Water intake calculator

This tool helps you work out how much water you need, to see if it is in the healthy range for your age, activity, environment, height, weight and gender.

Select metric (for metres and centimetres) or standard (for feet and inches).

• Age: select your age group
• Sex: currently this tool only has two genders, so choose the one closely aligned to you
• Height: taken without shoes
• Weight: measure in the morning before you have eaten
• Season: select winter, summer or standard, which is combined for spring and autumn
• Activity level: select your activity from light, moderate or very active