# Bitrate Calc (bit rate, file size, and length calculator)

> Calculates bitrate, file size, and time length; converts SI/binary file size prefixes. (iPhone/iPad app by Yuichi Sakashita.)

- Source: https://appshunter.io/ios/app/bitrate-calc-bit-rate-file-size-and-length-calculator/id895822657 (this page in markdown: same URL + `.md`)
- Developer: [Yuichi Sakashita](https://appshunter.io/developer/895822660)
- Category: Utilities, Productivity
- Price: Free
- Rating: 5.00/5 from 3 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 7.0 · 4 MB
- Languages: English, Japanese
- Released: 2014-07-20
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/bitrate-calc-bit-rate-file-size-and-length-calculator/id895822657/reviews.md

## What is Bitrate Calc (bit rate, file size, and length calculator)?

With this app, you can calculate each bitrate, time length and file size from other two items.
- Filesize / Bitrate (transfer speed) = Length (transfer time)
- Bitrate * Length = Filesize
- Filesize / Length = Bitrate
- and filesize SI prefix (KB, MB, GB, etc..) to/from binary prefix (KiB, MiB, GiB, ...) converter.

You can use this app when you want to know...
- how long does it take to backup 200GB data with USB2.0 HDD.
- how much data will be transferred if you watch a 720P youtube video 30 minutes.
- what is the maximum bitrate you can use to encode a 100MB, 30minutes video. 
- how many terabytes you can actually use with 3TB HDD.

About Unit
With bitrate, units are always SI prefix (1kbps = 1000bps, 1Mbps = 1000kbps). As for file size, you can use both the SI prefix and binary prefix (1KiB = 1024 bytes, 1MiB = 1024KiB). If you are using Windows, Explorer's "KB" equals this app's "KiB". If you are using Mac or Ubuntu, its "KB" equals this app's "KB".

## Key features

- Calculate bitrate from file size and length
- Calculate file size from bitrate and length
- Calculate length from file size and bitrate
- Convert between SI and binary file size prefixes
- Estimate transfer times
- Determine data usage for video playback

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/bitrate-calc-bit-rate-file-size-and-length-calculator/id895822657/reviews.md

### 5/5 — Plz update for iOS 15.4

*2022-03-26, version 1.0.0*

I REALLY need this app works😭😭😭

### 5/5 — Great

*2021-02-10, version 1.0.0*

This is exactly what I was looking for, a calculator that would convert video bit rates to file sizes.  Unfortunately the app won’t work in future OSes unless the dev updates it.

## Frequently asked questions about Bitrate Calc (bit rate, file size, and length calculator)

### What calculations can Bitrate Calc perform?

Bitrate Calc allows you to calculate bitrate, file size, and time length by inputting any two of these values. It also includes a converter for SI and binary file size prefixes.

### How does Bitrate Calc handle file size units?

For file sizes, Bitrate Calc supports both SI prefixes (KB, MB, GB) and binary prefixes (KiB, MiB, GiB). This allows for accurate conversions, as Windows' 'KB' is equivalent to Bitrate Calc's 'KiB'.

### What are some practical uses for Bitrate Calc?

You can use Bitrate Calc to estimate how long it will take to back up data, how much data a video stream will consume, or the maximum bitrate for encoding a video of a specific size and duration.

### Is Bitrate Calc available on multiple devices?

Yes, Bitrate Calc is supported on iPhone, iPad, and iPod, making it accessible for users across Apple's mobile ecosystem.

### How often is Bitrate Calc updated?

Bitrate Calc was last updated on July 20, 2014, with version 1.0.0. The initial release date was also July 20, 2014.

### What is the age rating for Bitrate Calc?

Bitrate Calc has an age rating of 4+, making it suitable for a wide range of users.

### Does Bitrate Calc have ads?

The provided data does not specify whether Bitrate Calc contains advertisements. However, it is listed as free with no in-app purchases.

### What is the user feedback on Bitrate Calc?

Bitrate Calc has received excellent user feedback, holding a rating of 5.0 stars from 3 ratings.

## Version history (last 1 release)

### 1.0.0 — 2014-07-20

No release notes.

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All apps by Yuichi Sakashita: https://appshunter.io/developer/895822660

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*