Calculators
Last reviewed November 1, 2026
Two everyday calculators. Everything is worked out in your browser and nothing is sent anywhere.
Converter: BTC, satoshi, ETH, gwei
Type a value into any box and its counterpart updates straight away.
1 BTC = 100,000,000 satoshis. 1 ETH = 1,000,000,000 gwei.
Average cost and gain
Enter the amount you spent and the price for each purchase. Add the current price to see your gain or loss.
- Total spent
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- Coins held
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- Average cost
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- Current value
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- Gain/loss
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- Gain/loss %
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Fees are not included. Tax rules may calculate cost differently, for example UK share pooling.
Average cost shows what each coin cost you on average when you bought at different times, for instance through dollar-cost averaging. It gives a quick read on whether your position as a whole is up or down.