Fresh to Dry Herb Conversion Calculator

The standard conversion ratio is 3:1 — you need three times as much fresh herb as dried to achieve the same flavor intensity. This is because drying concentrates the essential oils and flavor compounds in the herb. So if a recipe calls for 1 teaspoon of dried thyme, use 3 teaspoons (1 tablespoon) of fresh thyme instead.

Divide the fresh herb amount by the herb's specific conversion ratio (typically 3). For example, 3 teaspoons of fresh basil equals 1 teaspoon of dried basil. Some herbs like bay leaf or rosemary have slightly different ratios due to their oil density, which is why using a herb-specific calculator is more accurate than a one-size-fits-all rule.

Use one-third the amount of dried herb compared to fresh. If a recipe calls for 1 tablespoon of fresh parsley, substitute with 1 teaspoon of dried parsley. Because dried herbs are more concentrated, a little goes a long way — start with less and taste as you cook.

Yes, dried herbs are significantly more potent than fresh because the drying process removes moisture and concentrates the volatile flavor compounds. This is why you only need one-third to one-half as much dried herb compared to fresh in most recipes. However, over time dried herbs do lose their potency, so always check that yours are still fragrant.

Air drying typically takes 1–3 weeks depending on the herb and humidity. Delicate herbs like basil and cilantro dry faster, while woody herbs like rosemary and thyme can take longer. Oven drying at around 180°F (80°C) takes 2–4 hours, and a food dehydrator can dry herbs in 1–4 hours at 95–115°F.

The ideal oven temperature for drying herbs is 180°F (80°C) or lower. Higher temperatures can cause the essential oils — responsible for aroma and flavor — to evaporate too quickly, reducing the quality of the dried herb. For air drying, a warm, dry, well-ventilated spot away from direct sunlight works best.

Dried herbs typically last 1–3 years when stored properly in an airtight container away from heat and light. Older dried herbs lose potency, so you may need to use more than the standard conversion amount. A quick freshness test: crush a pinch between your fingers — if you can't smell a strong aroma, it's time to replace them.

Dried herbs and ground spices are not exactly the same — ground herbs are more finely processed, making them even more concentrated. Generally, you use about one-half the amount of ground herb compared to dried (e.g., 1 tsp dried = ½ tsp ground). This calculator provides all three equivalents: fresh, dried, and ground for each herb.