What Ads & Trackers Actually Cost You
A single unprotected page load of a tracker-heavy site pulls about 363 KB of ad-tech payload from ~12 handshaking third-party domains. At the average of 50 page loads per day, that is roughly 27-55 GB of tracker bandwidth per year — and the browsing data it harvests is worth $200-400 per year to data brokers. Here is the measured cost, in bytes and dollars.
How much data do ads and trackers actually use?
We wired a faux news homepage to 46 live ad, tracker, and fingerprint endpoints and measured what a naked browser downloads, averaged over 20+ iterations. The numbers below are the aggregate cost of an unprotected browser, projected to a typical browsing year.
| What it costs | Per page load | Per year (50 pages/day) |
|---|---|---|
| Tracker payload (bytes) | ~363 KB | 27–55 GB |
| Third-party requests | ~72 | ~1.3 million |
| Domains that handshake with you | ~12 | thousands of profile updates |
| Trackers delivering real payload | ~7 | continuous behavioral logging |
| Market value of your browsing data | — | $200–400 |
Why "blocked requests" is the wrong number
Most ad blockers brag about how many requests they blocked. That number is close to meaningless. A blocker that fires 55 "blocked" events while still letting 363 KB of tracker payload onto your page is blocking requests cosmetically, not defending your bandwidth. The honest metric is byte block rate: of the ~363 KB of tracker payload a naked browser downloads, what percentage never reached you? That is the number that turns into real gigabytes and real dollars saved.
How much of my mobile data is ads?
On a metered cellular plan, tracker bytes cost you money directly. At 50 page loads a day, the measured 363 KB-per-page payload projects to roughly 75-150 MB per day, or 27-55 GB per year, of bandwidth you are paying for so that ad networks can profile you. A blocker with a high byte block rate reclaims almost all of it.
How much is my browsing data worth?
Every unblocked tracker request adds an identifier to a data broker's graph of you. Aggregated across a year, data-market analyses put the value of one person's browsing and behavioral data at roughly $200-400. You are not the customer of the "free" web; you are the inventory.
Methodology
- A fixture news page is wired to 46 real ad/tracker/fingerprint endpoints across ~12 distinct hostnames.
- The Resource Timing API records every third-party request, which ones handshake, and the transferred bytes.
- Baselines are the mean of 20+ iterations of naked Chromium against the fixture; the tracker payload figure (~363 KB) is the measured transferred bytes of third-party payload.
- Annual projections use 50 page loads/day × 365 days, the average for a working internet user.
- Nothing is logged server-side; the test runs entirely in your browser.
measure your own overhead
See how many of these bytes your current setup actually keeps off the page. Runs in your browser, nothing logged.
> RUN THE TEST// data sources & further reading
- Englehardt, S. & Narayanan, A. (2016). Online tracking: A 1-million-site measurement and analysis. Princeton CITP.
- HTTP Archive Web Almanac (2023-2025). Page-weight and third-party distribution data.
- Mozilla Research (2021). The performance impact of third-party web trackers.
- Financial Times (2019); Bloomberg / WaPo / EFF (2020-2025). Data-broker pricing analyses.
All figures reproducible at adbloat.com. Reuse under CC BY 4.0 with a link back. Updated as the fixture and networks change.