A free tool from Modern Well
Find out how much and what you actually need to eat — and what's been getting in the way.
Most nutrition plans fail not because the numbers are wrong, but because the plan never accounted for your actual life. This tool gives you a personalized calorie and hand portion starting point, then helps you see exactly where your current life is ready — and where it isn't — so you can start with what's actually possible, build from there, and make progress that doesn't disappear when life gets busy.
Step 1 · Your profile
Start with where you are right now and where you want to go:
Goal for this season
Step 2 · Your movement
Workouts matter, but so does the life around them.
Why these numbers are useful — and why the hand portions matter
This calculator gives you a starting point built from an evidence-informed calorie estimate, adjusted for your activity level, your movement, and your goal. It is not pretending your body is a machine. It gives you a realistic range so you have a place to begin.
The hand portions are matched as closely as possible to the calorie and macro targets behind your result. They are not a rough shortcut — they are a practical translation from numbers into meals you can build without weighing anything.
The most important part is still your real life. Even accurate numbers will be hard to follow if your life is not ready to support them. That is why your RWA result matters — it tells you whether the next step should be a target, a simpler structure, more support, or a smaller starting point.
Common questions
Is the calculator based on real science?
Yes. The calculator uses the Mifflin-St Jeor equation, an evidence-informed method for estimating calorie needs when direct laboratory measurement is not available. Like all nutrition calculators, it produces an estimate rather than a guarantee — which is why the result is shown as a range.
Can I trust hand portions?
The hand portions are matched to the calorie and macro targets behind your specific result. They are meant to make the numbers usable at real meals — especially when weighing and tracking everything is not realistic. They are calibrated, not guessed.
Why does the RWA score matter?
Because numbers only help when your life can support the behavior. The RWA assessment helps you see whether your best first step is a nutrition target, a simpler meal structure, a skill-building focus, or additional support. Skipping this step is why most plans fail in week two.
About the person behind this tool
I'm Simrit Gill — a Registered Nutritionist and Certified Habit Transformation Coach, and the founder of the Modern Well program and the Chain of Habits™ framework.
Most of the people I work with already know what they should be eating. The problem is never the information — it's that the plan doesn't survive contact with their actual life. My approach starts with your real numbers, your real readiness, and the smallest change that can actually stick. Not a program you follow for eight weeks and abandon. A foundation you build on.
I work 1-1 with people who are done starting over.
1-1 coaching invitation
Want help turning this into a plan that fits your real life?
If your results gave you clarity but you are not sure how to turn them into daily structure, 1-1 coaching can help. I work alongside you to build a personalized plan with clarity, structure, and accountability — starting with your goals, then customizing your calorie intake, meal planning, and daily habits so the plan fits your current life while still moving you forward.
Leave your name and email below and I will contact you within 24 hours.