Cryptocurrency Converter
Convert between cryptocurrencies, or between a coin and fiat money, using prices you enter yourself.
Enter the current price of BTC and ETH in USD to see the conversion.
This converter has no built-in prices and does not fetch live quotes. Results are only as current as the prices you type in, and exchange fees and spreads are not included.
Updated Formula covered by automated tests
This converter answers questions like “how much ETH is my 0.25 BTC worth?” or “how many satoshis does $500 buy?” using prices that you type in. You look up the current price of each coin in your own currency, enter it, and the tool does the cross-rate arithmetic between coins, or between a coin and dollars, euros or any other fiat currency.
It does not contain any built-in prices and does not connect to a price feed. That is a deliberate choice: crypto quotes change every few seconds and differ between exchanges, so a number stored in a web page would be stale and misleading almost immediately. Entering the price yourself means you know exactly which quote, from which platform and at what time, the result is based on.
Typical uses are checking a trade before placing it, translating a balance into your home currency for a budget or a tax worksheet, and comparing what two exchanges imply for the same pair.
The formula
- amount
- How many units of the starting coin or currency you hold
- P(from)
- Price of one unit of the starting coin in your chosen fiat currency; equal to 1 if you start from fiat
- P(to)
- Price of one unit of the target coin in the same fiat currency; equal to 1 if the target is fiat
Most coins are quoted against a fiat currency or a dollar stablecoin rather than against each other, so a BTC to ETH rate is normally a cross rate: value the holding in fiat, then divide by the fiat price of the target coin. Both prices must be in the same currency, otherwise the result is off by the exchange rate between the two fiats.
Small units are common in practice. One bitcoin is divided into 100,000,000 satoshis and one ether into 10¹⁸ wei, so very small converted amounts are normal and are shown with up to eight decimal places.
Worked example
Priya holds 0.25 BTC and wants to know how much ETH it would buy. Her exchange shows BTC at $60,000 and ETH at $2,500 at the moment she checks (illustrative figures, not a market quote).
- 1 Value the bitcoin in dollars: 0.25 × $60,000 = $15,000.
- 2 Divide by the price of one ether: $15,000 ÷ $2,500 = 6 ETH.
- 3 Find the implied rate: $60,000 ÷ $2,500 = 24 ETH per BTC, and 0.25 × 24 = 6 ETH confirms the result.
Result: At those prices, 0.25 BTC converts to 6 ETH, worth $15,000. An actual trade would return slightly less after the exchange’s fee and spread.
Before you rely on the result
- Results depend entirely on the prices you enter; the tool cannot tell if a price is stale or from a different currency.
- Fees, spreads, slippage on large orders and network costs are not included.
- This is a unit-conversion aid, not investment advice. Crypto assets are highly volatile and can lose most of their value.
Frequently asked questions
Where can I find the current price of a coin?
Use the exchange or wallet you would actually trade on, since that is the price you would get. Public price-aggregator sites show an average across many exchanges, which is fine for an estimate. Note the time of the quote and make sure every price you enter is in the same fiat currency.
Why does my exchange give me less than this converter shows?
The converter uses the mid-market prices you type in. A real trade crosses the bid-ask spread and usually pays a trading fee, and converting BTC to ETH often goes through two trades (BTC to dollars, dollars to ETH), paying costs twice. Network withdrawal fees can also apply.
How quickly can the result go out of date?
Crypto trades around the clock with no closing bell, and moves of several percent within a day are common for major coins and larger for small ones. Treat any conversion as a snapshot of the moment the prices were entered and refresh them before acting.
Do I owe tax when I swap one coin for another?
In the United States the IRS treats digital assets as property, so exchanging one coin for another is generally a taxable disposal, measured in dollars at the time of the trade. Rules differ by country; check your tax authority’s guidance or a tax professional.
Sources
- IRS: Digital assets (irs.gov)
- Bitcoin: A Peer-to-Peer Electronic Cash System (white paper) (bitcoin.org)