Average Share Price Calculator
Calculate average stock purchase price
How the Average Share Price Calculator Works
The Average Share Price Calculator helps investors determine the weighted average cost per share when they have made multiple purchases of the same stock at different prices. Whether you are building a position over time through dollar cost averaging or adding to a holding during market dips, knowing your true average cost is essential for tracking investment performance.
Simply enter the number of shares and the price per share for each purchase. The calculator multiplies each purchase's shares by its price to get the total cost, sums all costs and shares, then divides the total investment by the total number of shares to produce your average price.
Formula
Average Price = Total Investment / Total Shares
For example, if you purchased 100 shares at $50 (= $5,000) and later bought 200 shares at $60 (= $12,000), your total investment is $17,000 for 300 shares. The average share price is $17,000 ÷ 300 = $56.67 per share.
Understanding Cost Basis and Dollar Cost Averaging
Your cost basis is the original value of a stock for tax purposes, typically the purchase price plus any commissions or fees. When you sell shares, the difference between the sale price and your cost basis determines your capital gain or loss. The IRS allows several methods for calculating cost basis, including average cost, FIFO (first in, first out), and specific identification.
Dollar cost averaging (DCA) is a popular investment strategy where you invest a fixed dollar amount at regular intervals, regardless of the share price. This disciplined approach helps smooth out the effects of market volatility — you automatically buy more shares when prices are low and fewer shares when prices are high, which can result in a lower average cost per share over the long term.
Tracking your average share price allows you to see at a glance whether your position is currently profitable. If the market price is above your average cost, you are in a gain; if below, you are in a loss. This insight is critical for making informed decisions about when to add to your position, take profits, or cut losses.
Frequently Asked Questions
Related tools: ROI Calculator for measuring investment returns, Compound Interest Calculator for growth projections, or Tax Calculator for estimating capital gains tax.
This calculator is for informational purposes only and does not constitute financial advice.
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