How do you calculate average stock price?

To calculate your average stock price, multiply the number of shares in each lot by the price paid per share (plus any fees), add up all those costs, then divide by the total number of shares you own. The result is a weighted average price per share.

Does this calculator include brokerage fees?

Yes. You can enter optional trade fees for each lot. The calculator adds fee amounts to the cost of each purchase, so your average buy price reflects the true cost per share including commissions.

Can I see unrealized profit or loss?

Yes. If you enter a current market price, the calculator shows your total market value, unrealized profit or loss and percentage return compared to your total invested amount.

Stock Average Calculator — Average Down Your Buy Price

Average buy price per share

—

Total shares

—

Sum of shares across all lots.

Total cost

—

Includes any fees entered for each lot.

Market value

—

Based on current price if provided.

Unrealized P/L

—

Position summary

Enter at least one lot with shares and price to see your weighted average buy price, total invested amount and, if you add a current price, unrealized profit or loss.

Average price per share: —
Break-even price: —
Total fees included: —

How this stock average calculator works

When you buy the same stock multiple times, each purchase may have a different price and fee. This calculator computes your weighted average buy price so you can see the true cost per share across all lots combined.

For each lot, we calculate:

Lot cost = shares × price per share + fees

Then we add everything together:

Total shares     = sum of shares for all lots
Total cost       = sum of lot costs (including fees)
Average price    = Total cost ÷ Total shares

If you enter a current market price, the calculator also shows market value and unrealized profit or loss:

Market value     = Total shares × current price
Unrealized P/L   = Market value − Total cost
Return %         = Unrealized P/L ÷ Total cost

Example: averaging down your stock position

Suppose you buy a stock three times:

Lot 1: 50 shares at $20.00
Lot 2: 50 shares at $16.00
Lot 3: 100 shares at $14.00

Ignoring fees for simplicity:

Total shares  = 50 + 50 + 100 = 200
Total cost    = (50 × 20) + (50 × 16) + (100 × 14)
              = 1,000 + 800 + 1,400
              = 3,200

Average price = 3,200 ÷ 200
              = 16.00

Your average buy price is now $16.00 per share. If the current market price rises above $16, you are in profit overall, even though your first lot was at $20.

Why fees matter for your true average price

Brokerage commissions, exchange fees and transaction taxes all increase the real cost of buying shares. Ignoring them can make your average price look lower than it actually is.

In this calculator, each lot has its own optional fee field. These fees are added to the lot cost before the average price is computed, so your result reflects a more realistic break-even level.

Tips for using the stock average calculator

Only fill in the lots you actually used – leave the rest blank.
Use the same currency for all prices and fees.
Include both buy commissions and any per-trade taxes as fees.
Update the current price occasionally to track unrealized profit or loss.

Frequently asked questions

Does this work for fractional shares?

Yes. You can enter decimal numbers for both shares and prices. Many brokers now allow fractional share purchases, and the calculator supports that.

Is this the same as “dollar-cost averaging”?

The idea is related. Dollar-cost averaging is an investing strategy where you invest a fixed amount regularly. The calculator simply shows the resulting average price per share of the trades you enter, whatever strategy you used.

Can I use this for ETFs and crypto?

Yes. As long as you have trades with shares/units, prices and fees, the math is the same — the tool doesn’t care whether it’s a stock, ETF or token.

Stock Average Calculator

Average stock price results