✅ Free · No API Key Required

Trust Tool API

Integrate any of our 5,000+ calculators into your website, app, or workflow. No authentication required for public endpoints.

Base URL

https://calculatorgo.vercel.app/api

POST /api/calculate

Calculate any tool result server-side.

Request

POST https://calculatorgo.vercel.app/api/calculate
Content-Type: application/json

{
  "toolId": "bmi",
  "inputs": {
    "weight": 70,
    "height": 175,
    "age": 30,
    "gender": "male"
  }
}

Response

{
  "toolId": "bmi",
  "result": 22.86,
  "breakdown": {
    "category": "Normal Weight",
    "idealWeightMin": "59.0 kg",
    "idealWeightMax": "79.4 kg"
  },
  "computedAt": 1717200000000
}

GET /api/calculate (shareable URLs)

https://calculatorgo.vercel.app/api/calculate?toolId=bmi&weight=70&height=175&gender=male

Embed Widget

Embed any calculator as an iframe on your website.

<!-- Basic embed -->
<iframe
  src="https://calculatorgo.vercel.app/api/embed/bmi-calculator"
  width="100%"
  height="520"
  frameborder="0"
  title="BMI Calculator"
></iframe>

<!-- Dark theme -->
<iframe
  src="https://calculatorgo.vercel.app/api/embed/bmi-calculator?theme=dark"
  width="400"
  height="520"
  frameborder="0"
></iframe>

<!-- Compact mode -->
<iframe
  src="https://calculatorgo.vercel.app/api/embed/mortgage-calculator?compact=1"
  width="100%"
  height="380"
  frameborder="0"
></iframe>

Query Parameters

Parameter	Values	Default	Description
`theme`	`light` \| `dark`	`light`	Color scheme
`locale`	en, vi, es, fr...	`en`	Language
`compact`	`0` \| `1`	`0`	Reduced padding/spacing

Available Tools

Tool ID	Embed URL	API URL
investment	`/api/embed/investment-calculator`	`/api/calculate?toolId=investment`
bmi	`/api/embed/bmi-calculator`	`/api/calculate?toolId=bmi`
dog-size	`/api/embed/dog-size-calculator`	`/api/calculate?toolId=dog-size`
... and 5,000+ more tools

Rate Limits & Usage

Embed views

Unlimited

No rate limit on embeds

API requests

1,000/day

Per IP address

Commercial use

Enterprise plans available

Attribution

When embedding our widgets, please keep the "Powered by Trust Tool" attribution visible. For commercial use or white-label licensing, contact api@calculatorgo.vercel.app