Stock Average Down Calculator

The stock averaging calculator helps you understand how your average cost basis changes after additional purchases during price drops. Enter your current holdings and planned purchases to instantly see your new average price and break-even point.

edit_noteEnter Positions

Enter your holdings and planned purchases.

Initial Position
#1
$
shares
Add Position
#2
$
shares
trending_up

Enter your positions

Enter price and quantity on the left to calculate your average cost.

helpHow to Use the Stock Average Calculator

1

Enter Your Position

Input the purchase price and number of shares for your current holdings.

2

Plan Additional Buys

Add the price level and quantity you plan to average down at to simulate the outcome.

3

Review the Results

Instantly see your new average cost basis, total investment, and break-even change.

4

Export Your Report

Save your portfolio simulation as a PDF or image for your investment journal.

4 Key Points Before Averaging Down

query_stats

Fundamental Check

Analyze whether the price drop is temporary or reflects permanent damage to business value.

do_not_disturb_on

Stop Loss Line

Set maximum allowable loss at -10% to -15% and prepare mechanical responses.

pie_chart_outline

Asset Allocation

Split purchases into 3-5 tranches within 30% of total capital to reduce risk.

target

Target Price

Simulate if your new average falls within the technical rebound zone.

schoolWhat Is Averaging Down?

Averaging down means buying additional shares of a stock after its price has fallen, thereby lowering your average cost per share. For example, if you bought 100 shares at $50 and the price drops to $40, purchasing another 100 shares brings your average cost to $45. This differs from Dollar Cost Averaging (DCA), which invests a fixed amount at regular intervals regardless of price.

The opposite strategy is "Averaging Up" — buying more shares as the price rises to ride momentum. While it can amplify gains in an uptrend, it also raises your average cost, increasing downside risk if the trend reverses.

compare_arrowsDecision Matrix

Scale In (Average Down)

  • Strong fundamentals intact
  • Macro-driven temporary sell-off
  • RSI in oversold territory

Cut Loss

  • Business model damaged
  • Accounting fraud discovered
  • Better opportunities elsewhere

trending_up2026 Investment Tactics

rocket_launchGrowthAI & Semiconductors
-20% Scale-in Zone
savingsDividendYield 5%+
Cash Flow Strategy
insert_chartETFS&P 500 ETF
Risk Hedging
* These are general guidelines and do not constitute individual investment advice.

FAQ

A stock average cost calculator helps you calculate the average price per share after buying the same stock multiple times at different prices.
Dollar cost averaging (DCA) is an investment strategy. This calculator helps you calculate the average cost resulting from a DCA strategy.
Yes. The average cost formula works the same for stocks, ETFs, and cryptocurrencies.
No. This calculator focuses on average share price only. Brokerage fees and taxes may affect your actual results.
If you increase your share count through averaging down, it can affect your future dividend income for dividend-paying stocks or ETFs. You can use the US Stock Dividend Calculator together to estimate your expected dividend income after averaging down.
Your average cost changes because each purchase adds a new price and quantity to your total investment, affecting the overall average.
Click the 'Save' button after entering your purchase history to store it in your browser. You can add a title to distinguish multiple stocks. Select from the 'Load' dropdown to restore previous entries. Up to 10 saves are allowed, and data is stored locally only - not on any server - keeping your information private.
Click the '+ Add Purchase' button to add a new purchase row. Click the X button on the right side of each row to delete it. At least one row is always maintained. Add as many rows as needed to calculate multiple purchases at once.

More Investment Calculators

Dividend Calculator

Calculate expected annual and monthly dividend income based on your holdings and yield.

계산하기 →

Investment Calculator

Project compound growth of your investments over time with different contribution strategies.

계산하기 →

Currency Calculator

Convert between 160+ currencies with real-time exchange rates.

계산하기 →
info

This calculator is a reference tool to assist investment decisions and may differ from actual results. All investment risks are borne by the investor.