🍪 Royal Icing Calculator
Get exact ingredient amounts for outlining, flooding, and decorating cookies
| Cookies (Medium) | Powdered Sugar | Meringue Powder | Water (Flood) | Water (Outline) |
|---|---|---|---|---|
| 12 cookies | 2 cups (240g) | 2 tbsp | 4 tbsp | 2-3 tbsp |
| 24 cookies | 4 cups (480g) | 4 tbsp | 8 tbsp | 4-6 tbsp |
| 36 cookies | 6 cups (720g) | 6 tbsp | 12 tbsp | 6-9 tbsp |
| 48 cookies | 8 cups (960g) | 8 tbsp | 16 tbsp | 8-12 tbsp |
| 60 cookies | 10 cups (1200g) | 10 tbsp | 20 tbsp | 10-15 tbsp |
| 72 cookies | 12 cups (1440g) | 12 tbsp | 24 tbsp | 12-18 tbsp |
| Binding Agent | Amount per 2 cups sugar | Shelf Life | Notes |
|---|---|---|---|
| Meringue Powder | 2 tbsp | 2-3 days | Most consistent, food-safe |
| Fresh Egg Whites | 2 large whites (~60g) | 1-2 days | Use pasteurized for safety |
| Aquafaba | 3 tbsp | 1-2 days | Vegan option, slightly less stiff |
| Cookie Size | Icing per Cookie | Cookies per Batch | Use For |
|---|---|---|---|
| Small (2 inch) | ~2 tsp | 18-20 | Mini treats, samplers |
| Medium (3 inch) | ~1 tbsp | 12-14 | Standard sugar cookies |
| Large (4 inch) | ~2 tbsp | 8-10 | Detailed designs |
| X-Large (5+ inch) | ~3 tbsp | 5-6 | Showpiece cookies |
| Measurement | Grams | Ounces | Notes |
|---|---|---|---|
| 1 cup powdered sugar | 120g | 4.2 oz | Sifted before measuring |
| 1 tbsp meringue powder | 9g | 0.3 oz | Level measurement |
| 1 tbsp water | 15g | 0.5 oz | Room temperature |
| 1 large egg white | 30g | 1 oz | No yolk or grease |
| 1 tbsp aquafaba | 15g | 0.5 oz | Chickpea brine |
Royal icing is sweet and helps to decorate sugar cookies, gingerbread houses, wedding cakes, Christmas cakes and cupcakes. It gives a bright and smooth look so that cakes seem fresh from a bakery The name “royal” came from the wedding cake of Queen Victoria in 1840.
Basic ingredients of royal icing are simple. You mix powdered sugar with egg whites or meringue powder, occasionally adding some drops of lemon juice or lime juice. Some recipes require only egg whites and powdered sugar, without measuring except adding sugar until the thickness is right.
How to Make and Use Royal Icing
Use two parts egg whites to nine parts sugar by weight, a ratio that ensures the icing dries crsip.
Royal icing is made of sugar and egg whites without any fat. That makes it different from buttercream with sugar and butter, which stays soft and creamy. Without butter it is firmer and shines more.
Good icing quickly sets and does not break teeth after drying. You can make it even without meringue powder and a mixer.
Important is the right consistency. Beat the icing long until a spatula stands alone in the mass. Use a paddle attachment instead of a whisk to avoid overbeating.
Too much beating can make the icing sticky or not dry at all.
Oil and grease are enimies of royal icing. Any oil in the bowl or on tools stops its good drying. Wipe gear with vinegar or lemon juice to remove oily traces.
Use only water-based extracts, never oil-based ones. Lemon essence replaces a bit of water for better taste. Vegan version works with aquafaba, which is chickpea water, although it tastes only a little.
Royal icing quickly dries uncovered. Cover leftovers with plastic wrap, pressed to the surface against a crust. Keep it in an airtight tin at room temperature or in the fridge for two weeks, or freeze indefinitely.
Liquid icing for flooding should be used the same day. For cakes of two to three inches, one batch covers eighteen to twenty-four cakes roughly with one layer and details.
