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Margin of Safety Calculator
Enter your intrinsic value estimate and current market price — get your margin of safety percentage instantly, with sector-based thresholds so you know what buffer is actually enough.
Your fair-value estimate — from DCF, Graham Number, or multiples
The stock's current trading price
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Recommended Minimum Margin of Safety by Sector
The required buffer depends on how predictable the business is. The harder it is to estimate intrinsic value accurately, the wider the margin you need to protect against error.
| Risk Profile | Sectors | Min. MOS | Rationale |
|---|---|---|---|
| Cyclical / Commodity | Energy, Materials, Industrials | 40%+ | Earnings swing with commodity cycles — errors in intrinsic value estimates are larger |
| Stable / Defensive | Utilities, Consumer Staples, Healthcare | 25%+ | Predictable cash flows reduce estimation error, allowing a thinner buffer |
| Growth | Technology, Consumer Discretionary | 20%+ | Growth is priced in; a large MOS may be impossible — focus on DCF scenario range instead |
| Financial Services | Banks, Insurance | 35%+ | Leverage amplifies balance-sheet errors; a wider margin compensates for opacity |
How to estimate intrinsic value
Frequently Asked Questions
What is margin of safety in investing?
Margin of safety is the discount between a stock's intrinsic value and its current market price, expressed as a percentage. It was popularized by Benjamin Graham in The Intelligent Investor as the central concept of value investing. A 30% margin of safety means you're paying $70 for something worth $100 — the 30-point gap protects you if your intrinsic value estimate turns out to be wrong.
What margin of safety percentage is considered safe to buy?
Graham himself typically required a 30–50% margin of safety for his 'defensive investor' standard. In practice, the right threshold depends on the quality and predictability of the business. Stable, asset-heavy businesses might warrant 25%; cyclical businesses or those with opaque financials require 35–40% or more. The less certain your intrinsic value estimate, the wider the margin you need.
How do I calculate intrinsic value for margin of safety?
The most common approaches are: (1) DCF analysis — project free cash flows 5–10 years out, apply a terminal growth rate, and discount at WACC or your required return. (2) Graham Number — √(22.5 × EPS × Book Value Per Share), suitable for profitable asset-heavy companies. (3) Multiples-based — apply a peer-group P/E or EV/EBITDA to normalized earnings. Each method has blind spots; running two or three and comparing the range is more reliable than any single number.
Can margin of safety be negative?
Yes. A negative margin of safety means the current price exceeds your intrinsic value estimate — the stock appears overvalued by your analysis. It does not necessarily mean the stock will fall; your estimate may be wrong, or the market may be pricing in growth your model doesn't capture. A negative margin of safety is a signal to demand more evidence before buying, not an automatic sell signal.
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