# Stock Average Calculator (Average Cost)

URL: https://speedycalculator.com/calculators/finance/stock-average/
Last updated: 2026-10-25

> The stock average calculator works out the average price you paid per share across several purchases – your cost basis – the total invested, and your profit or loss at the current price.

## Inputs

- Shares bought in each purchase
- Price paid in each purchase
- Current stock price

## Results

- Average price per share
- Total shares
- Total invested
- Current value
- Unrealised profit or loss
- Return

## Formula

```
Average price = Σ (shares × price) ÷ Σ shares
Unrealised profit = (current price − average price) × total shares
```

## Explanation

Averaging down – buying more after a price fall – lowers your average cost, so a smaller recovery is needed to break even. It only helps if the company's prospects are still sound.

### How to use the Stock Average Calculator

- **Shares bought in each purchase**
- **Price paid in each purchase**
- **Current stock price**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter the number of shares and the price of each purchase (in the same order), and the current price.

### Tips

- Take figures from the same financial statements and the same fiscal year.
- Compare ratios with companies in the same industry, not across industries.
- Use several valuation measures together; no single ratio tells the whole story.
- Market prices change every second – refresh the share price before you rely on a result.

### Common mistakes to avoid

- Mixing per-share figures with company totals.
- Using trailing earnings for one company and forward earnings for another.
- Forgetting dilution from options and convertible securities.

### Inputs explained

FieldWhat to enterShares bought in each purchaseA list of numbers separated by commas, spaces or new linesPrice paid in each purchaseA list of numbers separated by commas, spaces or new linesCurrent stock priceAmount in your currency

### What each result means

- **Average price per share** = dot([Shares bought in each purchase], [Price paid in each purchase])÷sum([Shares bought in each purchase])
- **Total shares** = sum([Shares bought in each purchase])
- **Total invested** = dot([Shares bought in each purchase], [Price paid in each purchase])
- **Current value** = sum([Shares bought in each purchase])×[Current stock price]
- **Unrealised profit or loss** = [Current value] - [Total invested]
- **Return** = [Unrealised profit or loss]÷[Total invested]×100

### Example values

How the main result changes when **Current stock price** changes and everything else stays at the example values above:

Current stock priceAverage price per share52103.0878103.08104103.08130103.08156103.08208103.08

## Worked example

Inputs — Shares bought in each purchase: 50, 30, 40; Price paid in each purchase: 120, 95, 88; Current stock price: $104.

Results — **Average price per share = $103.08**; Total shares = 120; Total invested = $12,370.00; Current value = $12,480.00; Unrealised profit or loss = $110.00; Return = 0.89 %.

## FAQ

**How do I calculate my average stock price?**
Total amount paid ÷ total shares bought.

**Should I include commissions?**
Yes, for an accurate cost basis.

**Does averaging down work?**
Only if the stock recovers; it also increases your exposure.

**What formula does the Stock Average Calculator use?**
Average price = Σ (shares × price) ÷ Σ shares.