Free Technology Calculators

The GNW toolbox

Small tools. Clear answers.

Plan a download, size your storage, or estimate a device’s electricity cost. Free, with no account required.

Estimate a file transfer before you start.

How many files will fit?

See what a device costs to run.

Your inputs stay in this page. Calculators do not send or save them. The site’s normal analytics and advertising policies still apply.

Each calculator includes its formula, an example and the limits of the estimate. Pair the results with our computing guides and gadget explainers.