How do you calculate stock average down (cost basis)?

Divide your total investment amount (initial shares × initial buy price + new shares × new buy price) by your total number of shares. Our calculator automatically includes trading commissions and calculates your exact break-even price (BEP) and required bounce percentage.

How do I plan a scale-out exit strategy?

Click [Import Current Avg] in the Scale-Out tab, then enter your target exit prices and share percentages (10%, 25%, 33%, 50%, or 1-click 3-step/4-step presets) to see net realized profit and remaining shares instantly.

Stock Average Down Calculator | Cost Basis, DCA, Target Profit & Scale-Out

Average Down

Unlimited Tranches · Auto-Saved

Final Average Cost (Cost Basis) 0

Total Shares / Coins 0

Total Invested Capital 0

Include Trading Fees (Updates Break-Even & Net Profit)

🎯 Target Average Reverse Calculator (How many more shares?) Based on current holdings

Desired Target Avg ($)

Current Dip Buy Price ($)

Enter your Desired Avg and Current Buy Price to calculate required shares.

📲 Cross-Device Sync (Phone ↔ PC Backup) & Share Link

1. Current Position

Average Buy Price ($)

Total Shares / Units

2. Scale-Out Exit Tranches Unlimited Exit Targets

Total Realized Net Profit $ 0.00

Average Exit ROI +0.00%

Total Cash Recovered $ 0.00

Remaining Shares / Remaining Cost Basis 0 sh ($ 0.00)

⚡ 1-Click Pro Scale-Out Presets

📊 Stock Average Down Calculator (Cost Basis & DCA) & Break-Even Guide

Use our free Stock Average Down & Crypto DCA Calculator to calculate your exact cost basis across unlimited buy tranches, see how much your break-even bounce requirement drops, and plan your scale-out profit targets. All tickers are automatically saved in your browser.

📚 [Cheat Sheet] Drawdown Recovery Math (-10% to -90%) & Average Down FormulaExpand ▾

📉 1. Why Averaging Down Works: Drawdown vs. Required Gain to Break Even

When a stock drops, the percentage gain required to get back to break-even increases exponentially. Averaging down (DCA) lowers your cost basis so a much smaller rebound gets you back in profit.

Current Loss	-10%	-20%	-30%	-50%	-70%	-80%	-90%
Gain Needed (No DCA)	+11.1%	+25.0%	+42.9%	+100.0%	+233.3%	+400.0%	+900.0%
After Equal $ DCA	+5.3%	+11.1%	+17.6%	+33.3%	+53.8%	+66.7%	+81.8%

Q. What is the Stock Average Down (Cost Basis) Formula?

Average Cost = Total Dollar Amount Invested ÷ Total Shares Owned. If you bought 100 shares at $100 ($10,000) and average down with another 100 shares at $60 ($6,000), your new cost basis is $16,000 ÷ 200 = $80.00 per share, reducing your break-even rebound requirement from +66.7% to just +33.3%.