Total quantity 300 · Total investment ₹78,000 · Weighted average ₹260
Finance
Stock Average Price Calculator
Calculate a weighted average purchase price or plan how much to buy to reach a lower target average.
Free to use No account required Browser calculation
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Input
ReadyEnter your values
Enter the values for this calculator. We’ll show the answer, the method and the formula together.
Calculation method
Formula & methodology
The result above is backed by the calculator-specific formulas and assumptions shown here.
Weighted average price
Σ(Quantity × Purchase price) ÷ Σ QuantityRequired quantity for target average
q = Current quantity × (Current average − Target average) ÷ (Target average − New purchase price)The target-average planner is scoped to averaging down, where New purchase price < Target average < Current average.
Method & assumptions
Each purchase contributes according to its quantity, so the calculator uses a weighted average rather than a simple average of the entered prices.
Lot cost is calculated as quantity × purchase price, total investment is the sum of all lot costs, and weighted average price is total investment ÷ total quantity.
The target-average planner solves the weighted-average equation for the unknown additional quantity without rounding intermediate values.
When an exact required quantity is fractional, the calculator also shows a whole-share rounded-up illustration using ceil(required quantity).
Brokerage, STT, exchange charges, taxes and capital-gains treatment are intentionally excluded from this calculator.
Important assumption
This calculator does not recommend whether you should enter, exit or average a position.
Examples
Worked examples
Examples use this calculator’s own inputs and outputs, not generic page filler.
Buy 100 additional units for ₹20,000 · Resulting average ₹250
Help & assumptions
Frequently asked questions
Important assumptions and practical details for this calculator.
Why is a weighted average different from a simple average?+
A simple average gives every entered price equal weight. A stock average must account for how many units were bought at each price, so larger purchases affect the result more.
Why does quantity matter when calculating my average price?+
Your cost basis is the sum of quantity × price for every purchase. The final average is that total cost divided by the total quantity held.
What does the target-average planner calculate?+
It estimates the additional quantity required at a proposed lower purchase price to reach a chosen lower average, then verifies the resulting weighted average.
Why can a target average be unreachable?+
For this averaging-down planner, the new purchase price must be below the target average, and the target average must be below the current average. If that relationship is not satisfied, buying a non-negative quantity cannot produce the requested result within this mode.
Does this include brokerage, STT, taxes or capital gains?+
No. This version calculates acquisition-price averages only. Brokerage, STT, exchange charges, taxes and capital-gains treatment are outside its scope.
Does the calculator tell me whether averaging down is a good idea?+
No. It performs arithmetic only and does not recommend whether you should enter, exit or average a position.
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