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Delta hedging offsets an option position's directional exposure using the underlying itself, so small moves in price stop mattering to the combined position's value — the practical, real-world application of the Delta concept.

Delta measures how much an option's price moves for every 1-point move in the underlying. Delta hedging takes that number and uses it directly: to neutralize a position's directional exposure, take an opposite position in the underlying sized to exactly offset the option's Delta. Once hedged, small moves in the underlying no longer change the combined position's value — at least not immediately, which is the important caveat covered further down.

The size of the hedge is just the position's total Delta, converted into underlying units:

Hedge size = Option Delta × Lot Size

For a long call, that means shorting the underlying (or an equivalent short futures position) by that amount. For a long put, it means buying the underlying, since a put's Delta is already negative.

Using the exact same setup as the Delta and Gamma pages: Nifty at 24,000, 7 days to expiry, 13% IV. Suppose you're long 1 lot (65) of the at-the-money 24,000 call, Delta 0.531.

1. Calculate the position's total Delta exposure: 0.531 × 65 = 34.52 — the position currently behaves like owning about 34.52 units of Nifty outright.
2. To hedge, short approximately 35 units of Nifty (via futures or an equivalent instrument) — this brings the combined position's net Delta close to zero.
3. Nifty then rises 100 points, to 24,100.
4. The call's Delta shifts to 0.621 (this exact move is the worked example on the Gamma page) — the position's total Delta exposure is now 0.621 × 65 = 40.37.
5. The original hedge of 35 units is no longer enough. An additional 40.37 − 34.52 = 5.85 (roughly 6 more units) needs to be shorted to stay delta-neutral.

This rebalancing need is a direct consequence of Gamma — Delta doesn't stay fixed as the underlying moves, so a hedge sized for today's Delta drifts out of balance as soon as the underlying moves at all.

A higher-Gamma position needs more frequent rehedging, since its Delta moves faster for the same size move in the underlying. This connects directly to a fact already established on the Gamma page: Gamma is highest for at-the-money options and grows sharply as expiry approaches. Practically, this means a delta-hedged at-the-money position close to expiry can require rebalancing far more often than the same hedge would need weeks earlier — the underlying risk hasn't necessarily grown, but the pace at which the hedge goes stale has.

• Market makers and large option sellers delta-hedge routinely — it's how a dealer can sell options to clients all day without taking on the underlying's full directional risk themselves.
• Some volatility strategies are deliberately built to start near delta-neutral without a separate underlying hedge — the Iron Condor's own near-zero net Delta, computed directly on the Delta page, is one example of a position achieving something similar to a hedge purely through its own option legs.
• A trader who wants pure exposure to Gamma, Theta, or Vega (rather than direction) often uses delta hedging specifically to strip out the directional component and isolate the Greek they actually want exposure to.

• A delta hedge only neutralizes risk at the instant it's set. As shown above, it goes stale as soon as the underlying moves, and needs active rebalancing to stay effective.
• Frequent rebalancing has real transaction costs — each adjustment involves buying or selling the underlying, and those costs add up, especially for high-Gamma positions needing frequent attention.
• Delta hedging neutralizes directional risk specifically — not all risk. A delta-neutral position can still lose money from Theta decay, Vega swings, or a large enough Gamma-driven move between rebalancing.