How Many Calories Do I Burn Per Hour Doing Nothing? | Real-World Math

Calories Burned Per Hour While Resting: Real-World Math

Energy use at rest is often expressed with METs (metabolic equivalents). One MET equals sitting quietly. The standard conversion from METs to calories per hour is simple: kcal/hour = MET × 1.05 × body weight (kg). That 1.05 factor converts oxygen use to calories over an hour. With MET = 1.0, a 70 kg adult burns ~73.5 kcal each hour while sitting still.

Sleeping runs a touch lower at roughly 0.95 MET. Light fidgeting bumps it up. The Compendium’s inactivity entries list sleeping near 0.95 MET, sitting quietly around 1.0, and small movements such as hand or foot fidgeting at 1.3–1.8 MET. Those small changes matter across several hours.

Broad Hourly Estimates By Body Weight

Use the table to find a ballpark number for “doing nothing.” Column two assumes sitting quietly (1.0 MET). Column three estimates sleeping (0.95 MET). Numbers round to one decimal to keep things readable.

Body Weight (kg)	Sitting Quietly (kcal/h)	Sleeping (kcal/h)
45	47.3	44.9
50	52.5	49.9
55	57.8	54.9
60	63.0	59.9
65	68.3	64.8
70	73.5	69.8
75	78.8	74.8
80	84.0	79.8
85	89.3	84.8
90	94.5	89.8

These are quiet-room estimates. Real life wiggles the numbers. A cool room makes your body work to keep warm. A warm room can nudge the opposite way. Hormones, age, and body composition matter too. If you want a deeper primer on daily energy math, snacks and meals land better once you set your daily calorie needs.

What Drives “Doing Nothing” Calories?

Your body never idles. Even when you’re still, it runs core jobs: breathing, circulation, temperature control, repairs, and more. That baseline draw is often described with basal or resting metabolic rate. A plain-language explainer from a major medical center breaks down what basal metabolic rate includes and the factors that change it (age, sex, height, weight, and lean mass).

METs Turn Posture Into Math

To translate posture or stillness into calories, METs are the bridge. Sitting quietly is set to 1.0 by convention. Sleeping sits near 0.95. Light fidgeting raises it. The Compendium’s inactivity list pins these numbers activity by activity, which helps you estimate an hour on the couch vs. an hour in bed.

Resting Vs. True Basal

Basal metabolic rate (BMR) is measured under strict lab conditions after an overnight fast. Resting metabolic rate (RMR) is easier to capture and ends up slightly higher. Both describe the engine under the hood. For daily life, MET-based hourly math gives you a clean, usable estimate without a lab test.

How To Estimate Your Own Hourly Burn

Pick a state, grab the MET value, then multiply. Here’s the general pattern:

Hourly calories = MET × 1.05 × your weight (kg)

Two quick examples:

• 60 kg, sitting quietly: 1.0 × 1.05 × 60 = ~63 kcal/h
• 70 kg, sleeping: 0.95 × 1.05 × 70 = ~69.8 kcal/h

This same idea scales to gentle fidgeting or reading. If you want to see how resting burn fits inside a full day, the NIH’s research program outlines the classic three parts of total energy use: resting, the energy from digesting food, and movement. See the NIDDK page on energy expenditure components.

What Changes The Number Hour To Hour?

Room Conditions

Cool air raises heat production. Heavy blankets or a warm room can shave a few calories off. Comfort range narrows swings.

Fidgeting And Micro-Moves

Tapping feet, shifting in your seat, drumming fingers—tiny motions add measurable burn. The Compendium lists 1.3–1.8 MET for common fidgets, which can mean an extra 20–40 kcal in a single hour for larger bodies.

Size And Lean Mass

Heavier bodies burn more per hour at rest. More muscle tends to burn a bit more than equal weight in fat mass, which is why two people of the same weight can differ.

Sample Hourly Burn By State (70 kg Baseline)

Here’s a compact view that uses a single body weight to show the spread across common “still” states. METs reference the inactivity entries in the Compendium and convert to hourly calories with the same 1.05 × weight multiplier.

Posture/State	MET	kcal/h (70 kg)
Sleeping	0.95	69.8
Sitting Quietly	1.0	73.5
Sitting, Reading	1.3	95.6
Sitting, Fidgeting Hands	1.5	110.3

How This Ties Into Your Day

Hourly burn at rest is the floor. Meals add a small bump through diet-induced thermogenesis, often landing near ten percent of daily energy. Movement sits on top of both. If your goal is weight change, the baseline helps you budget food and activity without guesswork.

Practical Ways To Use The Number

• Track a long desk day: Multiply your quiet hours by the sitting estimate, then add your walking and chore time with their METs.
• Plan a rest day: Pair sleep and couch hours with the lower lines from the tables, then fit meals to match.
• Compare postures: Swapping an hour of phone scrolling in bed for an hour at the table reading adds ~25 kcal for a 70 kg adult. Small, but it stacks.

Method Notes And Constraints

These numbers are estimates, not lab measurements. Energy use changes with hormones, medications, illness, and body composition. The MET convention assumes a typical adult; individual resting rates can be higher or lower. For a plain-language refresher on the concept behind the baseline, revisit what BMR means. For activity intensity references, the Compendium’s inactivity list remains a helpful anchor for quiet states.

Where To Go Next

If you’d like a deeper dive into stillness vs. movement across a full day, this site’s article on calories burned while resting connects resting burn to total daily energy and gives step-by-step math you can reuse for planning.

Bottom Line For Quiet Hours

Your hourly number during inactivity follows a clean pattern: MET × 1.05 × body weight in kilograms. Sleeping lands a bit lower than sitting. Fidgeting lifts it. If a rough daily budget helps you eat and move with less guesswork, wrap this baseline into your plan and adjust with real-world feedback over a week or two. Want a friendly walkthrough? Try our daily calorie needs guide.