No - sweat is your cooling system, not your calorie meter: sweating itself takes very little energy, and a cool-weather run can burn hundreds of calories with little sweat.
Cleveland Clinic's example is the cleanest: it is the running, not the sweating, that burns. A sauna drenches you and burns almost nothing; sweat rate depends on heat, humidity, and genetics - fitter people often sweat sooner. The post-workout scale drop is water, and it comes back with your next drink. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper .
What to do
Common questions
Does sweating more mean more calories burned?
No - sweat is your cooling system, not your calorie meter. Cleveland Clinic puts it plainly: sweating itself takes very little energy; it starts when your body needs to dump heat, whether that heat came from hard exercise, hot weather, or a fever. The clean illustration: running in cool weather can burn hundreds of calories with relatively little sweat - it is the running, not the sweating, that does the work. Flip it and the myth dies completely: sitting in a sauna drenches you and burns almost nothing. How much you sweat depends on temperature, humidity, genetics, and fitness - fitter people often sweat sooner and more, because their cooling systems are better trained, which is the opposite of what the myth assumes. The scale after a sweaty session shows water, and it returns with the next liter you drink. Judge a workout by heart rate, effort, and duration - and treat sweat as a hydration instruction, not a scoreboard.