ATR summarizes realized trading ranges. An option-implied move comes from market prices and a chosen formula or distribution assumption. Neither predicts direction.
What ATR describes
Average True Range uses recent high, low and previous-close relationships to summarize observed range, including gaps. Its value depends on the lookback and bar interval. A daily 14-period ATR is expressed in price units and looks backward.
ATR does not say whether the next move will be up or down, and it is not automatically a one-day standard deviation. Multiplying ATR by days without a tested model can create false precision.
What “expected move” may mean
Traders use several conventions: a straddle-based estimate, an implied-volatility formula, or a model percentile. Those methods need not agree. The label should disclose the horizon, formula, option prices, timestamp and whether the result represents one standard deviation or another interval.
Implied volatility is derived from prices under a model; it is not a direct consensus forecast of the realized path.
Use both as context
ATR can show whether a proposed price target is large relative to recent daily ranges. Option prices can show how the market is charging for uncertainty over the relevant horizon. A careful review compares them without converting either into an unsupported success probability.