Phosphorus Intake Calculator
Score daily phosphorus percent and gap from foods by life stage.
What it does
Phosphorus builds bones beside calcium. Dairy, meat, and grains carry it in amounts that cover most balanced days.
The tool above scores the day. An adult woman target is 700 mg, so 600 mg reads 85.7 % with 100 mg more to find. Teens target 1250 mg for growing bones.
Dairy leads most scores. Milk, yogurt, and cheese stack phosphorus fast, while meat, fish, and nuts fill the rest.
Soda counts the wrong way. Phosphoric acid adds milligrams with zero nutrition, so water drinkers score cleaner.
Calcium partners the mineral. Both need vitamin D and weight bearing movement to reach bones.
How to use
- Pick life stage.
- Enter food phosphorus in mg.
- Read target first.
- Read percent next.
- Read gap and add dairy or nuts.
- Score a week, not one meal.
Formula
- stage
- Life stage setting the target.
- food
- Phosphorus from foods, in mg.
Targets follow NIH ODS recommended intakes. Food mg comes from labels or USDA FoodData entries summed for the day.
Worked example
Example: adult woman, 600 mg from food
Defaults: adult woman eating 600 mg. These are also the default values, so the page opens on this answer.
- Stage: adult woman, target 700 mg.
- Food: 600 mg from dairy and grains.
- Share: 600 / 700 x 100 = 85.7 %.
- Gap: 700 - 600 = 100 mg more.
- Tool shows 700 mg, 85.7 %, 100 mg more.
Reference table
| Stage | Target | Example score |
|---|---|---|
| Child | 500 mg | 400 mg is 80 % |
| Adult woman | 700 mg | 600 mg is 85.7 % |
| Teen | 1250 mg | 1000 mg is 80 % |
| Pregnancy | 700 mg | 650 mg is 92.9 % |
Limits
- Intake scoring only, not medical advice.
- Labels vary by brand.
- Kidney cases need restricted targets.
- Symptoms need clinicians, not math.
Common mistakes
- Scoring one snack instead of the day.
- Counting soda phosphorus as nutrition.
- Skipping dairy with no backup plan.
- Mixing mg and grams on labels.
- Treating percent as a diagnosis.
Try it yourself
Quick checks. Answers sit tucked under each question.
Adult man eating 500 mg?
Target is 700 mg. Share is 500 / 700 x 100 = 71.4 %. Gap is 200 mg more.
Teen eating 1000 mg?
Target is 1250 mg. Share is 1000 / 1250 x 100 = 80 %. Gap is 250 mg more.
Questions
How do I score my day?
Divide food mg by the stage target. Here 600 / 700 x 100 = 85.7 %.
What are the targets?
Kids 500 mg, teens 1250 mg, adults 700 mg.
Which foods carry phosphorus?
Dairy, meat, fish, nuts, and whole grains. A yogurt lunch with nuts covers half the day.
How do I close the gap?
Add dairy, meat, or nuts. Here 100 mg more closes the day.
Does soda count?
Yes. Cola phosphoric acid adds phosphorus with no nutrition, so water beats soda.
Does this diagnose deficiency?
No. Intake scoring only; bone and kidney signs need clinicians.