Working out your average cost in ETH
Log each buy with its amount and price; the tool totals the invested capital, coins held and average cost, then values the position at a current price you provide.
Floating P&L is estimated at the 2,471 USDT reference price by default — use the live-price button to refresh it.
ETH average cost formulas
amount of buy i ÷ price of buy isum of coins from every buytotal invested ÷ coins heldcoins held × current price − total investedWorked ETH scaling-in example
Buying 500 USDT at 2,223.9 USDT and 500 USDT at 2,718.1 USDT means 1,000 USDT invested for about 0.408782 ETH at an average cost near 2,446.29 USDT. At the 2,471 USDT reference price the position shows about 10.1 USDT.
Average cost example table
| Buy legs | Total invested | Coins held | Average cost | Floating P&L at reference price |
|---|---|---|---|---|
| 500 @ 2,223.9 + 500 @ 2,718.1 | 1,000 USDT | 0.408782 | 2,446.29 | 10.1 USDT |
| 600 @ 1,976.8 + 400 @ 2,965.2 | 1,000 USDT | 0.438419 | 2,280.92 | 83.33 USDT |
| 1,000 @ 2,471 | 1,000 USDT | 0.404694 | 2,471 | -0 USDT |
Average cost = total invested ÷ coins held; floating P&L uses the 2,471 USDT reference price, fees excluded.
The limit of averaging down in ETH
Buying lower does reduce your average cost, but it also increases position size and total risk. Average cost is an accounting number — it does not make a losing ETH position safe.
FAQ
How do I average the cost of several ETH buys?
Average cost = total invested ÷ coins held, where coins held is the sum of each amount ÷ price. Two 500 USDT buys at 2,223.9 and 2,718.1 USDT average about 2,446.29 USDT, not the simple midpoint 2,471 USDT.
How much am I down after scaling into ETH?
Floating P&L = coins held × current price − total invested. At the 2,471 USDT reference price the two-leg example above shows about 10.1 USDT; below the average cost it turns negative.