Candy & Caramel Temperature Stage Calculator
Find the sugar-cooking stage — from thread to caramel — for any temperature, with the altitude adjustment that keeps your candy on target.
How it works
Altitude drop = altitude ÷ 500 (°F) · Adjusted = target − drop · °C = (°F − 32) × 5 ÷ 9
As sugar syrup boils, its temperature rises because the water fraction falls, and each temperature band produces a characteristic texture — the old cold-water test named these “ball” and “crack” stages. A thermometer is faster and safer. At altitude, water boils cooler, so every candy target drops by roughly 1°F per 500 feet of elevation; skipping that adjustment overcooks the sugar.
Worked example
A fudge recipe calls for the soft-ball stage, about 238°F at sea level. At 3,000 ft you subtract 3,000 ÷ 500 = 6°F, so you pull the pan at roughly 232°F to get the same texture.
Frequently asked questions
What are the main candy stages and their temperatures?
At sea level: thread ~223–234°F, soft ball ~234–241°F, firm ball ~244–248°F, hard ball ~250–266°F, soft crack ~270–290°F, hard crack ~300–310°F, and caramel ~320–350°F. Each corresponds to how the cooled sugar behaves.
Why adjust for altitude?
Candy temperatures assume water boils at 212°F. Higher up, it boils cooler, so the sugar reaches a given concentration at a lower reading. Subtracting about 1°F per 500 feet keeps the finished texture correct.
Do I still need a candy thermometer?
It is by far the most reliable tool. The cold-water test works in a pinch — dropping syrup into cold water and judging the ball or thread — but a calibrated thermometer removes the guesswork, especially for the narrow crack stages.
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This calculator is for educational purposes. Double-check important results before acting on them.