Stock averaging
Target Average Calculator
Find how many additional shares you need to buy to reach a desired average price.
Global calculator · Select the currency used for your inputs. No exchange-rate conversion is applied.
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Target Average Calculator formula
The equation solves for the extra quantity required at the proposed purchase price. A target below the proposed purchase price, or above the current average when averaging down, cannot be reached by that purchase.
How to interpret the result
Treat the required quantity and investment as scenario inputs—not a suggestion to increase exposure. Compare the resulting position size with your risk limits before making a decision.
Worked example
For 100 shares averaging 120, buying at 90 to target 105 requires 100 additional shares.
How to use this calculator
- Enter values from the same transaction or scenario.
- Confirm that quantities, dates, rates and currency match the labels.
- Review the result and change one assumption at a time when comparing scenarios.
Common mistakes
- Using a simple average instead of weighting each purchase by quantity.
- Choosing a target that cannot be reached at the proposed purchase price.
- Ignoring brokerage, taxes and the larger concentration created by another purchase.
Limitations
The result assumes one additional purchase at one price and excludes execution slippage, fees, taxes and subsequent market movement.
Learn how weighted average share price works →
This calculator is for general education and estimation only. It is not financial, tax, accounting, or investment advice.
Questions to check before relying on the result
What does this calculator include?
Find how many additional shares you need to buy to reach a desired average price.
Which assumptions should I verify?
Check every entered amount, rate, date and charge against the transaction, official source or provider document relevant to you.
What can make the actual outcome different?
The result assumes one additional purchase at one price and excludes execution slippage, fees, taxes and subsequent market movement.
Does the selected currency convert my values?
No. Currency selection changes formatting only; it does not fetch or apply an exchange rate.