Am I dehydrated? This free hydration self-check uses the urine-colour guide to give a general signal, with clear red-flag signs that mean you should get medical help — informational only, not a diagnosis.
Which best matches your urine colour?
A rough guide used in sport and clinics: paler usually means better hydrated. Some vitamins, foods and medicines can change urine colour.
- Confusion, drowsiness, dizziness or fainting
- A rapid heartbeat or rapid breathing
- Very little or no urine, or sunken eyes
- No tears, or a sunken soft spot in a baby
- Ongoing vomiting or diarrhoea, or inability to keep fluids down
These can signal significant dehydration, which needs prompt medical care — don’t wait.
General information, not medical advice. For most mild cases, sipping water or an oral rehydration drink and resting in a cool place helps — but if you’re worried, or symptoms are severe, get medical help.
How the Dehydration Level Calculator Works
This tool gives a general hydration self-check using the urine-colour guide widely used in sport and clinics: you pick the shade closest to your own, and it returns a plain-language signal and general advice. It cannot measure dehydration medically and is not a diagnosis.
Formula: Hydration signal = lookup(swatch), where swatch is one of 8 shades ordered from palest (1) to darkest (8) on a fixed urine-colour scale. Shades 1-2 map to “Well hydrated,” shade 3 to “Fine – sip a little more,” shades 4-5 to “Drink some/more water,” shade 6 to “Drink fluids & watch symptoms,” and shades 7-8 to “Rehydrate & check red flags.” There is no numeric calculation — it’s a direct colour-to-signal match.
- Urine colour swatch — the one of 8 shades (numbered 1, palest, through 8, darkest) that most closely matches your own urine colour.
Example Scenarios
| Swatch # | Approx. Colour | Hydration Signal |
|---|---|---|
| 1 | Very pale yellow | Well hydrated |
| 3 | Light-medium yellow | Fine – sip a little more |
| 4 | Medium yellow | Drink some water |
| 5 | Darker yellow / amber | Drink water now |
| 6 | Amber / honey | Drink fluids & watch symptoms |
| 8 | Dark brown / tea-coloured | Rehydrate – seek advice if unwell |
Dehydration Level Calculator FAQ
Is this a medical diagnosis of dehydration?
No. This is a general hydration self-check based on urine colour, not a clinical measurement or diagnosis. It can give a rough signal, but genuine dehydration needs to be assessed by a healthcare professional, especially if symptoms are severe.Can vitamins or medication change my urine colour and throw off the result?
Yes. Certain vitamins (like B vitamins), some foods (such as beets), and various medicines can turn urine bright yellow, pink, or other colours unrelated to hydration. If you take supplements or medication regularly, treat the colour signal as a rough guide rather than a precise reading.What are the red-flag signs I shouldn’t ignore?
Confusion, drowsiness or fainting, a rapid heartbeat or breathing, very little or no urine, sunken eyes, no tears or a sunken soft spot in a baby, and ongoing vomiting or diarrhea are all signs that need prompt medical attention — don’t wait to see if they improve on their own.Why does darker urine usually suggest I need more fluids?
As the body conserves water, urine becomes more concentrated and takes on a darker yellow or amber colour. Paler urine generally reflects better hydration, though it’s a rough guide rather than an exact medical measurement.Does this apply the same way to babies, children, and older adults?
The general colour-based idea is similar, but babies, young children and older adults can become dehydrated more quickly and may show different warning signs, such as a sunken soft spot in an infant. Check the red-flag list and seek medical help sooner for these groups if anything seems off.What should I do if I pick one of the darker shades (6-8)?
Start drinking water or an oral rehydration drink and keep sipping. If you feel unwell, have other symptoms, or the colour doesn’t improve, review the red-flag box and consider seeking medical advice rather than waiting it out.Related Calculators
To stay ahead of dehydration day-to-day, try the water intake calculator for a general daily fluid target, check your daily sodium intake since sodium balance affects fluid retention, or track patterns over time with the blood pressure tracker.