Prepay vs Pay-As-You-Go Calculator

About this calculator

A prepaid plan bundles a fixed price with a set number of included units and charges an overage rate for anything used beyond that allowance, while pay-as-you-go pricing simply multiplies actual usage by a flat per-unit rate with no upfront commitment. Which one is cheaper depends entirely on where your expected usage falls relative to the plan's included allowance: use far less than the included units and you overpay for capacity you never touch; use far more and uncapped overage fees can make the prepaid plan more expensive than it first looked.

Consumers and businesses run this comparison for phone and data plans, cloud infrastructure tiers, SaaS usage-based billing and utility contracts — anywhere a provider offers both a bundled and a metered pricing option — because the break-even usage level is rarely obvious from the price sheet alone.

This calculator takes the prepaid plan's price, included units and overage rate alongside the pay-as-you-go per-unit rate and your expected usage, and tells you which option costs less at that usage level, so you can pick a plan based on your actual consumption rather than guesswork.