Candy Stages Table
| Stage | F | C | Makes |
|---|---|---|---|
| Thread | 230-233 | 110-112 | jellies, glazes |
| Soft ball | 234-240 | 112-116 | fudge, fondant |
| Firm ball | 244-248 | 118-120 | caramels |
| Hard ball | 250-266 | 121-130 | nougat, rock candy |
| Soft crack | 270-290 | 132-143 | taffy |
| Hard crack | 300-310 | 149-154 | brittle, lollipops |
Cooking sugar syrup is a ladder of stages, and every candy name on the recipe card is a temperature in disguise: thread around 230°F, soft ball at 234-240, hard crack at 300-310. The stage is set by how much water has boiled away - the hotter the syrup, the more concentrated the sugar - so a thermometer does not just time the candy, it is the candy. Type any reading and the converter names the stage and what it is for.
Two habits make the ladder reliable. First, altitude subtracts about 2 degrees Fahrenheit from every stage per thousand feet above sea level - the water boils off sooner - so high-country bakers calibrate by boiling plain water first and subtracting what they see. Second, stop the cooking by dropping the pan bottom in ice water for a second; carryover heat keeps climbing the ladder after the burner is off, and one skipped stage is the difference between fudge and brittle.
How to use
- Type your thermometer reading in Fahrenheit or Celsius - the stage name and its typical use appear instantly.
- Calibrate for altitude: boil plain water, note its temperature, and subtract the difference from every stage on the chart.
- Test the old way alongside the thermometer: drop syrup into ice water and feel - the stage names literally describe the ball or crack you get.
Frequently asked questions
What temperature is the soft ball stage?
234 to 240 degrees Fahrenheit - 112 to 116 Celsius. A drop of syrup in ice water forms a ball that flattens when you remove it, which is exactly what fudge, fondant and pralines need. Two degrees past soft ball and the same recipe turns grainy and hard, which is why candy makers pull the pan at the low end and let carryover do the rest.
What is the hard crack stage used for?
300 to 310 degrees Fahrenheit - 149 to 154 Celsius - where almost all the water has boiled away. Syrup at hard crack forms rigid, glassy threads that snap: lollipops, peanut brittle and anything that must shatter. Below this, at soft crack, you get taffy's stretch instead of glass; above it, around 320, the sugar itself begins to caramelize and color.
Why does altitude change candy stages?
Water boils at a lower temperature the thinner the air, so sugar syrup reaches every stage about 2 degrees Fahrenheit sooner per 1,000 feet of elevation. The sugar concentration that defines each stage does not change - only the thermometer reading that gets you there does. The fix is calibration: boil water, see where it boils (say 202 at 5,000 feet), and read the chart shifted down by the same 10 degrees.
What stage is jam-making?
Jam does not climb this ladder - it sets around 220 degrees Fahrenheit, just below the thread stage, where sugar concentration hits about 65 percent and the pectin can gel. Candy making starts where jam stops; the thread stage at 230 is the first truly candy-level concentration. The National Center for Home Food Preservation's syrup tables cover the canning side of the same sugar-water chemistry.
Can I make candy without a thermometer?
Yes - the cold-water test is the original method and still works: drop syrup into ice water and read the result. A soft ball flattens, a firm ball holds its shape, hard ball is moldable like plasticine, soft crack bends, hard crack snaps. The stage names ARE the test. A thermometer just removes the guesswork; the chart above is what both methods are reading.