Body Metrics & Fitness4 options compared

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

Estimates Basal Metabolic Rate (BMR), which represents the number of calories the body burns at rest, using established formulas such as the Mifflin-St Jeor Equation. The tool allows users to input personal metrics and selects from various calculation methods to determine daily energy needs. It also provides an estimate of total daily calorie expenditure by factoring in different activity levels,...

Dietary calculators
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  1. Screenshot of Omni Calculator
    02
    Omni Calculator
    omnicalculator.com

    Use the BMR calculator to determine how many calories you should consume while resting all day, and learn how much en...

    Open siteView details
  2. Screenshot of Bodybuilding.com
    03
    Bodybuilding.com
    bodybuilding.com

    This free BMR calculator estimates resting calorie burn from age, sex, height, and weight. It is paired with practica...

    Open siteView details

Side by side

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

ToolBest forStrengthsLimitations
Calculator.net
calculator.net
People who want formula variety and unit options
  • Multiple formulas (Mifflin-St Jeor, Harris-Benedict, Katch-McArdle)
  • US and metric unit support
  • Activity-level calorie estimates included
  • Age range limited to 15-80
  • No body fat percentage input
Omni Calculator
omnicalculator.com
Users who want a clean, educational interface
  • Simple rest-calorie focus
  • Theoretical background on BMR formulas
  • No paid plan required
  • Fewer formula options than Calculator.net
  • Activity multiplier not prominently featured on the main screen
Bodybuilding.com
bodybuilding.com
People who want calorie targets tied to weight-loss or training goals
  • Paired with practical next-step guidance for calorie targets and training
  • Free to use without required subscription
  • Site is heavily interspersed with shopping and promotional content
  • Calculator page contains prominent affiliate links
TDEECalculator.net
tdeecalculator.net
People who want total daily energy expenditure with BMR as part of a larger pict
  • Estimates TDEE in addition to BMR
  • Mifflin-St Jeor formula at core with optional body-fat adjustments
  • No signup or payment required
  • Fewer formula options; only Mifflin-St Jeor core
  • Activity levels are predefined categories rather than continuous input

Buyer's guide

How to choose a bmr calculator (basal metabolic rate, mifflin st jeor equation)

When picking a BMR calculator, first decide whether you need only a resting calorie estimate or also a total daily energy expenditure figure that factors in your typical activity level. If you want to compare different calculation methods, choose a tool that lists multiple formulas such as Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle, since results can vary noticeably between them. If you are tracking body composition, look for an option that allows body fat percentage input, as lean mass formulas like Katch-McArdle can be more accurate for active users. Otherwise, a simple calculator with unit flexibility and clear activity multipliers will serve most people best.

Questions

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

What is the difference between BMR and TDEE?
BMR is the number of calories your body burns at complete rest, while TDEE includes all daily activity and can be significantly higher. Some calculators show both values in one result.
Why do different BMR calculators give different results?
Calculators use different formulas — Mifflin-St Jeor, Harris-Benedict, Katch-McArdle — and some include body fat percentage or activity multipliers, which affects the final number.
Can I use these calculators if I am very active or an athlete?
Yes, but look for a tool that lets you input activity level or body fat percentage, as standard BMR equations were designed for average populations and may underestimate needs for highly active people.
Do I need to convert my height and weight to metric units?
Most calculators support both US and metric units, so you can enter your numbers in the system you use daily without converting.
Is the Mifflin-St Jeor equation more accurate than older formulas?
Mifflin-St Jeor is currently considered the most accurate BMR equation for most people, especially when compared to the older Harris-Benedict formula, but individual results can still vary based on body composition.
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