Identify how you’ll use celery salt (seasoning blend for savory cooking vs. baking). If the recipe needs pure saltiness, prioritize a combo approach (celery seed + salt).
Swap using the listed ratio for your closest match, then add gradually (especially for blends like Old Bay).
Mix the substitute into wet ingredients early (sauces, dressings) or distribute dry seasoning evenly (potatoes, meat rubs, dough).
Taste after the first cook step (or after combining dough/sauce). Adjust with extra salt or a pinch more celery seed to dial in the celery aroma.
If you made a celery-seed + salt blend, store it airtight so the celery aroma doesn’t fade.