Stock Average Calculator
| Lot | Buy Price (₹) | Qty | Cost (₹) | Weight % |
What This Tool Does
When you buy shares of the same stock at different prices, your actual cost per share isn’t any single purchase price — it’s a weighted average. This calculator adds up your purchases and gives you that number instantly, so you know your true entry point before deciding to buy more or sell.
You can also use this eGFR Calculator.
How It’s Calculated
The average price of your holding is the total money spent divided by the total shares bought:
Average Price = (Total Amount Spent) ÷ (Total Shares Bought)
Written out for multiple purchases:
Average = ((Qty₁ × Price₁) + (Qty₂ × Price₂) + … + (Qtyₙ × Priceₙ)) ÷ (Qty₁ + Qty₂ + … + Qtyₙ)
Worked example: Say you buy 50 shares at ₹180, then later 75 shares at ₹210.
- Purchase 1: 50 × 180 = ₹9,000
- Purchase 2: 75 × 210 = ₹15,750
- Total spent: ₹24,750
- Total shares: 125
- Average price: 24,750 ÷ 125 = ₹198
That ₹198 is your break-even reference point per share — not what you paid either time, but what you effectively paid overall.
Edge Cases and Special Rules
- Brokerage and fees: Most simple averaging tools, including this one, use only the raw buy price and quantity — they don’t factor in brokerage, STT, or other transaction charges. Your actual cost basis may be slightly higher once fees are included.
- Rounding: Results are typically rounded to two decimal places, matching how prices are quoted.
- Partial sells: If you’ve already sold some shares before buying more, the average should be recalculated using only your current open quantity, not your full purchase history.
- Bonus shares or splits: A stock split or bonus issue changes your share count without new money spent, which lowers your average price mathematically — this tool doesn’t auto-adjust for that, so factor it in separately.
Who Uses This
- Investors averaging down after a price drop, to see their new break-even point
- Traders comparing several buy-in points before deciding on an exit price
- Anyone tracking a staggered or SIP-style stock purchase plan across weeks or months
- Investors checking their numbers against what their trading app or broker statement shows
Whether you place orders through Zerodha, Groww, Upstox, Angel One, or Dhan, the math behind the average price is the same — this tool just does it independently of any single platform.
Average Price vs. Break-Even Price
These sound similar but aren’t identical. Average price is purely the weighted cost of your shares. Break-even price is what you’d need to sell at to cover that cost plus any brokerage, taxes, or fees paid along the way. If costs are low, the two numbers are close; if fees are significant, break-even will sit a bit above your average price.
FAQ
What is a stock average calculator?
A tool that works out your weighted average buy price after purchasing the same stock at different prices.
Why does average price matter?
It tells you your true cost per share, which is more useful for decision-making than any single purchase price.
Does it include brokerage charges?
No — this calculates the average of buy price and quantity only. Add fees separately for your exact cost basis.
Can I use it for more than two purchases?
Yes. Add each purchase and quantity, and the calculator will weight all of them together.
Is this the same as an SIP calculator?
No. An SIP calculator projects returns on regular fixed investments over time; this tool averages actual share purchases you’ve already made.
Try It Above
Enter your purchase prices and quantities in the calculator above to get your average instantly. Results are for general informational purposes only and don’t account for brokerage, taxes, or other charges — always verify against your broker’s statement before making investment decisions.