Documentation sections

ADC Bit Depth to Dynamic Range

POSThttps://rftools.io/api/py/v1/calculate

Slug audio-adc-snr. Calculate the theoretical SNR and dynamic range of an audio ADC from its bit depth, and the improvement from oversampling.

Inputs

Send every one of these in inputs, in the units shown. Most are required: a call without one is refused (400) and costs nothing; one the calculator can do without takes the default shown. An input outside its range is still computed and flagged in the provenance.

Inputs of audio-adc-snr
Name	Unit	Range	Default	Description
bitDepthnumber	bits	1 … 32	24	Bit Depth
oversamplingRationumber	×	at least 1	1	Oversampling Ratio

Outputs

Returned in values, by key. A value that is unbounded or undefined is null.

Outputs of audio-adc-snr
Field	Unit	Description
theoreticalSnr	dB	Theoretical SNR
oversamplingGain	dB	Oversampling Gain
totalSnr	dB	Total SNR
dynamicRangeheadline	dB	Dynamic Range

Calling it

Calculate: one call, the request and response in full, and its errors.
Batch: this calculator with others, or a sweep, in one request.
Solve for a target: the value of one input that brings an output to a target.

curl -X POST https://rftools.io/api/py/v1/calculate \
  -H "X-API-Key: $RFTOOLS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "slug": "audio-adc-snr",
    "inputs": {
      "bitDepth": 24,
      "oversamplingRatio": 1
    }
  }'

import rftools

client = rftools.Client()  # reads RFTOOLS_API_KEY, or the key `rftools login` saved

result = client.calculate("audio-adc-snr", {"bitDepth": 24, "oversamplingRatio": 1})
print(result.values)
print(result.warnings, result.provenance.formula_ref)

const response = await fetch("https://rftools.io/api/py/v1/calculate", {
  method: "POST",
  headers: {
    "X-API-Key": process.env.RFTOOLS_API_KEY,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "slug": "audio-adc-snr",
    "inputs": {
      "bitDepth": 24,
      "oversamplingRatio": 1
    }
  }),
});
console.log(response.status, await response.json());

package main

import (
	"bytes"
	"fmt"
	"io"
	"net/http"
	"os"
)

func main() {
	body := []byte(`{
	  "slug": "audio-adc-snr",
	  "inputs": {
	    "bitDepth": 24,
	    "oversamplingRatio": 1
	  }
	}`)
	req, err := http.NewRequest("POST", "https://rftools.io/api/py/v1/calculate", bytes.NewReader(body))
	if err != nil {
		panic(err)
	}
	req.Header.Set("X-API-Key", os.Getenv("RFTOOLS_API_KEY"))
	req.Header.Set("Content-Type", "application/json")
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	out, _ := io.ReadAll(res.Body)
	fmt.Println(res.Status, string(out))
}

application/json

{
  "slug": "audio-adc-snr",
  "values": {
    "theoreticalSnr": 146.2553105092678,
    "oversamplingGain": 0,
    "totalSnr": 146.2553105092678,
    "dynamicRange": 146.2553105092678
  },
  "warnings": [],
  "errors": [],
  "provenance": {
    "method": "calculator:audio-adc-snr",
    "version": "api@3f2c1a9b04de",
    "formulaRef": null,
    "assumptions": [],
    "validRange": {
      "status": "inside",
      "bounds": {
        "bitDepth": {
          "min": 1,
          "max": 32,
          "unit": "bits"
        },
        "oversamplingRatio": {
          "min": 1,
          "max": null,
          "unit": "×"
        }
      },
      "outside": [],
      "model": null
    },
    "computedAt": "2026-09-24T14:05:11.003Z",
    "inputs": {
      "bitDepth": 24,
      "oversamplingRatio": 1
    },
    "seed": null,
    "elapsedSeconds": 0.003
  }
}

{
  "detail": [
    {
      "type": "float_parsing",
      "loc": [
        "body",
        "inputs",
        "bitDepth"
      ],
      "msg": "Input should be a valid number, unable to parse string as a number",
      "input": "abc"
    }
  ]
}

An input sent as text. Nothing was counted.

{
  "detail": "More than 120 requests in 60 seconds from this address.",
  "errorKind": "rate_limited",
  "limit": 120,
  "windowSeconds": 60,
  "upgradeUrl": "https://rftools.io/pricing/"
}

Too many requests in a minute, with Retry-After.

Same inputs on the calculator pageADC Bit Depth to Dynamic Range, at these values