About ThrowCalc & our methodology
ThrowCalc is a data tool: every page is a real calculation or an aggregated, sourced spec — never spun prose. This page explains exactly how the numbers are produced so you can trust them.
How we calculate throw distance
Throw distance = image width × the projector’s throw ratio. For a 16:9 screen we convert the diagonal to width (width = diagonal × 0.872), then multiply by the model’s throw-ratio range. The on-screen brightness estimate is the rated lumens divided by the screen area (in foot-lamberts) — an indicative, comparative figure, not a calibrated measurement. Every distance and brightness figure on the site is computed live from the model’s specifications, not hand-entered.
Where our data comes from
Throw ratios, brightness, resolution and input lag are taken from ProjectorCentral spec pages and the manufacturers’ own datasheets, and cross-checked before publishing. Prices are indicative street prices and move over time — always confirm the current price at the retailer. We do not fabricate hands-on testing or review scores; the value here is aggregated, verifiable data, not opinion.
Who runs ThrowCalc
ThrowCalc is operated by Rafał Bajda. It is an independent reference site, not affiliated with any projector manufacturer. Some outbound links are affiliate links (see the affiliate disclosure) — they never change which products we list or the data we show.
How often we update
The projector and screen datasets are reviewed and expanded as new models launch; specs are re-checked against the sources on update. This methodology was last reviewed on 2026-06-25.