Simple Syrup Ratio Calculator | Work Back to Sugar and Water Weights
Start from the finished volume you want and work back to the sugar weight and water you need, by weight. It handles 1:1 (standard), 2:1 (rich), and custom ratios, and works out the finished volume from the density of real sugar syrups in the USDA sucrose table. A 1:1 batch finishing at 500ml needs about 307g sugar and 308ml water with ml / g selected; fl oz / oz is the default for US measures.
💡 About this tool
Bartenders talk about syrup in ratios — 1:1, 2:1 — but those ratios are defined by weight: 1:1 means one gram of sugar per gram of water, and 2:1 means two grams of sugar per gram of water. The trouble is most recipes are written by volume ("2 cups sugar to 1 cup water"), and a cup of sugar varies with brand, grain size, and how you scoop it. Weighing keeps every batch tasting the same.
This calculator treats the ratio by weight and solves backward from your target yield. It also takes the weight of the finished volume from the USDA sucrose conversion table (pounds per gallon of sucrose solution at 20 °C, every 0.1 °Brix) and splits that weight into sugar and water, so dissolved sugar is counted by what it really adds to the syrup — not the full volume the dry crystals seemed to occupy. That's why the finished volume is never just "sugar volume plus water volume." It's built for bar pros prepping syrup daily and home crafters scaling a recipe up or down.
🧐 Frequently Asked Questions
Q. Is 1:1 / 2:1 by weight or by volume? A. This tool uses weight. 1:1 is one gram of sugar per gram of water; 2:1 is two grams of sugar per gram of water. Pro recipes recommend weighing for consistent sweetness.
Q. Why is sugar shown by weight but water by volume? A. Sugar is most accurate by weight (oz or g). Water has a density of about 1 g/ml, so its weight and volume line up closely, which is why water is shown in fl oz or ml.
Q. Why doesn't the yield equal sugar volume plus water volume? A. Dissolved sugar takes up less space than dry crystals. The tool skips the sum and reads the density of a sucrose syrup at 20 °C from the USDA table, so the result is less than a simple sum.
Q. What changes when I switch to 2:1? A. For the same finished volume you use more sugar, raising sweetness and viscosity. With less water it dilutes a cocktail less and tends to keep longer.
Q. Does this work for sugars other than granulated white? A. The by-weight logic is the same, but raw or cane sugars differ in density and moisture, so the yield shifts a little. Treat the figures as a guide.
📚 Fun Facts
In bar circles 2:1 is called "rich syrup," and outside the United States it's the default — Difford's Guide builds its recipes around 2:1. Because it adds the same sweetness in a smaller pour, it's prized for spirit-forward drinks like the Old Fashioned and the Daiquiri, where you want sweetness without watering things down. Higher sugar concentration also resists microbial growth, so a 2:1 keeps noticeably longer than a 1:1 in the fridge.