DCA cost basis calculator
Model equal cash purchases at one assumed execution price, with trading fees deducted from each purchase budget.
Example assumptions. Inputs stay in this browser; no account connection or live data is used.
Your result
A CSV downloads only when you select the button.
How it works
Total cash = cash per purchase × purchases. Units = total cash × (1 − fee / 100) ÷ execution price. Average cost = total cash ÷ units.
Worked example
Twelve $100 purchases at an assumed $3,000 price and 0.1% fee spend $1,200, deduct $1.20 in fees, and acquire 0.3996 units. Average cost is $3,003.003 per unit.
Limits of this model
Every purchase uses the same assumed price; this is not a historical backtest or return forecast. Fees are charged from the cash budget in quote currency. It excludes taxes, spreads, withdrawals and sales. For actual cost basis, use each fill and your jurisdiction’s rules.