The math behind it
Casual walking costs about 3.0 MET — three times your resting burn — and most people take roughly 100 steps per minute at that pace. So the calculation runs in two moves: your steps become minutes of walking (steps ÷ 100), and those minutes become calories through the standard MET formula, kcal per minute = MET × 3.5 × weight (kg) ÷ 200.
For a 70 kg person that works out to about 3.7 kcal per 100 steps, so 10,000 steps burn roughly 368 kcal. At 100 kg the same steps burn about 525 kcal. Hills, speed, and stride length shift the result a little; body weight moves it a lot. The estimate here assumes flat ground at an easy pace, so treat it as the floor of what your steps are worth.
Where the 10,000-step target came from
Not from a lab. In 1965 the Japanese company Yamasa launched a pedometer called manpo-kei, literally "10,000-step meter", riding the fitness wave around the Tokyo Olympics. The number was chosen because it sounded good and the kanji for 10,000 resembles a walking person. It stuck for sixty years because it is round and ambitious, not because anything magic happens at step 10,000.
The research arrived decades later and tells a gentler story. A 2019 JAMA Internal Medicine study of older women found mortality benefits rising up to about 7,500 steps a day, then leveling off. A 2022 meta-analysis in The Lancet Public Health, covering 47,000 adults, put the plateau at about 6,000–8,000 steps for people over 60 and 8,000–10,000 for younger adults. The steepest gains come at the bottom: moving from 3,000 to 6,000 steps buys more health than moving from 8,000 to 11,000.
Steps are NEAT, and NEAT is a big lever
Most steps are not exercise. They are NEAT — non-exercise activity thermogenesis, the energy cost of everything that is neither training nor rest. NEAT is the most variable part of daily burn: between two people of the same size it can differ by several hundred calories a day, and it quietly drops when you diet, which is one reason weight loss stalls.
That makes steps the easiest burn to defend. An extra 3,000 steps — parking farther away, taking calls on foot — adds roughly 110 kcal a day at 70 kg, about 770 a week, without a gym visit. Walking also spikes appetite less than hard cardio does, so the calories tend to stay spent. For dedicated workouts, the calories burned calculator covers 15 activities, and your TDEE puts steps and everything else into one daily number.
