BMR Reference for Age 25
Basal metabolic rate at age 25 is not one number — it is a range set by height and weight. This page holds the formula inputs steady at age 25 and sweeps body composition instead: four BMI levels, men at 175 cm and women at 165 cm, each estimated with both Mifflin-St Jeor and Harris-Benedict so the spread between the classic equations is visible at a glance.
The 5 kcal-per-year age term is visible in a single comparison: at 76.6 kg this page lists 1740 kcal, while age 24 lists 1745 — 5 kcal below. The gap between Mifflin-St Jeor and Harris-Benedict on the same row is 72 kcal (4.1%), and the sedentary-to-extra-active span is 1,218 kcal against just 310 kcal of age effect across the whole adult range.
BMR at age 25 by body composition
| BMI | Men (175 cm) | Women (165 cm) | ||||
|---|---|---|---|---|---|---|
| Weight | Mifflin | Harris | Weight | Mifflin | Harris | |
| 20 | 61.3 kg | 1587 kcal | 1607 kcal | 54.5 kg | 1290 kcal | 1354 kcal |
| 25 | 76.6 kg | 1740 kcal | 1812 kcal | 68.1 kg | 1426 kcal | 1480 kcal |
| 30 | 91.9 kg | 1893 kcal | 2017 kcal | 81.7 kg | 1562 kcal | 1606 kcal |
| 35 | 107.2 kg | 2046 kcal | 2222 kcal | 95.3 kg | 1698 kcal | 1732 kcal |
From BMR to daily burn: TDEE at age 25
Multiplying BMR by an activity factor gives total daily energy expenditure. The factors below are the same five levels the main calculator offers, applied to the BMI-25 man from the table (76.6 kg, BMR 1740 kcal):
| Activity level | Factor | TDEE |
|---|---|---|
| Sedentary — little or no exercise | ×1.2 | 2088 kcal/day |
| Lightly active — 1–3 days/week | ×1.375 | 2393 kcal/day |
| Moderately active — 3–5 days/week | ×1.55 | 2697 kcal/day |
| Very active — 6–7 days/week | ×1.725 | 3002 kcal/day |
| Extra active — intense daily training | ×1.9 | 3306 kcal/day |
Get your own figure
Body size matters more than any reference table can capture, so a two-minute personal estimate is usually worth more than a row of averages. Enter your numbers and the box computes the Mifflin-St Jeor result with the same coefficients used across this site:
Frequently asked questions
What is the BMR of a 25-year-old?
It depends on body size as well as age. At age 25, a 175 cm man weighing about 76.6 kg has a Mifflin-St Jeor BMR of roughly 1740 kcal per day, while a 165 cm woman at 68.1 kg lands near 1426 kcal per day. The table above shows how the estimate moves across four common body-composition levels.
Why does BMR fall as age increases?
The Mifflin-St Jeor equation subtracts 5 kcal for every year of age, so between age 20 and age 80 the estimate drops by about 300 kcal per day at the same height and weight. The coefficient is a population average: body composition, not the birthday itself, drives most of the real change.
Mifflin-St Jeor or Harris-Benedict — which should I use?
Mifflin-St Jeor is the default on this site because validation studies found it tracks measured resting energy expenditure more closely for most adults. Harris-Benedict, shown beside it in the table, runs higher for many people — often by 5 to 10 percent — so comparing the two columns is a quick way to see the uncertainty band around any single number.
Nearby ages
Want the full picture — Katch-McArdle from body-fat percentage, the age chart and TDEE in one run? Open the BMRScope calculator or browse every age page.