Audio API cost estimator
Whisper Audio Transcription Cost Estimator
Estimate transcription API cost from audio length, files per day, active users, provider rates, and a configurable safety buffer.
Transcription cost estimate
OpenAI · GPT-4o mini Transcribe
$0.099
33 billable minutes
990
30 files per day
$2.97
$89.10
30-day projection
$1,084.05
365-day projection
Calculation basis
- Base minutes per file
- 30
- Billable minutes after buffer
- 33
- Billing increment
- 1 second
Selected pricing source
Verified pricing snapshot- Provider
- OpenAI
- Model
- GPT-4o mini Transcribe
- Price per audio minute
- $0.003
- Last verified
- Jun 21, 2026
- Source
- OpenAI transcription model pricing
Uses OpenAI's published estimated cost per audio minute. Actual token usage and billing can differ.
View provider pricing source (opens in a new tab)Formula
How transcription cost is calculated
Audio length is buffered and rounded to the pricing record's billing increment before daily file volume is applied.
Billable minutes per file = rounded(audio minutes × buffer)
Daily minutes = billable minutes × files per user × active users
Monthly estimate = daily minutes × price per minute × 30
export function transcriptionCost(input: {
minutesPerFile: number;
pricePerMinute: number;
filesPerDay: number;
activeUsersPerDay: number;
safetyBufferPercent: number;
}) {
const multiplier = 1 + input.safetyBufferPercent / 100;
const billableMinutes = input.minutesPerFile * multiplier;
const totalFiles = input.filesPerDay * input.activeUsersPerDay;
const dailyCost =
billableMinutes * totalFiles * input.pricePerMinute;
return {
costPerFile: billableMinutes * input.pricePerMinute,
dailyCost,
monthlyCost: dailyCost * 30,
yearlyCost: dailyCost * 365,
};
}Example transcription estimate
A call-review product processing thirty-minute recordings for three users at ten files per user per day handles roughly nine hundred base audio minutes daily.
Add a buffer for longer-than-average recordings and use the provider tier that matches your latency requirements.
What this estimate includes
- Audio duration after safety buffer and billing rounding
- Files per active user and total daily files
- Per-file, daily, monthly, and yearly estimates
- Selected price per audio minute and verification date
Frequently asked questions
How is Whisper transcription cost estimated?
The estimator multiplies billable audio minutes by the selected model's per-minute price, then applies file and user volume. OpenAI describes some transcription rates as estimated per-minute costs.
Does silence count toward transcription cost?
Providers generally bill submitted audio duration or processed tokens, not just spoken words. Remove unnecessary silence before upload if your workflow allows it.
What is dynamic batch transcription?
Google's dynamic batch tier is designed for lower-urgency processing at a lower published price. It may not fit interactive or low-latency workflows.
Does this include multiple audio channels?
No. Some providers bill each channel separately. The estimate assumes one billable channel per file unless the pricing notes state otherwise.
Related calculators
Related glossary terms
Input tokens
Input tokens are the tokenized units sent to a model, including instructions, user content, conversation history, retrieved context, and tool definitions.
OpenRequests per day
Requests per day is the number of billable API calls made during a day. TokenMath commonly derives it from requests per active user multiplied by active users.
OpenCost per request
Cost per request is the sum of all billable usage generated by one API call, commonly input token cost plus output token cost for a text model.
Open