What Is Rho in Options Trading?
Rho measures the sensitivity of an option's price to a 1% change in interest rates. A call option with a rho of 0.05 would gain $0.05 per share ($5 per contract) if interest rates increased by 1 percentage point.
Calls have positive rho (they benefit from rising rates). Puts have negative rho (they lose value when rates rise). This makes intuitive sense: higher rates increase the cost of carry for holding stock, making call options relatively more attractive.
Why Rho Is Usually Ignored
For short-dated options, rho is negligible. A 30 DTE SPY call might have a rho of 0.02. Even if rates moved 0.25% (a full Fed rate cut or hike), the impact would be about $0.005 per share—a rounding error compared to delta, theta, and vega effects.
This is why most traders never think about rho, and for weeklies and monthlies, they're right not to.
When Rho Actually Matters
LEAPS and long-dated options: A 2-year LEAPS call on a $200 stock might have a rho of 0.35. A 1% rate change would move the option by $0.35/share, or $35/contract. If the Fed cuts rates by 1% over six months, that's a meaningful headwind for long LEAPS calls.
Changing rate environments: Between 2022 and 2023, the Fed raised rates by over 5%. LEAPS call prices incorporated this gradually, and traders holding long-dated calls got a tailwind from rising rates. In a cutting cycle, the opposite occurs.
Large portfolio exposure: If you hold 50 LEAPS contracts, even modest rate changes create measurable P&L effects that show up in your portfolio.
Rho Values by Expiration
| Expiration | ATM Call Rho (per 1% rate change) |
For puts, flip the sign: a 365 DTE ATM put has rho of approximately -$0.23.
The Carry Trade Connection
Rho reflects the cost of carry in options pricing. When you buy a call instead of stock, you're avoiding the capital cost of owning shares. Higher interest rates make this advantage bigger, which is why call prices increase with rates.
Conversely, put holders are "deferring a sale." Higher rates make this deferral more costly, reducing put values.
In practice, this means:
Should You Factor Rho into Trading?
For most retail traders: no. If you're trading 30-60 DTE options, delta, theta, gamma, and vega completely dominate rho.
For LEAPS traders: yes, marginally. If you hold LEAPS calls as stock replacement and the Fed is in an active cutting cycle, understand that falling rates create a persistent drag on your position, separate from stock movement, time decay, and IV changes. You might see your LEAPS call underperform the expected delta gain.
For portfolio managers: Large portfolios with significant long-dated options exposure should track rho alongside the other Greeks for accurate risk measurement.
Rho is the least exciting Greek, but knowing when it matters—primarily during active rate cycles on long-dated positions—prevents confusion when your LEAPS don't behave exactly as delta and theta predict.