Scant Tablespoon to Teaspoons
1 scant tbsp ≈ 2.5 tsp
about 17% less than a level tablespoon's exact 3 tsp
Scant means barely, or a touch less than, the amount stated. A scant tablespoon is filled and then eased a little back under level, rather than swept exactly flat with a knife. That makes it roughly 83% of a level tablespoon: about 2.5 teaspoons instead of the level 3. It is an approximate measure by its nature. How much you ease off the top depends on the ingredient and how you scoop, so unlike a level tablespoon (which is exactly 3 teaspoons), a scant tablespoon has no single exact teaspoon value. Scant is the opposite of heaping, which piles the spoon above the rim for a little extra.
Scant, Level, Rounded and Heaping Tablespoon
Only the level tablespoon has an exact teaspoon equivalent. The others are approximate conventions that vary with the ingredient and how the spoon is filled.
When Scant Matters
Salt
The classic scant instruction. A scant teaspoon of salt is easy to overshoot, and a small excess is noticeable, so ease a little back off the top rather than heaping it.
Baking powder and soda
A scant measure of leavener avoids a metallic taste and over-rise. Fill, level, then tip a small amount back off. Never heap leaveners.
Strong or bitter spices
Cayenne, cloves, and nutmeg are often called for scant so they season without dominating. A touch under the round number is the safe direction.
Scant cup for flour
A scant cup of all-purpose flour is about 110 grams versus roughly 120 for a level cup. Measure level, then remove about a tablespoon or two.