Working out your average cost in BTC
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 78,400 USDT reference price by default — use the live-price button to refresh it.
BTC average cost formulas
amount of buy i ÷ price of buy isum of coins from every buytotal invested ÷ coins heldcoins held × current price − total investedWorked BTC scaling-in example
Buying 500 USDT at 70,560 USDT and 500 USDT at 86,240 USDT means 1,000 USDT invested for about 0.012884 BTC at an average cost near 77,616 USDT. At the 78,400 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 @ 70,560 + 500 @ 86,240 | 1,000 USDT | 0.012884 | 77,616 | 10.1 USDT |
| 600 @ 62,720 + 400 @ 94,080 | 1,000 USDT | 0.013818 | 72,369.23 | 83.33 USDT |
| 1,000 @ 78,400 | 1,000 USDT | 0.012755 | 78,400 | 0 USDT |
Average cost = total invested ÷ coins held; floating P&L uses the 78,400 USDT reference price, fees excluded.
The limit of averaging down in BTC
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 BTC position safe.
FAQ
How do I average the cost of several BTC buys?
Average cost = total invested ÷ coins held, where coins held is the sum of each amount ÷ price. Two 500 USDT buys at 70,560 and 86,240 USDT average about 77,616 USDT, not the simple midpoint 78,400 USDT.
How much am I down after scaling into BTC?
Floating P&L = coins held × current price − total invested. At the 78,400 USDT reference price the two-leg example above shows about 10.1 USDT; below the average cost it turns negative.