How to Convert Between Dried and Fresh Herb Amounts

The standard rule is 1 tablespoon (15 ml) of chopped fresh herbs for every one 4 ml measure of dried herb — roughly 1/3 as much when using dried. This comes down to drying removing most of the herb's water content, which concentrates its flavor noticeably. This ratio is not identical for every herb, though; some lose a large part of their aroma as they dry, while others stay almost as potent. Because of that, the conversion should be adjusted slightly depending on the herb. When an older written recipe does not specify which form it means, it is safer to start by assuming dried and adjust to taste, rather than risk a mistake that is hard to correct once the dish is finished. Why Do You Use Less of the Dried Version? Drying removes most of the water inside the herb, leaving what aroma compounds remain far more concentrated. Compare the same volume of fresh and dried herb side by side, and the dried version leaves a much sharper, more dominant taste. Adding too much dried herb can turn a dish bitter or let one flavor drown out everything else on the plate, so staying within the ratio matters for a balanced result. Starting light and tasting as you go is always easier than trying to fix a dish that has too much herb in it already. What Is the Ratio for Common Herbs? For woody herbs like thyme and rosemary, the standard 3-to-1 ratio works well, since they hold onto most of their aroma when dried. Soft-leaved herbs like basil and parsley lose noticeably more aroma in drying, so you may need a bit more of the dried version than the ratio suggests. Fine, delicate herbs like dill, whose aroma is largely water-soluble, taste quite different dried compared with fresh; in that case it is safer to add the dried version gradually and taste as you go, rather than sticking rigidly to the ratio. Mint and thyme sit somewhere in between these two groups, each taking on a slightly different character once dried. What Should You Watch For When Converting? How long the dried herb has been sitting on the shelf matters too; an old jar may have lost most of its aroma, in which case the standard ratio falls short and you may need to add more than the formula suggests. Giving it a sniff is the most practical way to check whether it still has any real scent left. While dried herbs typically go in at the start of cooking, herbs converted the other way — from dried to fresh — should still generally go in toward the end; the conversion ratio only adjusts the quantity, not the timing. When Should Dried Herbs Not Replace Fresh Ones? In dishes where the herb is meant to be noticed visually and texturally, like salads, garnishes or cold sauces, dried herb is a poor substitute; it falls short on both appearance and texture in that kind of use. Dried herb only contributes aroma — it carries none of the fresh version's color or crunch. Using dried herb in a fresh basil pesto, or a kebab meant to be topped with chopped parsley, changes the character of the dish considerably; in those cases it makes more sense to hold off on the recipe until fresh herb is available rather than convert.