Lean Body Mass Calculator

Lean body mass is what your body would weight if you didn't have any body fat; that means it counts all the organs, bones, muscles, blood and skin, and everything else which is not fat but has mass.

Katch-McArdle Calculator

This Katch-McArdle calculator is another tool that can help you keep healthy and fit. The Katch-McArdle formula allows you to calculate your Basal Metabolic Weight, (BMR), which is the minimum amount of calories your body needs per day to keep functioning, assuming you were to do no exercise for that day. This equation differs from the Harris-Benedict equation because it takes into account lean body mass.

Harris-Benedict Calculator

The Harris-Benedict Calculator helps you determine your total daily energy expenditure based on your BMR and an activity factor using the Harris Benedict Equation.

FFMI Calculator (Fat-Free Mass Index)

This FFMI calculator is dedicated to estimating Fat-Free Mass Index of your body. This method is more precise in comparison to the BMI (Body Mass Index) and overcomes its shortcomings when dealing with people who are well trained, as well as professional sportsmen. In the article below you can find an explanation of what is FFMI, the comparison of BMI vs FFMI, and the FFMI scale which allows you to classify your results.

BMR Calculator (Basal Metabolic Rate, Mifflin St Jeor Equation)

This BMR Calculator helps you to calculate how many calories your body needs if you were only to rest for the whole day. Based on your age, height, weight, and gender, the Basal Metabolic Rate Calculator returns your BMR score.

Waist to Hip Ratio Calculator

Waist to Hip Ratio Calculator estimates the dimensionless ratio of the circumference of the waist to that of the hips. Scroll down if you wonder what conclusion you might draw from your waist-hip ratio or how to measure waist and hips properly!

IW Calculator - Ideal Weight Calculator

The ideal weight calculator is a tool to hep you know how much you should weigh. It will help you determine your ideal body weight based on your height and gender. We will help you to learn the different formulas for calculating your IBW (ideal body weight) and how to interpret the results. You will also learn about how to use the healthy weight chart, which is based on BMI.

BAI Formula - Body Adiposity Index

BAI calculator is an excellent tool for all people who want to keep their bodies healthy and fit. With its help, you will check your body adiposity index and find if your BAI is within a healthy body fat level. We will study what is BAI, how to calculate body fat percentage and see the ranges for underweight, healthy, overweight, and obese.

BF Mass - Body Fat Percentage

This body fat calculator is a tool designed to help you estimate what percentage of your total body weight is body fat.

BMI Formula Body Mass Index

Calculate online your BMI (Body mass index) based on your height and weight. Find out now if you are of healthy weight.

Length Converter

This length converter is a tool that enables quick conversion between length units in both imperial and metric, but not only that. It's equipped with twenty different units of length measurement:

  • ångström (Å)
  • picometers (pm)
  • nanometers (nm)
  • micrometers (μm)
  • millimeters (mm)
  • centimeters (cm)
  • decimeters (dm)
  • meters (m)
  • meters and centimeters
  • kilometers (km)


  • thousandths of an inch (mil / thou)
  • inches (in)
  • feet (ft)
  • feet and inches
  • yards (yd)
  • miles (mi)


  • nautical miles (nmi)
  • Sun radii (R☉)
  • light years (ly)
  • astronomical units (au)
  • parsecs (pc)

This length conversion calculator works by typing units (up to 11 in the same calculation) into the tool. The length converter then returns your results in each unit in real time. Click on the unit name if you want to perform length conversion to a different unit than the default ones chosen by the Omni team. If you are looking to convert between units of area, another tool we would recommend is the square footage calculator.

Cross Price Elasticity Calculator

This cross-price elasticity calculator helps you to determine the correlation between the price of one product and the quantity sold of a different product. Thanks to this tool, you will be able to immediately tell whether two products are substitute goods, complementary goods, or maybe entirely uncorrelated products. In this article, we will provide you with a cross-price elasticity formula and show you an example of step-by-step calculations.

Once you have learned how to calculate the cross price elasticity of demand, we recommend taking a look at the optimal price calculator.