Running burns more calories per kilometer than walking — but the gap is smaller than most people expect, and the trade-offs in injury risk and joint health tell a very different story. Here is what the peer-reviewed evidence actually says.
The Calorie Question
The net caloric cost of running is approximately 1.0 kcal per kilogram per kilometer. Walking comes in at around 0.5 kcal/kg/km. For a 70 kg person, that translates to roughly 70 kcal per kilometer of running versus 40–50 kcal per kilometer of walking. Running burns approximately 30% more gross calories per km.
Hall C et al. Energy expenditure of walking and running. Medicine & Science in Sports & Exercise, 2004. PMID 15570150
The practical implication: if your goal is calorie burn and you have limited time, running is more efficient. If you have more time or prefer slower movement, walking gets you there — it just takes longer. If you are building a sustainable daily walking habit, the consistency matters more than the per-km efficiency.
What About Your Joints?
Walking generates ground reaction forces of 1.0–1.5 times body weight. Running pushes that to 2–3 times body weight with every stride.
Nilsson J, Thorstensson A. Ground reaction forces at different speeds of human walking and running. Acta Physiologica Scandinavica, 1989. PMID 2782094
But here is the counterintuitive finding: recreational runners actually show lower rates of knee osteoarthritis than sedentary individuals. A large meta-analysis found knee OA prevalence of 3.5% in recreational runners, compared to 10.2% in sedentary people. Competitive runners showed 13.3% — suggesting a U-shaped relationship where moderate running protects cartilage while extreme volume damages it.
Alentorn-Geli E et al. The Association of Recreational and Competitive Running With Hip and Knee Osteoarthritis. JOSPT, 2017. PMID 28504066
Walking remains the lower-impact option — a meaningful advantage for people recovering from injury, managing existing joint conditions, or returning to movement after a long break.
Heart Health
When researchers controlled for energy expenditure — comparing people who burned the same total calories whether through walking or running — the reduction in cardiovascular risk was statistically equivalent. Walking and running produced comparable reductions in risk for hypertension, high cholesterol, diabetes, and coronary heart disease.
Williams PT, Thompson PD. Walking Versus Running for Hypertension, Cholesterol, and Diabetes Mellitus Risk Reduction. ATVB, 2013. PMID 23559628
Your heart does not care how fast the calories were burned. To match a 30-minute run, you need a longer walk. If you are curious about the right step target, the evidence on the 10,000 steps myth offers useful context.
Injury Risk
This is where the two activities diverge most sharply. Running carries an injury rate of 37–56% per year among recreational participants. Walking sits between 1–5% per year. That is roughly a ten-fold difference.
Colbert LH, Hootman JM, Macera CA. Physical activity-related injuries in walkers and runners in the Aerobics Center Longitudinal Study. CJSM, 2000. PMID 11086751
Every time an injury sidelines you, it breaks the consistency that makes exercise effective. A 1–5% injury risk that keeps you moving reliably often beats a 40% risk that interrupts your routine several times a year.
Mental Health
A 2023 trial found that both running therapy and SSRI antidepressants produced approximately 44% remission rates in patients with depression and anxiety (43.3% running, 44.8% SSRIs). A 2024 systematic review confirmed walking produces comparable mental health outcomes.
Verhoeven JE et al. Antidepressant medication versus running therapy. J Affect Disord, 2023. PMID 36828150
Both work equally well. The mechanism appears tied to consistency and energy expenditure rather than intensity. More on this in our article on walking and stress.
The Bottom Line
Walking and running can achieve the same cardiovascular and mental health outcomes when energy expenditure is matched. What separates them is the practical cost. Running is time-efficient but carries 10x higher injury risk. Walking is slower but keeps you moving consistently — which is what produces lasting health outcomes.
MistyWay is built around walking because the science supports it: the safer activity is also the one most people can do every single day. Turning those daily steps into quests, achievements, and a fantasy journey makes the sustainable choice also the engaging one. Free on iOS and Android.