Your GitHub Actions bill is mostly macOS minutes (here's how to tell)

If your GitHub Actions bill surprises you, look at the macOS line first. A macOS runner minute bills at roughly ten times a Linux minute, and the xlarge tiers cost more still. One ten-minute macOS job is a hundred Linux-equivalent minutes. Run it on every PR and it is almost certainly the biggest single line on your bill.

The multipliers

Linux is the baseline (about $0.006/min on a standard 2-core runner in 2026).

Windows bills roughly 2x Linux.

macOS bills roughly 10x Linux, and the arm64 xlarge tiers bill above that.