How to Select the Right Strike Price for NIFTY Options
Updated May 2026 · By PaperBull Editorial Team
One of the questions I get most from new options traders: "Should I buy an ATM option or an OTM option?" The answer depends on several factors that most beginner guides don't fully explain. Strike selection is one of the most important decisions in options trading — it affects your probability of profit, your maximum loss, and how the option behaves as the market moves.
The Three Categories of Strikes
In The Money (ITM)
CE: Strike below current price
PE: Strike above current price
- Higher premium
- High Delta (0.6–0.9)
- Less Theta decay
- More responsive to price
At The Money (ATM)
Strike closest to current market price
- Maximum time value
- Delta ~0.5
- Highest absolute Theta
- Most actively traded
Out of The Money (OTM)
CE: Strike above current price
PE: Strike below current price
- Cheapest premium
- Low Delta (0.1–0.4)
- High % Theta decay
- Needs big move to profit
Delta: The Most Important Guide for Strike Selection
Delta tells you approximately how much the option premium will change for a 1-point move in NIFTY. An ATM NIFTY option has Delta of about 0.5 — so if NIFTY moves 100 points, the option moves about 50 points.
More practically: Delta represents the approximate probability that the option will expire in the money. A Delta of 0.5 means roughly 50% chance of being profitable at expiry. A Delta of 0.2 means roughly 20% chance.
Strike selection based on your conviction:
- High conviction trade: Buy ATM or slightly ITM. Higher probability of profit, higher capital required.
- Moderate conviction: Buy OTM with Delta 0.25–0.35. Lower cost, decent probability if your view is right.
- Lottery ticket / very aggressive: Deep OTM (Delta below 0.15). Very cheap, almost certainly expires worthless but could be a 10x if the move is massive.
How Timeframe Affects Strike Choice
| Holding Period | Recommended Strike | Reasoning |
|---|---|---|
| Intraday (same day) | ATM or slightly OTM | Quick moves, premium is cheap intraday, no overnight Theta risk |
| 1–3 days | ATM or ITM | Theta decay is heavy; don't pay too much for OTM that might not move enough |
| 3–7 days (weekly expiry) | 1 strike OTM to ATM | Balanced risk-reward for moderate expected moves |
| 2–4 weeks (next expiry) | ATM to 1-2 strikes OTM | More time gives OTM options a chance to work |
| 1–3 months | OTM to ATM | More time reduces Theta impact; OTM can provide better returns if right |
The OTM Lottery Trap
Far-OTM options are attractive because they're cheap — you can buy a NIFTY 25,500 CE for ₹5 when NIFTY is at 24,500. With a 75-lot lot size, that's only ₹375 at risk. If NIFTY somehow hits 25,500, this becomes worth ₹1,000+ — a 200x return.
The problem: NIFTY needs to move 1,000 points (about 4%) before expiry for you to make money. That happens occasionally, but it's a very low-probability bet. Most of the time these options expire at zero. Chasing lottery tickets is how many retail traders slowly bleed their capital — winning occasionally but losing far more often.
A better approach for the same capital: buy 1 ATM option for ₹150 (₹11,250 per lot) where your Delta is 0.5 and you have a genuine probability of profiting from a normal-sized market move.
Test Different Strike Selections on PaperBull
PaperBull shows you live Delta, Theta, and other Greeks in the option chain. Practice picking strikes for different scenarios and see exactly how each one performs — all with virtual capital.
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