Those who’ve been cooking for a long time get pretty good at eyeballing a teaspoon of an ingredient. If you’d rather have a guideline and your measuring spoons are MIA, a few common items can come in handy.
A typical small kitchen spoon—the kind you use to stir your coffee—is approximately one teaspoon. Or, grab a tablespoon and fill about one-third of it with your ingredient.
The top half of a woman’s thumb—from the tip to the first knuckle—is about the size of a teaspoon. Measure solid ingredients to match against your thumb and you should be safe.
A postage stamp and one six-sided die are also about the size of one teaspoon.
Use the cap of a water bottle for measuring liquids.