Free calculators
Know your numbers.
Six quick calculators with the same science as the Fullday app, each with its sources. They run in your browser: nothing is sent anywhere or saved.
The calculators
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Protein
Grams a day by weight and goal
Your daily protein from your weight and goal, the ISSN way, with a fair number at a high BMI.
Open the calculator -
Sleep
Hours by age, and a bedtime
How much sleep your age needs, and when to be asleep for the time you have to get up.
Open the calculator -
Calories
Maintenance and goal calories
Resting energy, maintenance and a gentle target for losing, keeping or gaining, with floors it never goes under.
Open the calculator -
Heart-rate zones
Five zones from age and resting HR
Five training zones from your age, fitted to you with your resting heart rate.
Open the calculator -
Water
A day's fluid by weight and training
A day's fluid from your weight, plus what today's training sweat asks for.
Open the calculator -
One-rep max
Estimated 1RM and a % chart
Your estimated one-rep max from a set of reps, and the weight at every percentage of it.
Open the calculator
General wellness guidance, not medical advice. Talk to a doctor about any health concern, and before changing how you eat or train if you're under 18, pregnant or have a medical condition.
Fullday tracks these for you every day.
Your protein, calories, water, sleep need and heart-rate zones, worked out from your profile and kept up to date. Coming to the App Store this December, free to download.
Pre-orders open soon.
Email us for a note when they open