Calculators for Fitness Coaches
Evidence-based tools for client nutrition and fitness planning
Effective coaching starts with accurate baselines. Before you can design a training program or nutrition plan, you need to understand your client's current state and calculate their specific needs. Generic advice does not get results, personalized programming does.
Our health calculators give you the numbers you need for individualized coaching. Calculate BMR and TDEE to set calorie targets, determine healthy weight ranges, and track progress with measurable metrics. When clients see their personalized numbers, they understand the science behind your recommendations.
Why Professionals Choose CalcOnce
Recommended Calculators
Calorie Calculator
Calculate TDEE and set calorie targets for cutting, maintaining, or bulking
BMI Calculator
Assess starting point and set realistic goal ranges
Percentage Calculator
Calculate body fat changes, strength gains, and progress metrics
Date Calculator
Plan program phases and calculate time to goal
“I calculate TDEE for every new client during our first session. It sets realistic expectations and gives them ownership of their nutrition.”
Pro Tips
Start with Maintenance
Calculate TDEE first, then adjust calories up or down by 300-500 based on the goal. Small deficits/surpluses are more sustainable.
Recheck Monthly
As clients lose weight, their TDEE decreases. Recalculate monthly to keep progress moving.
Use BMI as One Data Point
BMI is a starting metric, but track other measurements too. Athletes may have high BMI with low body fat.
Set Realistic Timelines
Use the date calculator to show how long healthy progress takes. 1-2 lbs per week adds up to significant change over months.
Frequently Asked Questions
Which calorie formula do you use?
We use the Mifflin-St Jeor equation, which research has shown to be the most accurate for most people. Activity multipliers follow standard guidelines.
Should I trust BMI for athletes?
BMI has limitations for muscular individuals. Use it as one data point along with measurements, photos, and performance metrics.
How often should I recalculate client needs?
Recalculate TDEE when body weight changes by more than 5-10 lbs, or monthly during active cut/bulk phases.