Isotonics / buying notes

Isotonics: before you order

Powder, tablets and ready-mixed bottles have different pack sizes. Use the mixing instructions to work out the prepared volume before comparing costs.

Write down the amount of powder or number of tablets per serving, and the volume of water stated on the label. Multiply that prepared volume by the number of servings in the pack.

Keep nutrition figures on the same basis: per serving or per 100 ml. The calculator compares quantities and prices; it does not decide what or how much you should drink.

Keep these details together

• Powder per serving
• Prepared volume
• Servings per pack

Editorial notes updated 14 November 2026. Retailer observations retain their own dates.