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Lemon juice is doing one of two jobs: brightening flavour, or supplying acid that reacts with baking soda. The first is forgiving and the second is not, so identify which before you substitute.
Best for: Almost everything
Slightly more floral. The closest all-round match.
Best for: Baking, dressings, anywhere the acid matters more than the flavour
Sharper than lemon, so start with half and taste.
Best for: Preserving and canning where precision matters
Pure sourness, no flavour.
Best for: Sweet applications only
Much less acidic, so it will not reliably activate baking soda.
In baking, if the lemon juice is there to react with baking soda (many quick breads, pancakes, and buttermilk substitutes), the substitute has to be genuinely acidic. Vinegar works, orange juice generally does not. Bottled lemon juice is fine for acid but tastes noticeably duller than fresh, so use fresh where the lemon is the point.
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Yes, at about half the volume, since vinegar is sharper. Apple cider or white wine vinegar are the mildest options. It works especially well in baking, where the job is to provide acid rather than lemon flavour.
A medium lemon gives roughly 2 to 3 tablespoons of juice and about 1 tablespoon of zest. Roll it firmly on the counter before juicing to get more out of it.
Any acid works. Use 1 tablespoon of white vinegar or apple cider vinegar per cup of milk, stir, and let it sit 5 minutes until it thickens slightly.
Lime juice is the closest match, at 1:1. Almost everything. Slightly more floral. The closest all-round match.
Lime juice (1:1) if you want the closest result, or White wine vinegar or apple cider vinegar (½ the volume) for baking, dressings, anywhere the acid matters more than the flavour. Which one is right depends on what the lemon juice was doing in the dish.
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