Vitamin K Intake Calculator
Vitamin K mcg from food and pills against RDA.
What it does
Vitamin K steers clotting and bone math on micrograms a day: 90 for women, 120 for men, with leafy greens delivering hundreds per serving. Warfarin users track stability, not just totals.
The tool above takes leafy and other servings with pill mcg by life stage. It returns total mcg, the RDA share, and the safety note.
The default woman with one leafy serving totals 300 mcg, or 333% of RDA. Zeros read flat while pill cases add exact label amounts.
Supplement guidance fixes the 120/90 ladder with no upper limit set. Federal labeling repeats 120 mcg as the Daily Value behind panels.
Greens dominate the math so completely that consistency matters most for thinner patients. Sudden kale binges swing INR further than steady salads ever will.
How to use
- Pick the life stage.
- Type leafy servings.
- Type other servings.
- Type supplement mcg.
- Read total first.
- Read share and safety beside it.
Formula
- leafy
- Leafy green servings near 300.
- other
- Other food servings near 50.
- RDA
- 120 men, 90 women and pregnancy.
NIH Office of Dietary Supplements sets adult RDA at 120 men and 90 women with 90 pregnancy and lactation, and no upper limit. Federal Daily Value rules list 120 mcg for labeling. Produce factors are planning estimates; pills read exact from labels.
Worked example
Example: spinach habit
Defaults: woman, 1 leafy serving.
- Eater: woman, 1 leafy serving.
- Leafy: 1 x 300 = 300 mcg phylloquinone.
- Total: 300 mcg against 90 RDA.
- Share: 300 / 90 = 333% of RDA.
- Safety: no UL set; warfarin users consult.
- Tool shows 300 mcg, 333% of RDA, No UL set; warfarin users consult.
Reference table
| Group | RDA | UL |
|---|---|---|
| Men | 120 | None set |
| Women | 90 | None set |
| Pregnancy | 90 | None set |
| Lactating | 90 | None set |
Limits
- Estimates; produce varies.
- K1 and K2 merged here.
- Not a clotting workup.
- Labels beat planning factors.
Common mistakes
- Bingeing greens on warfarin.
- Ignoring K in multivitamins.
- Counting iceberg like kale.
- Skipping INR checks.
- Self dosing clotting signs.
Try it yourself
Quick checks. Answers sit tucked under each question.
Man, zeros across?
0 mcg, 0% of RDA, no UL set but far under goal.
Supplement 500 mcg?
500 mcg pill reads exact: check family totals against it.
Pill 99,999 mcg?
Past 50,000 mcg pills exceed entry bounds: read the label and retry.
Questions
How much daily?
Men 120, women 90, pregnancy 90, lactating 90 mcg. No upper limit is set.
Sources counted?
Kale, spinach, and collards lead near 300 a serving; other veg trail near 50.
K1 and K2?
Yes, K1 from plants and K2 from ferments and animal foods both count here.
Warfarin interaction?
Clotting factors need it, so warfarin dosing tracks intake stability. Sudden jumps shift INR.
Diagnose issues?
No, this estimates intake. Bleeding and clotting need labs and clinicians.
Gut supply?
Yes, gut bacteria make menaquinones, but diet still decides the total.
Sources
- NIH Office of Dietary Supplements: vitamin K fact sheet
- 21 CFR 101.36: Daily Value 120 mcg (Cornell LII)