Canning Sugar Syrup Calculator
Calculate water and sugar amounts for light, medium, and heavy canning syrups by jar count and size.
When canning fruit, sugar syrup serves as the packing liquid. It preserves color, texture, and flavor while preventing fruit from floating in the jar. The USDA defines standard syrup concentrations for home canning.
Standard Syrup Concentrations:
| Syrup Type | Sugar (%) | Sugar per Cup Water | Uses |
|---|---|---|---|
| Extra Light | 10% | 1.5 tbsp | Naturally sweet fruit |
| Light | 20% | 3.25 tbsp (¼ cup) | Sweet berries, cherries |
| Medium | 30% | 5.25 tbsp (⅓ cup) | Peaches, pears, apricots |
| Heavy | 40% | 7.5 tbsp (½ cup) | Tart fruit, sour cherries |
| Extra Heavy | 50% | 1 cup | Very tart fruit |
Formula: Sugar (cups) = Water (cups) × Sugar Ratio Total Volume = Water Volume + Sugar Volume (sugar dissolves and adds ~60% of its dry volume)
Syrup Needed per Jar: Each jar needs enough syrup to fill the space between fruit pieces.
| Jar Size | Syrup Needed (approx.) |
|---|---|
| Half-pint (8 oz) | ⅓ – ½ cup |
| Pint (16 oz) | ½ – ¾ cup |
| Quart (32 oz) | ¾ – 1¼ cups |
These amounts assume raw-pack (cold fruit placed in jars). Hot-pack (pre-heated fruit) requires slightly less syrup because the fruit compresses during heating.
Worked Example — 7 quart jars, medium syrup:
- Syrup per jar: ~1 cup → total needed: 7 cups
- Medium syrup: ⅓ cup sugar per cup water
- Overproduce by 15%: 7 × 1.15 = 8 cups needed
- Water: ~6.5 cups (sugar adds volume)
- Sugar: 6.5 × ⅓ = 2.17 cups sugar
- Makes approximately 8 cups of medium syrup
Tips:
- Always make 10–15% extra syrup to account for spillage and settling.
- Heat water to boiling, add sugar, stir until dissolved. Keep hot for packing.
- You can substitute honey for up to half the sugar in light and medium syrups.
- Fruit juice (apple, white grape) can replace all or part of the syrup for a no-added-sugar option.