TRADING & RISK
Average Purchase Price Calculator
Combine purchases at different prices into a weighted average cost.
Your result
Loading calculator…
How to use this calculator
Adjust the inputs to your own scenario, then review the result alongside the assumptions below. The $ symbol is a currency label; the tool does not convert exchange rates.
Worked example
10 shares at $100 and 20 at $90, with $1 fee on each purchase, give $2,802 total basis and $93.40 per share.
The formula
Average cost per share = sum(shares × price + costs) ÷ total shares.
What the result means
Compare the output with the stated assumptions. Changing an input changes the arithmetic; it does not establish how a real trade or investment will perform.
Assumptions and limitations
This is arithmetic purchase averaging, not jurisdiction-specific tax cost-basis accounting. Excludes sells, splits, and currency conversion.
Common questions
What does this calculation include?
This is arithmetic purchase averaging, not jurisdiction-specific tax cost-basis accounting. Excludes sells, splits, and currency conversion.
Are the example inputs recommendations?
No. The defaults are worked examples. Enter values appropriate to your own calculation; outputs are estimates rather than forecasts.
Put your trading rules to the test
Explore supported daily stock rules, then review historical trades, drawdowns, and the report’s assumptions.
Related calculators
Trading & Risk
Position Size Calculator
Estimate whole-share position size from your account balance, risk budget, entry price, and stop price.
Open calculator →Trading & Risk
Risk/Reward & Break-Even Win Rate Calculator
Compare a planned target with a planned stop and find the win rate needed to break even under those assumptions.
Open calculator →Trading & Risk
Drawdown Recovery Calculator
See how much an account must gain to recover after a percentage loss. The recovery percentage is larger than the loss percentage.
Open calculator →Trading & Risk
Trading Costs Calculator
Estimate the combined drag from fixed commissions, percentage fees, and slippage over a set of round-trip trades.
Open calculator →Trading & Risk
Trade Expectancy Calculator
Combine your win rate, average winning trade, average losing trade, and costs to estimate the average P/L per trade.
Open calculator →Trading & Risk
Stock Profit/Loss Calculator
Calculate a long or short stock trade’s gross and net result.
Open calculator →Educational calculations, not a forecast or personalized investment advice. Your inputs are used locally for the calculation and are not submitted by this tool.