Since SWC is not part of blockchain there is not an official rate for 1 SWC. But there are some forums trade sweatcoin so there is an unofficial rate that they use to trade sweatcoin with. That rate at the moment is around $0.02-$0.03 per sweatcoin so use that as a rough estimate to know if you are getting a googd deal when buying or selling sweatcoin. There are also scammers that offer you a ridiculous $0.1 rate to buy your sweatcoin, so AVOID them, if it sounds too good to be true, it probably is. If you want to trade your sweatcoin safely there are some options for you, such as this site Sweatcoin.XYZ or SweatcoinGuide.
In summary, unofficial rate is around $0.025, be aware of scammers who offer you "too good to be true" offers, use Sweatcoin.XYZ or SweatcoinGuide for safe trading.