Rex says
Same equations the textbooks use — just way less awkward. Pop in your stats and I'll tell you what the number actually means for you.
Try a scenario
Click to load — tweak from there.Inputs
Result
Maintain weight
2,345
calories/day
Mild loss (~0.25 kg/wk)
2,095
Weight loss (~0.5 kg/wk)
1,845
Extreme loss (~1 kg/wk)
1,345
Weight gain (~0.5 kg/wk)
2,845
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter units.
- 2Enter sex.
- 3Enter age (years).
- 4Enter weight.
- 5Enter height.
- 6Enter activity level.
- 7Read your maintain weight on the right — it updates as you type.
- 8Hit Share to keep the scenario or send it to someone.
About this calculator
Estimates daily calorie targets for maintenance, weight loss, and weight gain using Mifflin-St Jeor + activity factor.