Hong Life CalculatorsUnderstanding the sugar substitute converter — concept and principle
When you replace table sugar (sucrose) with erythritol, allulose, honey, maple syrup or stevia, the right amount is rarely the same weight. Each sweetener has a different relative sweetness, and liquid sweeteners also bring water. This converter gives a starting amount of the substitute for a given weight of sugar so that sweetness stays close to the original recipe.
How it is calculated
- Erythritol or allulose: substitute = sugar × 1.3, because both are roughly 70 % as sweet as sugar.
- Honey or maple syrup: substitute = sugar × 0.75, and reduce other liquid in the recipe by about 20 %.
- Stevia extract: substitute = sugar ÷ 250, using the middle of a 200–300× sweetness range for pure extract.
All weights are in grams.
The principle
Relative sweetness compares how sweet a substance tastes against sucrose at the same weight. If a sweetener is only 0.7 times as sweet, you need about 1 ÷ 0.7 ≈ 1.4 times the weight for equal sweetness; 1.3× is a common practical compromise because many people find full sugar sweetness unnecessary. Honey and maple syrup taste sweeter than their sugar content suggests (honey is rich in fructose) but contain roughly a fifth to a third water, so less is used and other liquid is cut. High-intensity sweeteners such as steviol glycosides are so strong that only a fraction of a gram replaces 100 g of sugar.
Worked example
Default: 100 g sugar replaced with erythritol.
- Factor for erythritol = 1.3.
- 100 × 1.3 = 130 g of erythritol.
| Sugar (g) | Amount of substitute |
|---|---|
| 25 | 32.5 g |
| 50 | 65 g |
| 75 | 97.5 g |
| 100 | 130 g |
| 125 | 162.5 g |
| 150 | 195 g |
| 200 | 260 g |
How to read the result
Treat the number as a first try and taste. Sugar also provides bulk, moisture retention, browning, tenderness and food for yeast. Erythritol does not brown and can recrystallise or feel cooling; allulose browns faster than sugar, so watch the oven; honey and syrups brown faster and make baked goods moister. With pure stevia the batter loses a lot of bulk, so recipes designed for stevia or blended products work better than a direct swap.
Common mistakes
- Using a branded "cup-for-cup" blend with the pure-extract factor, or vice versa.
- Swapping liquid sweeteners without reducing other liquids.
- Expecting the same texture, rise and colour in cakes and meringues.
Frequently asked questions
Is allulose or erythritol better for baking?
Allulose behaves more like sugar in moisture and browning, while erythritol gives a drier, sometimes crunchy texture; many bakers combine them.
Can I use honey in yeast bread?
Yes; it feeds yeast like sugar, but reduce the water slightly.
Why does my stevia cake taste bitter?
Steviol glycosides can leave a bitter or liquorice-like aftertaste at higher doses; use less or a blend.
Sources: U.S. FDA — Additional information about high-intensity sweeteners permitted for use in food in the United States. · Harold McGee, On Food and Cooking (Scribner) — sugars and sweeteners.