Work out phone data usage instantly with clear inputs, formula shown and shareable results.
Video dominates mobile data: roughly 0.5 GB per hour at 480p, 3 GB at 1080p and 7 GB at 4K. Music streaming is trivial by comparison at about 70 MB per hour, so the quality setting on video is the single biggest lever on a data allowance.
Data usage
total = video hours x rate for quality + music hours x 0.07 + other usage
Four times the pixels of 1080p plus higher bitrates for HDR. On a phone screen the visible benefit is minimal, so capping quality to 1080p saves most of the data for free.
Not against a mobile allowance. Only cellular data counts, which is why offloading video to Wi-Fi is the simplest fix for overage.