How to Use the Crypto Cost Averaging Calculator
When a coin you're holding drops, buying more to lower your average cost — averaging down — is a common move, and buying more into a rally (averaging up) is the flip side of the same math. This calculator takes your existing holdings and average cost, the quantity you're planning to add, and how far below or above your current average cost the new buy price is, then returns your new average cost and total position.
The math is a weighted average: (existing quantity × existing average cost + additional quantity × new buy price) divided by (existing quantity + additional quantity). Entering a negative percentage simulates buying below your average cost (averaging down), while a positive percentage simulates buying above it (averaging up) — so the same calculator covers both strategies.
A lower average cost doesn't eliminate downside risk. Averaging down means committing more capital to the position, so if the price keeps falling afterward, your total dollar loss can grow even as your average cost per coin drops. Only add to a position with money you can afford to have tied up, and consider position sizing before buying more into a decline.
Frequently Asked Questions
Enter how far below (negative, averaging down) or above (positive, averaging up) your existing average cost the new buy price is. For example, buying 20% below your average cost means entering -20.
Your average cost drops, but you've also put in more capital. If the price keeps falling after that, your total dollar loss can actually grow even though your average cost per coin is lower.