Quantify the saving from compressing and correctly sizing images.
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.
Image Optimization Savings
Optimised weight = original × (1 − compression) × (1 − resize saving)
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.
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.
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.