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Logging ketones

Got a meter? A real reading beats any AI guess — and the battery knows it.

The Ketosis Battery normally infers ketosis from your food. But if you test with a meter, you can log the actual number — and a real measurement overrides the estimate, because hard data beats a well-educated guess every time.

1. Turn it on

One toggle, once

Ketone logging is tucked away by default so it doesn't clutter things up for people without a meter. To switch it on, head to Profile → Preferences and enable "I have a ketone meter". That adds Log Ketones to your quick-action menu.

2. Log a reading

  1. Tap the green + button on the Home or Diary tab.
  2. Tap Log Ketones.
  3. Choose Blood, Urine, or Breath at the top.
  4. Enter your reading, adjust the time if it wasn't just now, add a note if you like, and tap Save Measurement.
The Log Ketone Measurement screen on the Blood tab, with a Blood Ketone Level field in mmol/L, a measurement time of Jun 20 2026 at 10:18 AM, and an optional notes field.
Blood: enter a value in mmol/L. There's room for the date, time, and a note.

Blood

The gold standard. Enter your meter's reading in mmol/L (0.0–8.0). The optimal ketosis range is shown right under the field: 0.5–3.0 mmol/L.

The Log Ketone Measurement screen on the Urine tab, with preset buttons for Negative, Trace, Small, Moderate and Large matching test-strip colours.
Urine: just match your strip to one of the preset levels.

Urine

Using strips? No squinting at decimals — tap the preset that matches your strip colour: Negative, Trace, Small, Moderate, or Large. We translate it to a value for you.

Breath

Breath analyser? Switch to the Breath tab and enter the reading in PPM. A typical ketosis range is roughly 2–40 PPM.

Editing or deleting a reading

Ketone readings appear in your diary with a little droplet icon. Tap one to edit it, or use the red Delete Measurement button (it'll ask you to confirm first).

3. What the numbers mean

The Stats screen showing a Ketone Measurements summary with average, peak and latest readings, and a ranges legend from not in ketosis to excessive.
Your readings, summarised on the Stats screen with a handy ranges legend.

For blood ketones (mmol/L), the rough guide the app uses:

  • Below 0.5 — not in ketosis.
  • 0.5–1.0 — light ketosis (fat-burning started).
  • 1.0–3.0 — optimal nutritional ketosis.
  • Above 3.0 — excessive; worth checking in with a doctor if it's sustained.

Log a few and the Stats screen tracks your average, peak, and latest, with the optimal band marked on the chart.

4. How it affects the battery

A logged reading doesn't just sit there looking pretty. The Ketosis Battery leans on it heavily:

  • A reading in the 0.5–3.0 range pushes the score up and largely overrides the food-based estimate — even some hidden-carb guesswork.
  • A reading below 0.5 pulls the score down, even if your carbs looked perfect on paper.
  • Recent readings also quiet the alcohol penalty — proof beats assumption.
You don't need a meter

KetoLens works perfectly well on food logging alone — most people never test. Ketones are there for the data nerds and anyone who wants to remove the guesswork. Totally optional.

Next: everything you log lands in your diary — and starts revealing patterns.