Average share purchase cost calculator UK
Combine two share purchases and their dealing fees into a weighted average cost. Check the formula, worked example and limits before using your own figures.
Enter your figures
Average cost per share
Inputs changed. Select Calculate result to update your estimate.
Use your actual figures. Any prefilled price, fee, rate or return is an editable illustration, not a current product quote. A two-purchase cost average, not the HMRC share-pooling, same-day or 30-day matching calculation for Capital Gains Tax.
How the average share purchase cost calculator uk works
Average unit cost = (first cost + second cost + fees) ÷ total shares.
Data basis: mathematical formula using your inputs. Example prices and rates are illustrative, not current market quotes.
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Worked example: average share purchase cost
This illustration uses the calculator’s example inputs. It is not a quote or a recommended financial decision.
- Shares in first purchase
- 100
- First price per share (£)
- 5
- Shares in second purchase
- 150
- Second price per share (£)
- 6
- Total purchase fees (£)
- 10
Average cost per share: £5.64
Average unit cost = (first cost + second cost + fees) ÷ total shares.
Average share purchase cost: questions answered
What does the average share purchase cost calculation include?
Average unit cost = (first cost + second cost + fees) ÷ total shares. Use your actual figures. Any prefilled price, fee, rate or return is an editable illustration, not a current product quote. A two-purchase cost average, not the HMRC share-pooling, same-day or 30-day matching calculation for Capital Gains Tax.
Using your result
Example inputs are a starting point. Replace them with your figures and select Calculate result. Results are rounded for display; calculations use unrounded values.
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