Altcoin Conversion Calculator
Convert any amount of one cryptocurrency into another using current USD spot prices. Useful for sizing a target purchase or estimating what your holdings translate to in another token.
Last updated: May 2026
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About this calculator
This calculator uses a simple cross-rate formula: Converted Amount = (amount × fromPrice) / toPrice. It first values your input amount in USD by multiplying by the source coin's price, then divides by the destination coin's price to express the result in units of the destination coin. For example, 1 BTC at $60,000 converts to 30 ETH at $2,000 (1 × 60,000 / 2,000 = 30). Edge cases: the formula uses spot prices and ignores everything that affects real-world conversions — exchange spreads, taker/maker fees (typically 0.1–0.5% per leg), slippage on thin order books, withdrawal fees, and the latency between viewing a price and executing a trade. For large amounts, slippage can easily exceed 1–5% on mid-cap altcoins, meaning the realised conversion is materially worse than this theoretical figure. The calculator also assumes a direct USD pricing reference for both tokens; in reality you usually need a stablecoin or quote-currency intermediary (BTC-USDT, ETH-USDT) and may pay two sets of fees if there is no direct pair on your exchange. Treat this as a back-of-envelope sizing tool, not as a real-time price quote — for actual execution always check the live order book on the venue you plan to trade on.
How to use
Example 1 — converting BTC to ETH for a swap. You have 0.5 BTC and want to know roughly how much ETH that buys. BTC price $60,000, ETH price $3,000. Step 1: USD value = 0.5 × $60,000 = $30,000. Step 2: divide by ETH price: 30,000 / 3,000 = 10 ETH. Verify: 0.5 BTC × (60,000 / 3,000) = 0.5 × 20 = 10 ETH ✓. In real trading, two-leg fees of 0.2% each plus moderate slippage could leave you with ~9.94 ETH instead of 10. Example 2 — converting a mid-cap altcoin to USDC. You hold 1,000 SOL at $140 and want to know the USDC equivalent. SOL price $140, USDC price $1.00. Step 1: USD value = 1,000 × $140 = $140,000. Step 2: divide by USDC price: 140,000 / 1.00 = 140,000 USDC. Verify: USDC tracks $1 by design, so the converted amount equals the USD value ✓. For a $140,000 SOL sale into USDC, fees of 0.2% take roughly $280, and slippage on a deep pair like SOL-USDC adds little (<0.1%); the realisable conversion is around 139,580 USDC, close to the calculated number. ✓
Frequently asked questions
Why does my exchange give a different conversion rate than this calculator?
Several reasons. First, prices: the calculator uses whatever prices you enter, but live exchange prices update second-by-second and the spread between bid and ask is typically 0.05–0.5% even on liquid pairs. Second, fees: most exchanges charge 0.1–0.5% per trade for makers and takers, and a cross-coin conversion usually involves two trades (FROM-token → quote currency → TO-token) so you pay roughly double. Third, slippage: if your order is large relative to order-book depth, the average fill price is worse than the visible top-of-book price, eating another 0.1–5% depending on size and liquidity. Fourth, withdrawal/network fees: moving funds on-chain costs gas, which on Ethereum mainnet can be $5–100 per transaction. Finally, exchange-specific 'instant convert' features often add hidden margins of 0.5–2% on top of stated fees. To minimise the gap, use a deep order book, place limit orders rather than market orders, and check the all-in cost (fees + slippage + spread) for the specific pair on the specific venue.
Should I convert directly between altcoins, or always go through USD or USDT?
It depends on whether the direct pair exists with reasonable liquidity. For major pairs like ETH-BTC, BNB-BTC or SOL-ETH on large exchanges, direct conversion is usually cheaper because you pay one fee instead of two and the bid-ask spread is tight. For mid- and small-cap altcoins, the direct pair often doesn't exist or has poor liquidity, forcing two trades through a quote currency (USDT, USDC or BTC) and doubling fees and slippage. Many DEX aggregators (1inch, Jupiter on Solana, Matcha) automatically route through the cheapest multi-hop path and may find direct AMM pools that no centralised exchange lists. Before converting, check at least two venues for the actual realisable rate on your specific size — for large amounts, the spread between best and worst can be 1–3% of notional, far more than the calculator's theoretical answer would suggest. For small retail conversions, the cheapest route is usually whichever venue you already have funds on, since cross-exchange transfer fees often outweigh the savings.
How accurate is the spot-price conversion for large amounts?
For small amounts on liquid pairs, very accurate — fees and slippage might total 0.2–0.5%, so the realised conversion is within ~0.5% of the calculator's number. For large amounts on the same liquid pairs (say, $1M+ in BTC-ETH), slippage starts to dominate — even on Binance's deepest book, a $5M market order can move price 0.5–1%, and the average fill is worse than top-of-book by a similar amount. For mid- and small-cap altcoins, large conversions can experience 5–20% slippage on a single market order; placing limit orders, splitting into smaller chunks executed over hours, or using TWAP/VWAP execution algorithms is essential. The calculator gives you the no-friction theoretical answer; the realistic answer for $10M+ orders typically needs an OTC desk or careful algorithmic execution rather than a single click. Always model in 0.3–2% slippage for retail-sized trades on liquid pairs, and 5–15% for thin or exotic pairs.
What are the common mistakes when estimating altcoin conversions?
The biggest mistake is using stale prices — even five minutes old can put you 1–5% off in crypto's fast markets. Always pull live prices from CoinGecko, CoinMarketCap or directly from the venue. The second is forgetting fees: a 'one-step' conversion on a CEX is often two trades under the hood, with each leg charging fees, so the calculated amount is 0.3–1% too optimistic. The third is conflating different stablecoins as identical — USDT, USDC and DAI can trade at small premiums or discounts (1–3 cents during stress events), and pricing both inputs in 'USD' assumes parity that may not hold. People also forget network fees: converting on Ethereum mainnet during congestion can cost $30–100 in gas regardless of trade size, which is a huge percentage on small orders. Finally, ignoring slippage on illiquid pairs is the most expensive mistake — a $10,000 buy of a $5M-market-cap altcoin can move price 10%+, leaving you with far fewer coins than the calculator suggests.
When should I not use this calculator?
Do not use it for executing large trades — it ignores slippage, which dominates real outcomes above retail size; use the venue's order book or aggregator quote instead. It is not appropriate for derivatives or perpetual-futures conversions, which involve funding rates, mark-versus-index price differences, and contract specifications that a simple spot-price formula cannot capture. Do not use it for fiat-on-ramp or off-ramp transactions; on-ramps (Coinbase, Kraken, Moonpay) typically charge 0.5–5% markup over spot, often hidden in the displayed price, and the calculator's theoretical answer will be too generous. It is not suitable for cross-chain conversions involving bridges, where bridge fees (0.1–1%) and slippage on the destination side stack on top of price conversion — use a bridge-specific cost calculator. Finally, do not use it as a quote for arbitrage opportunities; by the time you read the result and execute, prices on both venues have moved and the apparent gap usually disappears.