💻
Gzip Savings Calculator
See how much bandwidth compression saves from the original and compressed file sizes.
Original size
Compressed size
Loading calculator…
How it works
Saved % = (original − compressed) ÷ original × 100
Text assets like HTML, CSS and JS compress well with gzip or brotli, often shrinking 60–80%. The saving is the drop in bytes as a share of the original — smaller transfers mean faster page loads.
Worked example
250 KB compressed to 70 KB saves 72% of the bandwidth.
Frequently asked questions
Does compression hurt performance?
CPU cost to decompress is tiny compared with the transfer time saved, so it almost always speeds pages up.
What compresses well?
Text (HTML/CSS/JS/JSON) compresses a lot; already-compressed images and video barely shrink.
Related calculators
Download Time Calculator
How long a file takes to download at your connection speed — with the megabits-vs-megabytes conversion done correctly.
Data Transfer Cost Calculator
What a metered data plan or overage actually costs — included allowance, extra usage and the per-gigabyte rate turned into a real bill.
This calculator is for educational purposes. Double-check important results before acting on them.