau permintaan fitur Anda bermakna, kami dapat memperbaiki atau meningkatkan API dengan cepat dan memberikan Anda 50 kredit gratis sebagai terima kasih.

Tergantung pada API dan terkadang bahkan pada endpoint. Beberapa endpoint menggunakan data dari sumber eksternal, yang mungkin memiliki batas lebih ketat. Kami juga menerapkan batas untuk mencegah penyalahgunaan dan menjaga stabilitas platform kami. Periksa dokumentasi untuk batas spesifik setiap endpoint.

Kami beroperasi dengan sistem kredit. Kredit adalah unit prabayar yang tidak dapat dikembalikan yang Anda gunakan untuk panggilan API dan alat. Kredit dikonsumsi secara FIFO (yang terlama lebih dulu) dan berlaku selama 12 bulan sejak tanggal pembelian. Dashboard menampilkan setiap tanggal pembelian dan masa berlakunya.

Ya. Semua kredit yang dibeli (termasuk saldo pecahan) berlaku selama 12 bulan sejak pembelian. Kredit yang tidak digunakan kedaluwarsa secara otomatis dan dihapus secara permanen di akhir masa berlaku. Kredit yang kedaluwarsa tidak dapat dipulihkan atau dikonversi menjadi uang tunai atau nilai lainnya. Aturan transisi: kredit yang dibeli sebelum 22 Sep 2025 diperlakukan sebagai dibeli pada 22 Sep 2025 dan kedaluwarsa pada 22 Sep 2026 (kecuali kedaluwarsa lebih awal dinyatakan saat pembelian).

Ya—dalam masa berlakunya. Kredit yang tidak digunakan tetap tersedia dan dialihkan dari bulan ke bulan hingga kedaluwarsa 12 bulan setelah pembelian.

Kredit tidak dapat dikembalikan. Beli hanya yang Anda butuhkan—Anda selalu bisa mengisi ulang nanti. Jika error platform menyebabkan tagihan gagal, kami dapat memulihkan kredit yang terpengaruh setelah penyelidikan. Tidak ada pengembalian uang tunai.

Harga ditetapkan dalam kredit, bukan dolar. Setiap endpoint memiliki biayanya sendiri—lihat lencana "Kredit / permintaan" di atas. Anda akan selalu tahu persis berapa yang Anda keluarkan.

← Kembali ke API

Dapatkan kredit untuk membuka konten dan fitur premium

Tipe Pelanggan

Negara Penagihan

API / Endpoint

Mata Uang

Jumlah permintaan

Calculator API — 135+ Online Calculators | YEB

Try it live

Calculate

Contoh

Contoh Respons

Kode Respons

Calculate

Parameters

Code Samples

Response

List Calculators

Contoh

Contoh Respons

Kode Respons

List Calculators

Parameters

Code Samples

Response

Calculator Info

Contoh

Contoh Respons

Kode Respons

Calculator Info

Parameters

Code Samples

Response

Search Calculators

Contoh

Contoh Respons

Kode Respons

Search Calculators

Parameters

Code Samples

Response

Calculator API — 135+ Online Calculators | YEB — Practical Guide

#What the Calculator API does

#Endpoints at a glance

#Available categories

#How the formula system works

#Multilingual support

#Common use cases

#Try it live

Pertanyaan yang Sering Diajukan

What calculators are available?

How much does it cost?

What languages are supported?

Can I get the formula definition?

How does unit conversion work?

Apakah permintaan dengan error dihitung dan memakan kredit?

Saya menemukan bug atau ingin kustomisasi di API. Apa yang harus dilakukan?

Berapa batas permintaan?

Bagaimana cara kerja pembayaran dan penggunaan?

Apakah kredit kedaluwarsa?

Apakah kredit yang tidak digunakan dialihkan?

Apakah Anda menawarkan pengembalian dana?

Berapa biaya setiap panggilan API?