Stevia is 200 to 400 times sweeter than table sugar by weight. That means a tiny amount of pure stevia extract delivers the same sweetness as a full cup of sugar, with essentially zero calories. The exact sweetness depends on which compounds in the stevia leaf are used and how they’re processed.
The 200-to-400 Sweetness Range
Stevia’s sweetness comes from compounds called steviol glycosides, naturally found in the leaves of the stevia plant. The FDA lists steviol glycosides as 200 to 400 times sweeter than sucrose (table sugar) on a weight-for-weight basis. The reason for that wide range is that stevia leaves contain several different sweet compounds, and each one has a different intensity.
The two most common in commercial products are stevioside and Rebaudioside A (often labeled Reb A). Both clock in at roughly 300 times the sweetness of sugar. Reb A is generally considered the sweetest of the major steviol glycosides and has a cleaner, more pleasant taste than stevioside. Some newer steviol glycosides are even more potent. Rebaudioside M, for instance, has a higher sweetness intensity and a milder aftertaste, which is why it’s showing up in more products.
A useful rule of thumb: the more sugar-like molecules attached to the core steviol structure, the sweeter and less bitter the compound tends to be.
Why Stevia Tastes Different From Sugar
If stevia is so much sweeter, why doesn’t it taste exactly like sugar? The answer is that sweetness intensity and sweetness quality are two different things. Many people notice a bitter or metallic aftertaste with stevia, especially at higher concentrations. Researchers at the Technical University of Munich identified the reason: steviol glycosides activate two specific bitter taste receptors on the human tongue (hTAS2R4 and hTAS2R14) at the same time they trigger sweetness.
Not all stevia compounds cause the same level of bitterness. Stevioside and a less common compound called rubusoside are among the most bitter. Reb A is noticeably less bitter, and Rebaudioside D and Rebaudioside M have the weakest bitter aftertaste of the group. This is why products made with newer, more refined steviol glycosides tend to taste closer to sugar than early stevia products did.
People also vary in their sensitivity to stevia’s aftertaste. Some barely notice it, while others find it overwhelming. Genetics play a role in how strongly those bitter receptors respond.
Calories and Blood Sugar
One gram of sugar contains 4 calories, and a tablespoon has about 60 calories. Because you need so little stevia to match sugar’s sweetness, the calorie contribution is effectively zero. A single teaspoon of stevia extract replaces an entire cup of sugar, so the math works heavily in stevia’s favor for anyone watching calorie intake.
Stevia also has a low glycemic index, meaning it doesn’t raise blood sugar the way sucrose does. Studies comparing the two sweeteners in healthy individuals confirm that stevia produces a much smaller blood glucose response than an equivalent sweetness of sugar. This makes it a common choice for people managing diabetes or trying to reduce sugar intake.
Practical Conversion for Cooking
Because stevia is so concentrated, replacing sugar in recipes requires careful measurement. These conversions are approximate and can vary between brands, but they provide a reliable starting point for pure stevia extract:
- 1 cup of sugar = 1 teaspoon stevia powdered extract, or 1 teaspoon stevia liquid concentrate
- 1 tablespoon of sugar = 1/4 teaspoon stevia powdered extract, or 6 to 9 drops stevia liquid concentrate
- 1 teaspoon of sugar = a pinch (about 1/16 teaspoon) stevia powdered extract, or 2 to 4 drops stevia liquid concentrate
Many store-bought stevia products (like Truvia or PureVia) are blended with bulking agents such as erythritol or dextrose so they measure more like sugar, sometimes at a 1:1 or 2:1 ratio. Always check the label, because a packet of blended stevia and a pinch of pure extract are very different things.
What Changes When You Bake With Stevia
Sweetness is only one of sugar’s jobs in the kitchen. Sugar adds bulk, structure, and moisture to baked goods. It also drives caramelization and the Maillard reaction, the chemical process that creates golden-brown crusts on cookies, cakes, and bread. Stevia does none of this. When you replace all the sugar in a recipe with stevia, the result is often flatter, paler, and drier than expected.
For this reason, many bakers do a partial swap, replacing half or two-thirds of the sugar with stevia and keeping the rest for texture and browning. Alternatively, blended stevia products that include erythritol or other sugar alcohols can help restore some of the lost bulk. Recipes specifically developed for stevia tend to compensate with extra fat, eggs, or other moisture sources.
How Much Is Safe
The joint FAO/WHO Expert Committee on Food Additives sets the acceptable daily intake for steviol glycosides at 4 milligrams per kilogram of body weight per day. For a 150-pound (68 kg) person, that works out to about 272 milligrams of steviol equivalents daily. Given how little stevia you need to sweeten food, most people stay well below this threshold even with regular use. The FDA considers high-purity steviol glycosides (95% or higher purity) to be generally recognized as safe.