Here are some basic sugar to stevia conversions.
2 teaspoons of sugar – use ¼ teaspoon stevia
¼ cup sugar – use ½ teaspoon stevia
1/3 cup sugar – use ¾ teaspoon stevia
½ cup sugar – use 1 ¼ teaspoons stevia
¾ cup sugar – use 1 ¾ teaspoons stevia
1 cup sugar – use 2 ½ teaspoons stevia
Find it online: https://experimentalhomesteader.com/stevia-extract/