File Size Calculator

Estimate how big an audio, video or image file will be — and how long it will take to download.

FreeNo sign-upRuns in your browserMobile-friendly

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What does the File Size Calculator do?

Three calculators in one. Audio/video: size = bitrate × duration ÷ 8, so a 10-minute 1080p video at 5 Mbps is about 375 MB. Uncompressed image: width × height × bit depth ÷ 8, which shows why a 12-megapixel photo is 36 MB uncompressed but only a few MB as a JPG. Download time: file size × 8 ÷ connection speed, with an overhead allowance for real-world networks.

Internet speeds are quoted in megabits per second (Mbps) while file sizes are in megabytes (MB) — a factor of 8 that the calculator handles for you.

How to use the File Size Calculator

  1. Choose a calculation type.
  2. Enter bitrate and duration, image dimensions, or file size and speed.
  3. Read the estimate and the breakdown.

Examples

Download

A 2 GB file at 20 Mbps with 10% overhead takes about 14 min 49 s.

Podcast

60 minutes at 128 kbps ≈ 57.6 MB.

Common use cases

  • Planning storage for recordings
  • Estimating upload and download times
  • Video and podcast production
  • Explaining file sizes to clients

Features and benefits

  • Private by design — your data is processed on your device and never uploaded.
  • Free with no account, no watermark and no usage limits.
  • Works on phones, tablets and desktops in any modern browser.

Limitations to know

  • Real video files vary with variable bitrate and codec settings.
  • Download time depends on server speed and network conditions.

Frequently asked questions

Why is my download slower than my plan speed?

Plans are in megabits; files in megabytes (÷8). Overhead and congestion reduce speed further.

How big is 1 hour of 1080p video?

At 5–8 Mbps, roughly 2.25–3.6 GB.

What is bitrate?

The amount of data per second of audio or video.

Embed this tool on your website

Add the free File Size Calculator to your blog or website. Paste the code into your page’s HTML; the tool runs in your visitors’ browsers and stays up to date automatically. Please keep the credit line below the tool.

Free to use on any website. The tool runs inside an iframe served from viptools.pk; nothing your visitors type is sent to your site or ours. Preview the embedded version.

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