Crypto calculator & converter

How to use the calculator

It's deliberately simple. Type the amount you're thinking about, choose what you're converting from and to, and the answer updates as you type. Hit the swap button to flip the direction — handy when you catch yourself converting the wrong way round. You can go crypto-to-fiat (how many pounds is 0.5 ETH?), fiat-to-crypto (how much BTC does £250 buy?), or crypto-to-crypto (how much SOL for 1 ETH?).

What makes a converter genuinely useful isn't the arithmetic — any tool can multiply. It's understanding the gap between this clean figure and the number that leaves your account. Let's close that gap.

From "clean number" to "real cost" in three subtractions

The calculator gives you the raw market maths. Reality adds three deductions, and once you know them you'll never be surprised by a receipt again:

A good rule for a rough estimate: take the calculator's figure and knock off 0.5–2% for the round trip on a mainstream exchange. If your real cost is worse than that, you're probably using the wrong buy button or the wrong network.

Worked examples

Buying with a budget

You have £300 and want Ethereum. The calculator says that's roughly a certain amount of ETH at the reference rate. In reality, on a spot market with a 0.1% fee and a tight spread you'll get very close to that; on a one-tap buy with a 1.5% spread you'll get noticeably less. Same £300, and the difference is real ETH you either own or don't.

Cashing out

Going the other way, you're converting crypto back to fiat. Here the withdrawal to your bank and any conversion margin matter most. The calculator tells you the theoretical value; your actual payout depends on the off-ramp fee and the FX rate, which is why comparing exchanges on cash-out cost — not just buy cost — is worth doing.

Sizing a stablecoin transfer

Moving USDT between platforms? The conversion is trivial (it's ~$1), but the network fee isn't. The calculator confirms the value; the network choice — Tron and Solana cheap, Ethereum expensive — decides how much of it survives the trip.

Why the rates here are fixed

This tool uses reference rates rather than a live feed, and that's a deliberate trade-off. Fixed rates mean the calculator loads instantly, works even with a flaky connection, and never leaks what you're calculating to any server. The cost is precision: these numbers drift from the live market minute by minute. For "roughly how much?" planning they're ideal. For the exact figure at the moment you press buy, look at the live quote on the official app and on the exchange. Never treat a calculator — any calculator — as the price you'll fill at.

Conversions people search for most

Certain conversions come up again and again, usually at the exact moment someone is about to buy or cash out. Here's how to think about the common ones — the calculator handles the maths, but the context is what stops mistakes.

• BTC to GBP / EUR / USD. The classic "what's my Bitcoin worth?" check. Remember the fiat spread: a great BTC/USD rate can become a mediocre BTC/GBP one once currency conversion is added, so convert in the currency you'll actually receive.
• ETH to BTC. A ratio traders watch to gauge whether Ethereum is gaining or losing ground against Bitcoin. Useful as a market signal, not just a number.
• USDT / USDC to fiat. Since stablecoins track the dollar, the conversion is nearly 1:1 to USD — the real variable is the off-ramp fee and the FX rate to your home currency.
• Fiat to SOL / small-cap coins. Here slippage bites hardest. The calculator's clean figure assumes deep liquidity; on a thin market your real fill can be noticeably worse.

How volatility changes your estimate

A calculator gives you a snapshot, and crypto rarely holds still long enough for a snapshot to stay accurate. During calm periods, the figure you see now and the figure at the moment you press buy might differ by a fraction of a percent. During a volatile stretch — a big news event, a market-wide sell-off — the same coin can move several percent in minutes. That's not the calculator being wrong; it's the market being fast.

The practical defence is to treat any conversion as a range, not a precise promise. If you're buying £500 of a volatile coin, mentally allow that you might get 1–3% more or less than the headline figure by the time your order fills. If a couple of percent either way would genuinely upset you, that's a signal about position size, not about the tool.

Dollar-cost averaging: the maths that favours patience

One of the most common uses for a converter is planning a recurring buy — putting a fixed amount in every week or month rather than a lump sum. The appeal is mathematical, not magical: buying the same fiat amount regularly means you automatically buy more coins when the price is low and fewer when it's high, which smooths out your average entry price and removes the impossible pressure of timing the market. Use the calculator to see how a fixed £50 or £100 translates into coins at today's rate, then repeat the exercise whenever the price moves to watch your average settle over time. It won't guarantee a profit — nothing does — but it's a discipline that spares beginners the worst timing mistakes.

Keeping records for tax

Boring but important: in many countries, converting crypto — even crypto-to-crypto — can be a taxable event, and the figure you'll eventually need is the value in your home currency at the moment of each transaction. A calculator is a handy way to reconstruct or sanity-check those values, but it's not a substitute for proper records. Note the date, the amount, the coins involved and the fiat value at the time of every meaningful transaction. Your future self, filing a tax return, will thank you. None of this is tax advice — rules vary widely, so check your local regulations or a qualified professional.

Conversion price vs execution price

The most important idea a calculator can teach is that there are two different prices, and only one of them is real to you. The conversion price is what a rate calculator shows: a clean, mid-market figure that says "one BTC equals roughly this many pounds." The execution price is what you actually get when you trade: the conversion price adjusted for the spread, the fee, and — for anything but a small order — slippage as your order eats into the book. The calculator gives you the first; the exchange gives you the second. Most beginner disappointment ("I thought I'd get more!") is simply the gap between the two, and once you expect that gap you'll never be blindsided by it. Use the conversion price to plan and the live order book to execute.

A note on fiat and rounding

Two small details cause outsized confusion. First, fiat conversion: if you're pricing in pounds or euros but the coin trades mainly against the US dollar, there's a currency conversion layered on top, and it carries its own small spread. A calculator that converts cleanly through the dollar won't show you that FX margin — the exchange will. Second, rounding: crypto is divisible to tiny fractions, and rounding a figure to two decimals can quietly misplace real value on high-priced coins. That's why this calculator keeps extra decimal places rather than tidying them away. When you're checking a large amount, look at the full precision, not the rounded headline — those trailing digits are your money too.

Sanity-checking a suspicious number

A converter is also a fraud-detector if you let it. Scams frequently hinge on victims not doing simple maths: a "doubling" scheme, a "guaranteed" return, a token priced to imply a market cap larger than entire economies. Before you act on any crypto number someone else put in front of you, run it through a calculator and a moment of arithmetic. Does the implied market cap make sense against the supply? Does the promised return survive contact with reality? Would this transfer's network fee eat the whole gain? The habit of checking the maths yourself, rather than trusting a screenshot, is one of the cheapest forms of protection in all of crypto — and a plain converter is often all the tool you need.