S&P 500 30-Day Implied Move from VIX
May 5, 2026
At the current VIX reading of 18.29 1, the S&P 500 is pricing approximately ±5.3% volatility over the next 30 days. With the index at $7,200.75 1, this translates to an expected trading range of roughly $6,819 to $7,582, or ±$381 from the current level.
Key takeaways
- VIX translates to 5.3% annualized monthly move: The standard formula σ_30d = VIX / 100 × √(30/365) = 0.1829 × 0.2868 = 0.0524, or 5.24%, rounds to 5.3%. This represents one standard deviation under log-normal assumptions 1.
- VIX is near 5-year lows: At 16.99 on 2026-05-01 per FRED data, VIX sits at the 41st percentile over the past 5 years 2, indicating subdued expected volatility relative to recent history, though not extreme complacency.
- VIX has compressed 31% in one month: The 30-day decline of −30.77% 2 reflects a persistent bid for risk assets and reversion from late-April spikes. Over 52 weeks, VIX is down 48.2% from its high, signaling normalized market conditions 1.
- ATM straddle premium implies similar move: A synthetic long straddle at spot ($7,200.75) would cost approximately 0.798 × spot × σ_30d = 0.798 × $7,200.75 × 0.0524 ≈ $300, reinforcing the ±5.3% band as the market's priced friction for a one-month hold 1.
Signal table
| Signal | Value | Horizon | Note |
|---|---|---|---|
| VIX spot 1 | 18.29 | Current | +7.65% vs prior close; -24.33% past month |
| SPX spot 1 | $7,200.75 | Current | -0.41% vs prior close; +8.91% YTD |
| 30-day expected move (1σ) | ±$381 (±5.3%) | ~30 days | Derived from VIX; implies range $6,819-$7,582 |
| VIX 5-year percentile 2 | P41 | Historical | 16.99 reading on 2026-05-01; regime is mid-range |
Cross-check
Yahoo Finance's spot VIX of 18.29 is marginally higher than FRED's most recent 16.99 (2026-05-01), a minor discrepancy expected during pre-market hours and across data-refresh delays. The directional signal, low to moderate implied volatility, is consistent across both sources. The 1-month VIX decline of roughly 31% aligns with the S&P's +8.91% monthly gain, a typical inverse relationship where rising equity prices compress fear metrics.
Caveats
- VIX lags intraday spikes: The 18.29 reading reflects yesterday's settlement (2026-05-04 close). If overnight or early-session trading produces sharp moves, the implied volatility may already be stale by market open.
- Log-normal assumption: The ±5.3% band assumes continuous compounding and symmetric tails. Actual returns may exhibit fat tails or skew, particularly around earnings or Fed communications, making the band a soft guide rather than a hard boundary.
- 30-day window is approximate: "~30 days" reflects convention; the precise window depends on whether you measure to 2026-06-04 or to an options expiration cycle, which may fall on a different date.
References
Model-derived probabilities anchored to current data; not investment advice. Past base rates and current market-implied probabilities do not guarantee future outcomes.