How to calculate your average crypto cost
Enter the price you paid and the amount of money you spent for each buy. The calculator converts every buy into coins, adds them up, and divides your total spend by your total coins to give your average cost per coin. Add a row for each purchase — leave a row blank to ignore it.
The formula
Coins per buy = Amount ÷ Price · Average cost = Total amount ÷ Total coins
Worked example
Two buys of $100 each — one at $50,000, one at $40,000:
- Coins: $100 ÷ $50,000 = 0.002, plus $100 ÷ $40,000 = 0.0025 → 0.0045 coins
- Total invested: $200
- Average cost: $200 ÷ 0.0045 = ≈ $44,444 per coin
What is averaging down?
Averaging down means buying more after the price falls, which lowers your average entry and the price you need to break even. In the example, a second buy at $40,000 pulled the average from $50,000 down to about $44,444. The trade-off: you're adding to a position that is losing — so it raises your stake and your risk if the price keeps dropping.
Common mistakes to avoid
Mixing up coin quantity with dollars spent. Forgetting trading fees, which slightly raise your true cost. Averaging down purely because a coin is "cheaper" without a plan — a falling price is not by itself a reason to buy. Only risk what you can afford to lose.
Frequently asked questions
$100 at $50k and $100 at $40k — what's my average?
You hold 0.0045 coins for $200, so your average cost is about $44,444 per coin.
What does averaging down do?
It lowers your average entry price by adding buys at lower prices — but increases your position in a falling asset.
Do I enter coins or dollars?
Enter the price and the dollars spent. The tool works out the coins for you.
Does it include fees?
No. Add fees to the amount spent if you want your true cost basis.
Is my data saved?
No. Everything runs in your browser; nothing is uploaded.