Enter the fat-free mass (kg) into the Calculator. The calculator will evaluate the Cunningham Equation. 

Cunningham Equation Calorie Formula

RMR = 22*FFM+500


  • RMR is the Cunningham Equation Calorie (calories)
  • FFM is the fat-free mass (kg)

To calculate Cunningham Equation Calories, multiply the fat-free mass by 22, then add 500.

How to Calculate Cunningham Equation Calories?

The following steps outline how to calculate the Cunningham Equation Calorie.

  1. First, determine the fat-free mass (kg). 
  2. Next, gather the formula from above = RMR = 22*FFM+500.
  3. Finally, calculate the Cunningham Equation Calorie.
  4. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

fat-free mass (kg) = 140

Frequently Asked Questions

What is Fat-Free Mass (FFM)?

Fat-Free Mass (FFM) refers to the total mass of all tissues in the body except fat. This includes muscles, bones, organs, and water content. It’s a key variable in calculating various health and fitness indices, including the Cunningham Equation Calorie.

Why is the Cunningham Equation important?

The Cunningham Equation is used to estimate Resting Metabolic Rate (RMR) based on fat-free mass. It’s important for athletes and individuals looking to optimize their diet and exercise regimen by understanding how many calories they burn at rest.

How can I measure my fat-free mass?

Fat-free mass can be measured through various methods such as Dual-Energy X-Ray Absorptiometry (DEXA) scans, bioelectrical impedance analysis (BIA), and skinfold measurements. Each method has its advantages and limitations in terms of accuracy and accessibility.

Can the Cunningham Equation be used for weight loss?

Yes, the Cunningham Equation can be a useful tool for weight loss planning. By estimating the Resting Metabolic Rate (RMR), individuals can tailor their caloric intake and exercise plans to create a calorie deficit, which is necessary for weight loss. However, it’s important to consult a healthcare professional before starting any weight loss program.