How Many Calories Burned Without Moving? | Rest Math

Your body spends energy every minute, even when you stay still. Breathing, heart rhythm, brain work, body temperature control, and basic cellular tasks all draw fuel. This quiet burn is often called resting metabolic rate (RMR) or basal metabolic rate (BMR). The range above gives you a workable target for couch time, office time, or bedtime.

Calories Burned At Rest Per Hour: Simple Rule

A handy way to estimate hourly burn without activity is the MET convention. One MET equals the energy cost of sitting quietly and is set at ~1 kcal per kilogram per hour in the physical-activity compendium used by researchers. In short: multiply your body weight in kilograms by ~1 to get an hourly estimate. A 60 kg person uses ~60 kcal per hour while resting; a 90 kg person spends ~90 kcal per hour. This rule comes from standardized references that map activity intensity to energy cost.

Broad Weight-Based Estimates (Early Benchmarks)

The table below turns that rule into fast numbers you can apply during quiet rest. It also projects a full day of resting energy if you stayed still for 24 hours (helpful for ballpark math).

Body Weight*	Calories Per Hour (Rest)	Calories Per 24 Hours (Rest)
50 kg (110 lb)	~50	~1,200
60 kg (132 lb)	~60	~1,440
70 kg (154 lb)	~70	~1,680
80 kg (176 lb)	~80	~1,920
90 kg (198 lb)	~90	~2,160
100 kg (220 lb)	~100	~2,400

*These figures use the 1 kcal/kg/hour convention. Real resting burn varies by age, height, sex, and lean mass.

Once you have a baseline, planning meals and snacks gets easier once you set your daily calorie needs. That number anchors weight change math and helps you compare your quiet hours to your active hours later in the day.

What Drives Resting Energy Use

Every person has a built-in energy floor. BMR describes the calories needed to keep vital systems running at total rest. MedlinePlus defines this as energy for core functions such as breathing, heart rate, and digestion. Age, height, sex, and especially lean tissue shift that floor up or down.

Lean Mass And Body Size

Muscle tissue costs more energy to maintain than fat tissue. People with more lean mass usually have a higher resting burn than people of the same weight with less lean mass. That’s why strength work raises daily energy use even on off days.

Age And Sex

RMR tends to decline with age and is different between males and females due to body composition and hormonal factors. Equation-based estimates reflect these differences and beat simple weight-only math for most people.

Food Processing Cost (TEF)

Digesting food uses energy too. The thermic effect of food (TEF) accounts for a noticeable slice of daily burn, often near ~10% across a mixed diet. Protein tends to produce a higher TEF than fat. TEF is smaller in older adults.

Fidgeting And Micro-Moves (NEAT)

Even when “not moving,” tiny posture shifts and fidgeting sneak in. Researchers call this non-exercise activity thermogenesis (NEAT), and it explains why two people with the same stats can differ by hundreds of calories per day.

From Rule Of Thumb To A Personal Number

The weight-only rule gives fast, usable math. If you want a closer estimate for quiet rest, the Mifflin–St Jeor equation is the standard in clinics and nutrition practice. It predicts resting energy from weight, height, age, and sex. Independent comparisons show this formula tracks measured values better than older options for most adults.

How The Equation Works

Men: 10×weight(kg) + 6.25×height(cm) − 5×age + 5

Women: 10×weight(kg) + 6.25×height(cm) − 5×age − 161

These outputs represent resting calories per day. Divide by 24 to get an hourly figure. The equation was derived from indirect calorimetry data and remains widely used in clinics and research.

Quick Examples Using Realistic Stats

Below are three sample profiles to show how age, height, sex, and weight shift resting burn, even with no activity layered on top.

Profile	Estimated RMR (kcal/day)	Per Hour (kcal/h)
Female, 30 y, 60 kg, 165 cm	~1,320	~55
Male, 35 y, 75 kg, 178 cm	~1,693	~71
Female, 45 y, 90 kg, 170 cm	~1,577	~66

Values use the Mifflin–St Jeor equation. Outputs are estimates, not medical diagnostics.

Hourly Burn During Bed Rest Vs. Typical Day

Quiet bed rest sits near the low end of resting energy. A typical desk day adds small NEAT bumps from posture changes, bathroom trips, and light chores. Those tiny increments nudge hourly totals above pure bed-rest figures. The compendium that defines MET values sets 1 MET for quiet sitting; light standing or slow ambulation slides above 1 MET.

When A Calculator Helps

If you want a tailored number for weight maintenance planning, a calorie calculator based on Mifflin–St Jeor gives a dependable starting point. Public health tools that estimate intake needs also bake in age, sex, height, weight, and activity level to frame a daily plan.

How To Estimate Your Own Resting Burn

1) Do The One-Step Version

Convert your weight to kilograms (pounds ÷ 2.205). Multiply by ~1 for calories per hour at rest. Multiply by 24 for a full day at quiet rest.

2) Refine With Mifflin–St Jeor

Plug weight, height, age, and sex into the equation above. That gives daily resting burn. Divide by 24 to compare with your hourly target. This approach accounts for more of what makes you you and aligns better with lab measurements.

3) Add Food Processing And Micro-Moves

After meals, TEF lifts energy use for a few hours. Across a mixed diet, plan on roughly a tenth of intake returning as heat. On a day with gentle fidgeting, a few extra standing periods, or light chores, NEAT bumps the total a bit more. That’s why real-world “not moving” often lands slightly above strict bed rest.

Answers To Common “Still-Time” Questions

Does Sleep Burn Fewer Calories Than Sitting?

Sleep is near the lower edge of resting energy for many people, but the gap compared with quiet sitting isn’t huge. Overnight, body temperature dips and muscle tone falls, trimming energy use a touch. Expected range still tracks close to the 1 kcal/kg/hour rule.

Why Do Two Similar People Have Different Resting Numbers?

Lean mass differences, small hormone variations, recent food intake, and genetics all matter. NEAT habits vary a lot too. These add up to noticeable day-to-day spreads even with the same weight and height.

Can Food Choices Change Resting Burn?

Mixed diets show a TEF around one-tenth of intake. Protein tends to push TEF higher than fat. The effect is real but shouldn’t be treated like a magic lever; it’s a modest nudge inside total energy balance.

Trusted Definitions You Can Rely On

Health agencies keep consistent definitions for these terms. One MET is set at ~1 kcal/kg/hour and ~3.5 ml/kg/min oxygen use. BMR describes energy for basic life functions at rest. You’ll see those same anchors across research compendia and patient resources, which keeps your math comparable across tools. For a plain-language refresher on BMR, see the MedlinePlus definition. For the MET standard used in activity tables, refer to the Compendium site.

Putting It To Use Without Guesswork

Step-By-Step Plan

Step 1: Pick Your Baseline

Start with the hourly estimate from body weight or the equation-based daily value. Write it down.

Step 2: Sketch A Typical Day

Count hours you’re asleep, seated, standing, or moving lightly. For desk blocks, use the resting rate; for standing blocks, slide slightly above 1 MET.

Step 3: Align Intake With Targets

Match your intake to maintain, or trim intake for a steady deficit if weight loss is your goal. Want a deeper walkthrough? Try our calorie deficit guide.

Key Takeaway You Can Use Today

Multiply body weight in kilograms by ~1 for an hourly rest estimate, then layer in age, height, and sex with the Mifflin–St Jeor equation when you want tighter numbers. Keep TEF and tiny daily movements in mind, since both nudge totals above strict bed rest for most people. With those pieces, you can plan meals and breaks with real confidence, even on low-activity days.