BMR
1,698.75 calories/day
Rates & sources
Population-average body composition metrics. Always consult a qualified clinician before making health decisions.
Source: NHS — Health A-Z — figures refreshed at the start of each tax year.
When to use this calculator
- Before setting a new health goal or checking whether a plan is realistic.
- When you want to compare different assumptions without tracking them manually.
- When you need a quick baseline before discussing the result with a professional.
- When you are starting a new fitness or diet programme and want an objective starting-point measurement.
- When you want to recheck your numbers after several weeks of change to see whether the metrics are moving in the right direction.
A realistic Australia planning example
Use these sample inputs as a quick scenario test, then change one variable at a time to compare outcomes.
Weight (kg)
80 kg
Height (cm)
178 cm
Age
35
Sex (1=Male, 0=Female)
1
After entering these figures, focus on bmr first and then rerun the tool with a more cautious assumption to understand the realistic range of outcomes rather than relying on a single estimate.
How to read your results
BMR
Use this metric to compare scenarios side by side and understand how changes in the key inputs drive the final outcome. If the figure surprises you, isolate one variable at a time and rerun the calculation to identify which assumption is responsible.
Method & assumptionsAuthoritative sources
Basal Metabolic Rate (BMR) represents the minimum number of calories your body requires to sustain essential life functions — heartbeat, respiration, temperature regulation, and cell production — while at complete rest. This calculator uses the Mifflin-St Jeor equation, which is currently recommended as the most accurate predictive equation for most adults. The formula accounts for your sex, weight, height, and age. It is worth understanding that BMR is an estimate based on averages, and individual metabolic rates can differ meaningfully due to factors including thyroid function, gut microbiome, lean muscle mass, and genetics. Your BMR result is a useful planning figure, but it should not replace personalised guidance from a healthcare professional.
Common mistakes
- !Using optimistic assumptions without testing a more cautious scenario as well.
- !Comparing outputs from different tools without checking that the inputs match.
- !Treating the result as a final figure rather than a broad planning indicator.
- !Entering estimated rather than accurately measured height or weight, which can shift BMI or healthy-weight results meaningfully.
- !Interpreting a single metric in isolation instead of reading it alongside the other outputs the tool provides.
What to do next
- Rerun the calculator in six to eight weeks with updated measurements to track progress objectively.
- Use the related health calculators to build a fuller picture before discussing any changes with a professional.
- Open one of the linked guides if you want more context on what the metrics mean and how they relate to each other.
- If a result falls outside the normal range, book a GP appointment to discuss it rather than acting on the figure alone.
- Note the date alongside your results so you have a clear before-and-after record when you recheck later.
Frequently asked
Use arrow keys to navigate items, Enter or Space to expand/collapse.
End-of-article next steps
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