Good engineering decisions are data-driven. These tools help you set measurable performance targets, track real-world metrics, and understand the quantitative tradeoffs behind every architectural choice you make.
Rather than guessing whether a page is "fast enough," these calculators give you concrete budgets grounded in device capabilities, network conditions, and measured benchmarks.
Calculate how many kilobytes your page can transfer and still load within a time budget, given real-world device and network constraints. Based on Alex Russell's transfer budget methodology.
Open ToolBreak down page weight by resource type (HTML, CSS, JS, images, fonts) and visualize the composition of your transfer size. Identify the heaviest contributors.
Open Tool