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Fast Forward Nutrition

The FORWARD Method™

Daily Hydration Estimator

Estimate your general daily fluid reference, compare it with what you currently drink and identify factors that may change your hydration needs.

This tool provides a general starting point. Hydration needs vary with activity, sweat losses, climate, health, medications, pregnancy, breastfeeding and individual circumstances.

General daily fluid reference

  • Male2.6L / day
  • Female2.1L / day
  • Pregnancy (19–50)2.3L / day
  • Breastfeeding (19–50)2.6L / day

Fluid from drinks is the amount above — plain water, milk and other beverages. Some of your daily water also comes from food, so your total water from food and drinks is higher. The figure this tool compares against is the reference for fluids from drinks, because that is what you can reasonably match to your recorded beverages.

Your details

years

This estimator is designed for adults aged 18 and over.

Sex assigned at birth

This calculator uses reference values based on sex assigned at birth because the underlying research and reference values were developed using these biological characteristics.

Typical conditions

Select any that usually apply. These do not add a precise amount to your reference — they help flag when a generic estimate may underestimate your individual needs.

Exercise on a typical active day

Choose the option closest to a usual active day. This does not prescribe litres per hour.

What do you usually drink in a day?

Enter approximate amounts in millilitres (mL). A standard cup is approximately 250 mL. A typical reusable bottle may hold 500–750 mL. Leave anything you don't drink at 0.

Optional bottle converter

Work out the volume of your bottles, then add it to the Plain water field. This replaces the plain-water entry rather than adding to it, so it is not double-counted.

mL
bottles

Enter a bottle size and count to see the total.

Stop guessing. Start moving FORWARD.

For personalised nutrition advice based on your health, lifestyle and goals, explore The FORWARD Method™.

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This calculator provides a general population-based fluid reference and a summary of the drinks you entered. It cannot directly measure hydration status, sweat rate, electrolyte losses or individual fluid requirements.

Needs vary with food intake, body size, climate, activity, sweat losses, pregnancy, breastfeeding, illness, medications and health conditions.

The results are general information and are not medical advice, diagnosis, treatment or a personalised hydration prescription.

Do not use this calculator to override a prescribed fluid restriction or advice from a healthcare professional.

Fast Forward Nutrition · The FORWARD Method™

References

  1. Australian and New Zealand Nutrient Reference Values — Water.
  2. Sports Dietitians Australia — guidance noting that exercise hydration needs vary with sweat rate, environmental conditions and individual circumstances.