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Image Optimization Savings Calculator

Quantify the saving from compressing and correctly sizing images.

About Image Optimization Savings Calculator

Compression and correct sizing multiply rather than add, so combining them typically removes 70 per cent or more of image weight. Images are usually the largest component of page weight. Serving a 2,000-pixel image into a 400-pixel slot wastes about 96 per cent of the pixels downloaded, which correct sizing eliminates entirely.

Formula

Image Optimization Savings

Optimised weight = original × (1 − compression) × (1 − resize saving)

resize saving
Serving images at display size rather than full resolution

Worked example

With the default values below, Image Optimization Savings Calculator returns Weight Saved per Page of 4,603.2. Change any input above and every figure here is recalculated in your browser.

Inputs used

Number of imagesminimum 0
28
Average image sizeminimum 0 KB
240 KB
Saving from compressionaccepts 0–100 %
55 %
Additional saving from correct sizingaccepts 0–100 %
30 %
Monthly visitsminimum 0
60,000

Results

Weight Saved per Page
4,603.2 KB
Optimised Total Image Weight
2,116.8 KB
Original Total Image Weight
6,720.0 KB
Monthly Bandwidth Saved
263.397 GB
Total Weight Reduction
68.50%

Step by step

  1. 1Values used
  2. 2Image Optimization Savings
  3. 3Weight Saved per Page= 4,603.2 KB
  4. 4Optimised Total Image Weight= 2,116.8 KB
  5. 5Original Total Image Weight= 6,720.0 KB
  6. 6Monthly Bandwidth Saved= 263.397 GB
  7. 7Total Weight Reduction= 68.50

Assumptions and limits

  • The result is derived only from the 5 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Image Optimization Savings calculated?

Optimised weight = original × (1 − compression) × (1 − resize saving) Compression and correct sizing multiply rather than add, so combining them typically removes 70 per cent or more of image weight. Images are usually the largest component of page weight.

Why does Image Optimization Savings matter?

Serving a 2,000-pixel image into a 400-pixel slot wastes about 96 per cent of the pixels downloaded, which correct sizing eliminates entirely.

What values do I need to enter?

This calculator takes 5 inputs: Number of images, Average image size, Saving from compression, Additional saving from correct sizing, Monthly visits. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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