Lump sum & contribution
How much do you invest today as a one-off, and how much do you add each month? Both feed into the projection.
€
€0€200,000
€
€0€2,000
years
140
The barbell strategy: 85% extremely safe, 15% deliberately risky — nothing in between. Calculate the projected value and compare it honestly with 100% stocks.
Nassim Taleb's barbell strategy avoids the middle ground: around 85% in maximally safe assets (cash, short-term government bonds) and around 15% in deliberately high-risk, convex bets. You can't lose more than the 15%, while the upside stays open — Taleb calls this antifragile.
Source: Nassim N. Taleb, "Antifragile" (2012) & "The Black Swan" · return assumptions per asset class
How the calculator works
How much do you invest today as a one-off, and how much do you add each month? Both feed into the projection.
85% safe anchor + 15% risk lever — the fixed ratio of the barbell strategy. There's nothing to adjust.
You see the projected portfolio value, the breakdown of both barbell ends and the honest benchmark against 100% stocks.
→ Result: projected portfolio value + breakdown by asset class + return given up versus 100% stocks.
Allocation, projected growth versus a pure stock portfolio and the historical metrics — all live from your inputs above.
The barbell strategy is projected with two assumptions: 85% safe anchor at 2.0% (cash / short-term government bonds) and 15% risk lever at 7.0% (modelled as stocks), p.a. (nominal).
Blended, this gives an expected return of around 2.75% p.a. From that we project the lump sum and monthly contribution over the term (monthly compounding, annuity formula).
Benchmark 100% stocks: the same contributions at 7% p.a. — so you can see the big return you give up for the safety anchor.
Important: Taleb's risky part is meant as a highly convex bet (e.g. options, venture). Modelled as stocks, the calculation understates the possible upside — which is the whole point of the strategy. Model calculation excluding taxes/costs/inflation, no guarantee.
The barbell strategy caps the loss at the small risk portion — and leaves the upside open.
Taleb's idea: extremes instead of the middle. ~2.5–3.5% p.a. modelled — low, because 85% sits parked safely. The value lies in the capped loss and the open upside of the 15% portion.
The risky part is meant to be convex: limited risk, open upside. With ordinary stocks it's a softened barbell — the pure doctrine uses options, for example.
Four typical situations where opening it really pays off:
Rule out a large capital loss — stay calm when others panic.
In retirement, stability often matters more than the last bit of return.
How much return does the stability cost you versus 100% stocks?
How much flows into the safe anchor, and how much into the risk portion (85/15)?
Expected return = 85%·2% (safe) + 15%·7% (risky) ≈ 2.75% p.a. The lump sum + contribution are then compounded monthly.
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