Is this investment advice?

No. It is an educational stress-test calculator only and does not recommend any investment action.

Does it use live stock market data?

No. Enter the latest drop percentage from your brokerage, index chart or market source.

Why is recovery gain larger than the decline?

Because gains are calculated from the reduced value. For example, a 20% loss requires a 25% gain to return to the starting value.

Stock Market Drop Impact Calculator – Estimate Portfolio Drawdown

What this calculator does

The Stock Market Drop Impact Calculator turns a market decline percentage into a portfolio-level dollar estimate. It is useful when headlines say the market fell 5%, 10%, or 20% and you want to understand the approximate effect on your own allocation.

Not investment advice: this is an educational calculator only. It does not predict markets, recommend trades, evaluate risk tolerance, or replace advice from a qualified financial professional.

Quick answers

Why exposure mattersA 10% stock drop does not mean your whole portfolio drops 10% if part of it is in cash, bonds or other assets.

What is recovery gain?After a drop, the gain needed to recover is larger than the decline. A 20% drop requires a 25% gain to return to the old value.

Is this a forecast?No. It is only a math stress-test using the decline percentage you enter.

Formula

Stock loss = portfolio × stock exposure × market drop Other asset loss = portfolio × other exposure × other drop Recovery gain needed = loss ÷ remaining value

How to use current data

This calculator does not pull live stock index data. For the freshest estimate, enter the current market decline percentage you see from your brokerage, index chart, financial news source, or market app.

Example

If your portfolio is $100,000, 80% is exposed to stocks, and stocks drop 10%, the estimated loss is $8,000. Your remaining portfolio would be about $92,000 before any other asset changes. To recover from $92,000 back to $100,000, the portfolio would need to gain about 8.7%.

Scenario	Interpretation
Small pullback	5% drop in exposed assets; useful for mild volatility stress tests.
Correction	10% drop; often used to understand moderate market stress.
Bear-market stress	20% or more; use only as a scenario, not a prediction.
Cash buffer	Cash exposure can reduce portfolio-level drawdown but may also reduce upside.

Limitations

Real portfolios may include individual stocks, bonds, cash, funds, crypto, taxes, fees, dividends, rebalancing, withdrawals and deposits. This calculator simplifies those details into a broad exposure-based estimate.

Stock Market Drop Impact Calculator

Estimate market drop impact