Quick Answer — How Is a Website Hosting Bill Calculated?
Most hosting plans bill a flat monthly base fee that includes a fixed allowance of bandwidth (data transfer) and storage, then charge a per-GB overage rate for usage beyond those allowances. The formula: Total Monthly Cost = Base Fee + Bandwidth Overage + Storage Overage, where each overage is max(0, Used - Included) × Overage Rate.
The `max(0, ...)` matters: if your actual usage stays under the included allowance, that overage line is exactly zero — you never pay less than the base fee, but you also never see an overage charge unless you actually exceed what's included.
Worked example: an $12/month plan including 100 GB bandwidth and 20 GB storage, with a real month using 250 GB bandwidth and 35 GB storage at $0.10/GB and $0.15/GB overage rates respectively. Bandwidth overage = (250 − 100) × $0.10 = $15. Storage overage = (35 − 20) × $0.15 = $2.25. Total = 12 + 15 + 2.25 = $29.25/month — more than double the advertised base price, entirely from overage.