Page Size Calculator
Enter the size of the page's HTML, CSS, JavaScript and fonts in KB, and how many images there are and their average size. The calculator totals the page weight and estimates load times.
- Page weight
- Load time
- Images
Use the transfer sizes from your browser's network panel, which are compressed.
Page weight is the sum of every file the browser downloads. A page with 30 KB of HTML, 60 KB of CSS, 400 KB of JavaScript, eight images of 150 KB and 80 KB of fonts weighs 1.77 MB. That takes about 1.9 s on 4G but over 35 s on slow 3G.
Page load time chart
Plus 0.3 s of round trips. Search for a size.
| Page | Slow 3G (s) | Fast 3G (s) | 4G (s) | Broadband (s) |
|---|---|---|---|---|
| 250 KB | 5.3 | 1.6 | 0.5 | 0.34 |
| 500 KB | 10.3 | 2.8 | 0.7 | 0.38 |
| 1000 KB | 20.3 | 5.3 | 1.2 | 0.46 |
| 1500 KB | 30.3 | 7.8 | 1.6 | 0.54 |
| 2000 KB | 40.3 | 10.3 | 2.1 | 0.62 |
| 3000 KB | 60.3 | 15.3 | 3 | 0.78 |
| 5000 KB | 100.3 | 25.3 | 4.7 | 1.1 |
Seconds.
Weight and load time
Typical mix. Slide the page weight.
The bar splits by file type.
How to weigh a page
Files to load time. Step through it.
List
Every file.
Test on a real phone over mobile data.
Light, average or heavy page
Page weights. Compare them.
Light.
Typical.
Heavy.
Images and JavaScript are usually the heaviest parts.
Before you launch
Speed checks. Tick each item.
Tick each item as you go.
Run a Lighthouse test for more ideas.
What you get
Page sizing. Each tile explains one result.
KB or MB.
By connection.
Share.
Weight.
By type.
Next-gen image formats can cut image weight by half.
Frequently Asked Questions
No question matches that search.
How big should a web page be?
Under about one megabyte loads quickly on most phones.
How do I find my page size?
Open the browser's network panel and read the transferred total.
What makes pages heavy?
Mostly large images and JavaScript.
How long does a two megabyte page take on four G?
About two seconds.
Does page size affect search ranking?
Indirectly, through load speed and Core Web Vitals.
How can I make my page lighter?
Compress images, lazy load them and remove unused code.
What is the median web page size?
About two megabytes on mobile.
A faster page
Weigh every part of your page and trim the heaviest to load fast on any connection.
More size calculators
Each one has its own calculator, worked examples and answers to common questions.