BTC (Bitcoin) to USDT (Tether) refers to the exchange rate between Bitcoin and Tether. Tether (USDT) is a stablecoin that aims to keep its value equivalent to the US dollar. The BTC to USDT rate indicates how much Tether you can get for one Bitcoin.

To find the current exchange rate, you can check cryptocurrency exchanges like Binance, Coinbase, or Kraken, or use financial websites like CoinMarketCap or CoinGecko. The rate fluctuates frequently due to the volatile nature of cryptocurrencies.