Stock Average Calculator
Average cost after buying more shares.
Reviewed by the Calculation Machine team · How we check our maths
Your values
ⓘ Live results
Results
- New average cost
- $38.66
- Total shares
- 250
- Total invested
- $9,665.00
- Current value
- $9,100.00
- Unrealised P/L
- -$565.00 (-5.85%)
- Break-even price
- $38.66
Working
- 1Avg = (100×$48.50 + 150×$32.10) ÷ 250 = $38.66
Quick answer
Average cost is total money spent divided by total shares held across all purchases.
The formula
Avg = (q₁p₁ + q₂p₂) ÷ (q₁ + q₂)
Worked example
Worked example
Using the values the calculator loads with.
Inputs
- First purchase shares100
- First purchase price48.50 $
- Second purchase shares150
- Second purchase price32.10 $
- Current price36.40 $
Result
- New average cost$38.66
- Total shares250
- Total invested$9,665.00
- Current value$9,100.00
- Unrealised P/L-$565.00 (-5.85%)
- Break-even price$38.66
How to use the Stock Average Calculator
- 1Enter your first purchase quantity and price.
- 2Enter the second purchase.
- 3Add the current price to see unrealised profit.
Frequently asked questions
Is averaging down a good idea?
Only if your thesis still holds. Adding to a losing position purely to lower the average is how small losses become large ones.
Do fees count in cost basis?
Yes — include commissions in the purchase price for accurate tax reporting.
About this calculator
- Built and reviewed by the Calculation Machine team · How we build and test calculators
- Report an error