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Margin of Safety Calculator

Turn an intrinsic-value estimate into a disciplined price to buy below.

The Value Investor's Buffer

The discount that protects you from being wrong

Buy-Below Price

The exact price for your target margin

Instant Verdict

Is today's price already in your buy zone?

Margin of Safety

Compare a stock's intrinsic value to its price, and find the price to buy below at your target margin.

How the Margin of Safety Works

The Formula

MoS = (Intrinsic Value − Price) ÷ Intrinsic Value
Buy below = Intrinsic Value × (1 − target)

The margin of safety is the percentage discount to fair value. Flip it around and you get the highest price you should pay to lock in your chosen margin.

Size It to Your Uncertainty

A precise, stable business might justify a 20–25% margin; a cyclical or speculative one warrants 40–50% or more. The margin is where you bake in humility about your own intrinsic-value estimate.

Full Portfolio Analytics

Want deeper insights?

ARIA tracks intrinsic value, margin of safety, and risk across every holding — so the discipline you apply to one stock here scales to your whole portfolio.

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