The amount of sugar to add to your homemade lemonade will depend on your personal taste preferences and the tartness of your lemons. A typical ratio of sugar to lemon juice is 1:1, meaning you would add equal parts water too sugar. However, some people prefer their lemonade to be less sweet and use a 1:2 ratio instead. You can start with a smaller amount of sugar and add more to taste if needed. Keep in mind that you can always add more sugar later, but it's harder to remove excess sweetness once it's been added.