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Comprehensive Fruit, Vegetable & Grass Refractometer (%Brix) Reference Chart

Posted by Charlie Downs on

Comprehensive Fruit, Vegetable & Grass Refractometer (%Brix) Reference Chart

A refractometer is one of the fastest ways to estimate the sugar density, dissolved solids, plant health, nutrient uptake efficiency, and overall crop quality of fruits, vegetables, and forage grasses. Higher °Brix readings are generally associated with:

  • Better flavor
  • Higher nutrient density
  • Greater mineral uptake
  • Improved shelf life
  • Better drought resistance
  • Reduced pest pressure
  • Healthier soils and plant metabolism

The chart below organizes common crops into four quality zones:

  • Poor = Weak nutrition, stressed growth, low flavor
  • Fair = Average commercial quality
  • Good = Healthy and nutrient-dense
  • Excellent = Premium quality, highly mineralized crops

Fruit %Brix Chart

Fruit Poor Fair Good Excellent
Apples <10 10–12 13–15 16+
Apricots <9 9–11 12–14 15+
Avocados <4 4–6 7–9 10+
Bananas <18 18–20 21–24 25+
Blackberries <7 7–9 10–12 13+
Blueberries <10 10–12 13–15 16+
Cantaloupe <8 8–11 12–14 15+
Cherries <12 12–15 16–20 21+
Coconut Water <3 3–4 5–6 7+
Cranberries <7 7–9 10–12 13+
Figs <14 14–18 19–22 23+
Grapefruit <8 8–10 11–13 14+
Grapes (Wine) <18 18–21 22–25 26+
Grapes (Table) <14 14–16 17–20 21+
Honeydew <9 9–11 12–14 15+
Kiwi <12 12–14 15–17 18+
Lemons <5 5–6 7–8 9+
Limes <5 5–6 7–8 9+
Mangoes <10 10–13 14–17 18+
Oranges <9 9–11 12–14 15+
Papaya <9 9–11 12–14 15+
Peaches <10 10–12 13–15 16+
Pears <10 10–12 13–15 16+
Persimmons <14 14–17 18–22 23+
Pineapple <10 10–13 14–17 18+
Plums <10 10–12 13–15 16+
Pomegranates <12 12–14 15–17 18+
Raspberries <8 8–10 11–13 14+
Strawberries <7 7–9 10–12 13+
Tangerines <9 9–11 12–14 15+
Watermelon <8 8–10 11–13 14+

Vegetable %Brix Chart

Vegetable Poor Fair Good Excellent
Asparagus <4 4–5 6–7 8+
Beets <8 8–10 11–13 14+
Bell Peppers <4 4–6 7–9 10+
Broccoli <6 6–8 9–11 12+
Brussels Sprouts <7 7–9 10–12 13+
Cabbage <6 6–8 9–11 12+
Carrots <6 6–8 9–11 12+
Cauliflower <5 5–7 8–10 11+
Celery <5 5–7 8–10 11+
Corn (Sweet) <10 10–14 15–18 19+
Cucumbers <3 3–4 5–6 7+
Eggplant <4 4–5 6–7 8+
Garlic <18 18–22 23–28 29+
Green Beans <4 4–6 7–9 10+
Kale <7 7–9 10–12 13+
Lettuce <3 3–5 6–8 9+
Mushrooms <4 4–6 7–9 10+
Onions <8 8–10 11–13 14+
Peas <8 8–10 11–13 14+
Potatoes <5 5–7 8–10 11+
Pumpkins <8 8–10 11–13 14+
Radishes <4 4–6 7–9 10+
Spinach <5 5–7 8–10 11+
Sweet Potatoes <8 8–10 11–13 14+
Tomatoes <4 4–6 7–9 10+
Turnips <5 5–7 8–10 11+
Zucchini <3 3–4 5–6 7+

Grass & Forage %Brix Chart

Grass / Forage Poor Fair Good Excellent
Alfalfa <8 8–11 12–16 17+
Bahia Grass <4 4–6 7–9 10+
Barley Fodder <10 10–13 14–17 18+
Bermuda Grass <4 4–6 7–9 10+
Clover <8 8–10 11–14 15+
Corn Silage <6 6–9 10–13 14+
Fescue <5 5–7 8–10 11+
Haylage <6 6–8 9–12 13+
Oat Grass <8 8–11 12–15 16+
Orchard Grass <5 5–7 8–10 11+
Pasture Mix <5 5–7 8–11 12+
Rye Grass <6 6–8 9–12 13+
Sorghum <6 6–9 10–13 14+
Timothy Hay <5 5–7 8–10 11+
Wheat Grass <10 10–13 14–17 18+

Typical %Brix Quality Trend

The chart below shows the approximate average Brix thresholds that define the four quality zones across produce categories.

Typical Crop Quality Zones by °Brix

Approximate average refractometer ranges used to classify crop quality across fruits, vegetables, and forage grasses.


0 °Bx5 °Bx10 °Bx15 °Bx20 °BxPoorFairGoodExcellent

What High °Brix Usually Indicates

Higher Brix crops are often associated with:

  • Higher calcium and mineral content
  • Better photosynthesis efficiency
  • More complete carbohydrate production
  • Improved flavor and aroma
  • Longer storage life
  • Reduced fungal pressure
  • Improved resistance to insects
  • Better livestock feed efficiency in forage crops

In forage agriculture, high-Brix grasses are frequently linked to:

  • Increased milk production
  • Better weight gain
  • Improved digestibility
  • Reduced supplemental feed requirements

Important Notes About Brix Readings

Brix values can vary significantly depending on:

  • Variety/cultivar
  • Soil health
  • Irrigation practices
  • Fertility program
  • Sunlight exposure
  • Harvest timing
  • Weather conditions
  • Plant maturity

For best accuracy:

  1. Test fresh juice immediately after sampling
  2. Calibrate the refractometer with distilled water before use
  3. Measure multiple samples across the crop
  4. Test at consistent times of day

Commercial growers often use refractometers as a fast field tool for:

  • Harvest timing
  • Nutrient management
  • Fertility balancing
  • Crop quality grading
  • Livestock forage evaluation
  • Sugar accumulation monitoring
  • Irrigation optimization

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