Spice Conversion Calculator: Convert Fresh Herbs to Dried (and Back)

A recipe calls for 2 tablespoons of fresh basil and you have a jar of dried. Do you use the same amount? Absolutely not — dried herbs are far more concentrated than fresh, and using equal volumes will make your dish taste like you bathed it in potpourri. The CalcHub Spice Conversion Calculator gives you the correct substitution amounts for any herb, in either direction.

The General Rule

Dried herbs are roughly 3× more concentrated than fresh herbs by volume (because drying removes most of the water weight). The standard conversion:

1 tablespoon fresh herb = 1 teaspoon dried herb

Or conversely: 1 teaspoon dried = 1 tablespoon (3 teaspoons) fresh

Herb-Specific Conversions

The 3:1 ratio is a good default, but some herbs differ:

Fresh Herb	Dried Equivalent	Ratio	Notes
Basil	1 tbsp fresh = 1 tsp dried	3:1	Fresh preferred for uncooked dishes
Oregano	1 tbsp fresh = ¾ tsp dried	4:1	Dried can be more pungent
Thyme	1 tbsp fresh = ¾ tsp dried	4:1	Dried releases well in long cooks
Rosemary	1 tbsp fresh = 1 tsp dried	3:1	Strip from stem; dried is fine
Cilantro	1 tbsp fresh = 1 tsp dried	3:1	Dried loses most flavor; fresh preferred
Parsley	1 tbsp fresh = 1 tsp dried	3:1	Dried much less flavorful
Dill	1 tbsp fresh = 1 tsp dried	3:1	Both work well
Sage	1 tbsp fresh = 1 tsp dried	3:1	Dried is quite strong
Bay leaves	1 fresh = 1 dried	1:1	Dried actually more aromatic
Mint	1 tbsp fresh = 1 tsp dried	3:1	Fresh preferred in most applications
Tarragon	1 tbsp fresh = 1 tsp dried	3:1	Dried loses subtlety
Chives	1 tbsp fresh = 1 tsp dried	3:1	Fresh strongly preferred

Fresh-to-Ground Spice Conversions

For whole spices converted to ground:

Whole Spice	Ground Equivalent
1 tsp black peppercorns	~¾ tsp ground pepper
1 cinnamon stick (3 inches)	½ tsp ground cinnamon
1 tsp coriander seeds	~¾ tsp ground coriander
1 tsp cumin seeds	~¾ tsp ground cumin
6 whole cloves	¼ tsp ground cloves
1 tsp fennel seeds	~¾ tsp ground fennel
1 whole nutmeg	2–3 tsp ground nutmeg

Freshly ground spices are significantly more aromatic than pre-ground. If you have whole spices and a grinder, use them.

When Fresh vs. Dried Matters Most

Use fresh when:

• The herb is uncooked or added at the end (basil, cilantro, chives in a cold dish)
• The herb's delicate aromatic oils are key to the dish (pesto, chimichurri)
• Appearance matters (garnish)

Use dried when:

• Cooking time is long (braises, stews, soups) — dried herbs hold up better
• The herb would overpower in fresh form (bay leaves, oregano in tomato sauce)
• Convenience outweighs fresh flavor

Neither works well: Cilantro and chives lose most of their character when dried. Fresh is strongly preferred, or skip entirely.

How do I convert garlic powder to fresh garlic?

Not technically an herb, but very common: 1 clove fresh garlic = ¼ teaspoon garlic powder = ½ teaspoon minced fresh garlic from a jar. For garlic paste: 1 clove = approximately ½ teaspoon.

What about spice blends? Can I convert those?

Not directly — blends like Italian seasoning, herbes de Provence, and garam masala are balanced mixtures. The calculator handles single-ingredient conversions; for blends, use them as directed or make your own from individual spices.

How long do dried herbs stay potent?

Dried herbs and ground spices are best within 1–3 years. They don't spoil, but potency fades. The simple test: crush a pinch between your fingers and smell. If the aroma is weak, use more or replace the jar.

Related Calculators

• Recipe Scaler Calculator — Scale recipes up before converting spice amounts
• Baking Substitution Calculator — Handle non-spice ingredient substitutions
• Catering Calculator — Plan large-volume spice purchases for catered events