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.

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