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Crypto profit, computed honestly.

Every other profit calculator stops at proceeds minus cost. This one charges both fee legs the way an exchange does, shows your break-even, the sell price for any target, what happens across a whole range of prices, and the question the others dodge, what the taxman takes.

Fees, charged on each leg buy and sell
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The working

Three figures and the whole trade falls out.

  • How much you hold, or what you invested
  • The price you bought at
  • The price you are selling at

Runs on this page, nothing transmitted. Percentage fees are charged on each leg, the way exchanges charge them.

Now the tax on it, 2026 to 2027
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£3,000 a year
The estimate

The tax follows once there is a profit above and an income here.

  • A profit in the calculator above
  • Your annual income, which sets the rate band

An estimate for one disposal at 2026 to 2027 rates, 18% inside the basic rate band, 24% above, £3,000 allowance. Your real taxable gain follows the pooling rules below. Other years live in the CGT calculator, and the allowance tracker shows what you have left.

Now the truth other calculators skip.

The profit on one trade is not your UK taxable gain. HMRC matches every disposal against your acquisitions under strict rules, same day, the following 30 days, then your section 104 pool's average cost, so the taxable figure depends on your entire history, not this trade. Sold at a loss and bought back within a month? The loss probably is not what you think. The full app computes the real figure across every wallet and year, on your machine, with the rule named per disposal.

Compute my real gains

Quick questions.

How is crypto profit calculated
Sale proceeds minus purchase cost minus fees on both sides. This calculator shows profit, percentage return, the multiple on your money, your break-even price including fees, and the sell price you would need for any target, computed in your browser with nothing sent anywhere.
How do I work out profit if I only know what I invested
Switch the calculator to the amount-invested mode. Enter what you put in and the buy price, it derives your quantity and works everything else out from there.
How much tax will I pay on my crypto profit
Estimate it in the tax panel. UK Capital Gains Tax is 18% inside your basic rate band and 24% above it, after the £3,000 annual exempt amount for 2026 to 2027. The calculator splits your gain across the bands using your income and shows the effective rate.
Is my profit the same as my taxable gain
Usually not, and the difference costs people money. UK tax matches your disposal against acquisitions under the same-day, 30-day and section 104 pooling rules, so your taxable gain depends on your whole history, not one trade. The full app computes the real figure.
What is a break-even price in crypto
The sell price at which you get exactly your money back after fees on both sides. Selling above it is profit, below it is loss. Fees move it further from your buy price than most people expect, which is why this calculator includes them.
How do exchange fees affect my profit
Twice. A percentage fee is charged when you buy and again when you sell, so a 1% fee each side costs roughly 2% of the round trip. On a trade that gained 10%, fees at that level take a fifth of the profit.
Does this calculator send my numbers anywhere
No. It runs entirely on this page in your browser, nothing you type is transmitted or stored. Even the share link keeps your figures in the part of the URL that browsers never send to any server.
Can I share a calculation with someone
Yes, use the copy link button. Your inputs are encoded in the link fragment, the part after the # symbol, which stays on your device and theirs, it is never transmitted to a server, ours included.