Vinegar Strength Converter

Vinegar strength is measured in two ways: acidity percentage and grain.

The conversion:

• Grain = Acidity % x 10
• Acidity % = Grain / 10

Common vinegar strengths:

• White distilled vinegar: 5% (50 grain) — standard cooking
• Apple cider vinegar: 5% (50 grain)
• Rice vinegar: 4% (40 grain)
• Wine vinegar: 6-7% (60-70 grain)
• Balsamic vinegar: 6% (60 grain)
• Cleaning vinegar: 6-10% (60-100 grain)
• Pickling vinegar: 7% (70 grain)
• Industrial vinegar: 20-30% (200-300 grain)

Safety note:

• Vinegar above 10% acidity can irritate skin and eyes.
• Industrial vinegar (20%+) requires gloves and ventilation.

The grain system is a holdover from the days before precise lab measurement, when vinegar strength was gauged during production. It survives mostly on labels and in canning recipes, and the conversion is trivial once you know grain is just the acidity percentage times ten.

Strength matters more than people assume. Safe home pickling and canning rely on vinegar of at least 5 percent acidity, because that acidity is what holds bacteria in check; a weaker “seasoned” rice vinegar can make a preserve unsafe. Cleaning is the opposite case, where the higher-acidity cleaning vinegars cut grease and mineral scale better than the kitchen kind. The safety note above bears repeating: anything past 10 percent can burn skin and eyes, so treat industrial-strength vinegar with real caution.