The 5% to 20% rule is a quick guideline from the FDA for reading nutrition labels. It uses the Percent Daily Value (%DV) column on the Nutrition Facts panel to help you instantly judge whether a food is high or low in a given nutrient: 5% DV or less per serving is considered low, and 20% DV or more per serving is considered high. Anything between 5% and 20% falls in a moderate range.
How the Rule Works
Every packaged food in the U.S. carries a Nutrition Facts label with a %DV column on the right side. That percentage tells you how much of your recommended daily intake one serving of the food delivers. The 5/20 rule turns that number into a fast yes-or-no decision: glance at the %DV, and you know whether a serving contributes a meaningful amount of that nutrient or barely registers.
For nutrients you want less of, look for numbers at or below 5%. For nutrients you want more of, look for numbers at or above 20%. This works whether you’re scanning a single product or comparing two brands side by side in the grocery aisle.
Nutrients to Keep Low
The FDA specifically recommends choosing foods lower in three nutrients: saturated fat, sodium, and added sugars. These are the nutrients most closely linked to chronic health problems like heart disease and type 2 diabetes when consumed in excess. When you see a %DV of 5% or less for any of these on a label, that food is a low source. If you see 20% or more, that single serving is delivering a significant chunk of your daily limit.
To put this in perspective, a frozen meal with 30% DV for sodium provides nearly a third of all the sodium you should eat in a day, in one sitting. Spotting that number quickly helps you decide whether the tradeoff is worth it or whether a competing product with 10% DV is a better pick.
Nutrients to Get More Of
The same rule works in reverse for nutrients most people don’t get enough of. Dietary fiber, calcium, iron, potassium, and vitamin D are all listed on current labels, and aiming for 20% DV or higher per serving helps you build meals that fill common gaps in the average American diet. A cereal with 25% DV for iron, for example, is a genuinely good source, while one listing 3% DV barely contributes.
The updated Nutrition Facts label now requires manufacturers to list the actual amount in milligrams or micrograms alongside the %DV for vitamin D, calcium, iron, and potassium. This gives you both the quick snapshot (the percentage) and the precise quantity if you need it.
What the Percentages Are Based On
All Percent Daily Values are calculated from a 2,000-calorie daily diet. That number is a general reference point, not a personalized recommendation. If you eat significantly more or less than 2,000 calories a day, the actual percentage your body needs will shift accordingly. Someone eating 1,500 calories would hit their targets with smaller amounts, so a food showing 15% DV might actually represent a larger share of their real needs. Someone eating 2,500 calories has a bit more room.
Even if 2,000 calories doesn’t match your intake exactly, the 5/20 rule still works well for comparing products. Two brands of yogurt sitting next to each other on a shelf will both use the same 2,000-calorie baseline, so the %DV numbers give you a reliable apples-to-apples comparison regardless of your personal calorie target.
Nutrients Without a %DV
Not every line on the label includes a percentage, which means the 5/20 rule can’t be applied to everything. Three notable exceptions:
- Trans fat has no established Daily Value because scientists have not identified a safe reference intake level. It’s listed in grams only, and the general guidance is to keep it as close to zero as possible.
- Total sugars also lacks a %DV because no recommendation exists for total sugar consumption in a day. Added sugars, however, do carry a %DV on the current label, so you can apply the 5/20 rule to added sugars specifically.
- Protein is only required to show a %DV when the manufacturer makes a protein-related claim (like “high in protein”) or when the product is intended for children under four. For most products aimed at the general population, protein appears in grams without a percentage. This is partly because protein deficiency is not a widespread public health concern in the U.S.
Using the Rule While Shopping
The most practical way to use the 5/20 rule is as a comparison tool. When you’re choosing between two similar products, flip them over and look at the %DV column. You don’t need to calculate anything or memorize daily limits. If one pasta sauce shows 8% DV for sodium and another shows 22%, you can see instantly which one is the lower-sodium option without converting milligrams in your head.
Pay attention to the serving size at the top of the label before comparing. The updated Nutrition Facts format uses larger, bolder type for serving size and calorie count, making this easier to spot. Some packages that could reasonably be eaten in one sitting now require “dual column” labels showing values per serving and per entire package. If you know you’ll eat the whole container, use the per-package column for your 5/20 check.
The rule is deliberately simple, and that’s its strength. You don’t need to memorize how many milligrams of sodium or grams of fiber you should eat each day. The %DV does that math for you, and the 5% and 20% thresholds give you clear goalposts to aim for.