The score calculators turn a finished practice set into an unofficial SAT (400-1600) or ACT (1-36) estimate, shown as a range rather than a single false-precision number.
The full explanation, including the published curves and the ACT composite rule, is on the methodology page. In short: practice results map through a published practice-test chart, the SAT total sums the two sections, and the ACT composite averages English, Math, and Reading.
Tracking progress, choosing targets, and deciding whether to retake. It is not a prediction of an official score, and it cannot account for a future test's curve. Guides: SAT scoring, ACT scoring, good SAT scores.
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