Fresh juice is a convenient way to get vitamin C, but not every juice delivers the same amount. This calculator estimates the vitamin C in your serving based on juice type and volume. Choose from orange, grapefruit, lemon, lime, pineapple, tomato or cranberry cocktail, or enter a custom value from your own label. The tool converts your serving size into milliliters, then reports total vitamin C in milligrams and its share of the U.S. FDA Daily Value (90 mg).
Vitamin C is water-soluble and sensitive to heat, light and oxygen, so bottled or pasteurized juices may contain less than freshly squeezed versions. That is why the custom option is useful: if your juice label lists vitamin C per 100 ml, you can get a much more accurate estimate than a generic average.
Use this calculator for meal planning, diet tracking, or simply comparing juice brands. A standard 240 ml glass of orange juice typically covers more than 100% of the Daily Value, while a glass of apple juice provides only a trace.
Estimate the vitamin C in your glass of juice and see what share of your daily need it covers.
1️⃣ Choose your juice
2️⃣ Enter serving size
Step-by-Step Guide
Start by selecting the juice you poured from the dropdown menu. If the bottle or carton in your fridge lists vitamin C on its nutrition label, choose "Custom juice" instead — that option lets you type in the exact value printed on the label, which is the most accurate route because it accounts for fortification and brand differences.
Next, enter the serving size you actually drank and choose the matching unit: milliliters (ml), US fluid ounces (fl oz), US cups, or liters. Many standard glasses hold about 240 ml (8 fl oz) and single-serving bottles are often 350 ml or 500 ml — the calculator works with any amount you pour.
Press Calculate to see your results. The tool reports total vitamin C in milligrams, the share of the 90 mg Daily Value, and a four-step breakdown showing the conversion math. Use Reset to clear the form and start a new comparison.
How the Calculation Works
The calculator works in three stages. First, it converts your serving size into milliliters so every volume can be compared on the same scale. The conversion factors used are 1 US fl oz = 29.5735 ml, 1 US cup = 236.588 ml, and 1 L = 1000 ml; milliliter entries are used as-is.
Second, it multiplies the volume by the vitamin C density of the selected juice:
Vitamin C (mg) = Serving (ml) × Vitamin C per 100 ml ÷ 100
Finally, it divides by the FDA Daily Value of 90 mg and multiplies by 100 to express the result as a percentage:
% Daily Value = Vitamin C (mg) ÷ 90 × 100
The built-in averages come from USDA FoodData Central records for raw and commercial juices. Because vitamin C is sensitive to heat, light and oxygen, real values depend on fruit ripeness, variety, season, pasteurization, and how long the container has been open.
Worked Examples
Standard Vitamin C Values
The table below shows the natural average vitamin C content used by the calculator, based on USDA FoodData Central entries for common juices. Use these figures when you do not have a nutrition label handy, or compare them with the label on your own carton.
| Juice | Vitamin C (mg per 100 ml) |
|---|---|
| Orange juice, fresh | 50 |
| Lemon juice, fresh | 39 |
| Grapefruit juice | 34 |
| Lime juice, fresh | 29 |
| Cranberry juice cocktail | 25 |
| Tomato juice | 18 |
| Pineapple juice | 10 |
| Apple juice | 1 |
| Grape juice | 1 |
Natural averages only — fortified, blended or "light" juices can differ substantially. Citrus juices are the richest natural sources, while apple and grape juice contain only traces.
Tips & Best Practices
- Drink freshly squeezed juice soon after making it — vitamin C begins to degrade on contact with air, and heat and light accelerate the loss.
- Refrigerate opened juice and finish it within a few days. The longer a container sits, the lower the vitamin C level becomes.
- Use the Custom option whenever your label lists vitamin C. Labels reflect the actual product, including fortification, and give the most accurate estimate.
- Compare brands before buying. Amounts can vary more than twofold across brands of the same juice type, so check the nutrition panel.
- Remember that juicing removes most of the fiber found in whole fruit — pair juice with whole fruit for a balanced approach.
- If you track nutrients for a medical or dietary goal, ask a healthcare professional about the right vitamin C target for your situation.
Frequently Asked Questions
Why does my juice label show more vitamin C than the calculator? Many commercial juices are fortified with added ascorbic acid, pushing levels to 60–100 mg per 100 ml or higher. The built-in values reflect natural vitamin C only, so a fortified product will always exceed them.
Is 90 mg the right Daily Value for me? The FDA uses 90 mg as the Daily Value for adults and children aged 4 and older, which is the benchmark this calculator reports. Individual recommendations differ: the National Institutes of Health suggest 75 mg per day for adult women and 90 mg for adult men, with more during pregnancy and breastfeeding. See the NIH vitamin C fact sheet for full guidance.
Does pasteurization destroy vitamin C? Partially. Heat reduces vitamin C content, which is one reason fresh-squeezed juice usually contains more than shelf-stable bottled juice from the same fruit. Refrigerated "not from concentrate" juices typically fall somewhere in between.
Why do two brands of orange juice give different results? Vitamin C varies with orange variety, ripeness at harvest, climate, processing temperature and storage time. USDA averages describe typical juice, not every carton.
Can I get too much vitamin C from juice? Toxicity is rare because vitamin C is water-soluble and excess is excreted in urine. Only very high intakes above 2000 mg per day cause digestive upset, which is impractical to reach through juice alone.