How Fast Can a Chimpanzee Actually Run?

Chimpanzees can run at roughly 25 miles per hour in short bursts, though that commonly repeated figure comes from limited field observations rather than controlled measurement. That puts them well behind elite human sprinters and far behind specialized quadrupedal runners, which may surprise people who think of chimps as overwhelmingly athletic. The real story is that chimpanzee bodies are optimized for a very different set of physical tasks, and understanding why they top out where they do reveals a lot about how evolution shaped both their movement and ours.

Where the 25 mph Figure Comes From

If you search for chimpanzee running speed, you’ll find the same number repeated everywhere: about 25 mph, or roughly 40 km/h. The problem is that this figure is not backed by the kind of rigorous biomechanical testing that has been done for human sprinters or racehorses. Most estimates trace back to a handful of field observations of wild chimps sprinting during hunts or territorial encounters, supplemented by occasional captive observations. No one has strapped a radar gun to a chimp on a measured track under controlled conditions, for obvious ethical and practical reasons.

What we can say with more confidence is where chimp speed sits relative to humans. Usain Bolt’s peak sprint speed was recorded at about 27.8 mph. An average fit human can sprint somewhere around 15 mph. So a chimp at full tilt is faster than most people but not dramatically faster than the fastest humans. Given that chimps weigh only about 40 to 60 kilograms and have relatively short legs, even reaching 25 mph is a respectable output. But they can only sustain it for a few seconds at a time, and the anatomical reasons for that limitation are well understood.

Muscle Built for Power, Not Sustained Speed

Chimpanzee muscle is composed of about 67% fast-twitch fibers, a much higher fraction than in humans.¹ Fast-twitch fibers generate explosive force quickly, which is exactly what you need for climbing trees, swinging through branches, and wrestling with rivals. Computer simulations from that same research show that a chimpanzee muscle produces about 1.35 times more dynamic force and power than a human muscle of the same size. That sounds like it should make chimps faster, but the relationship between raw muscular power and running speed is not that simple.

Fast-twitch fibers fatigue rapidly. They burn through energy stores and accumulate metabolic waste much faster than slow-twitch fibers do. For a brief explosive movement, whether it’s a leap, a charge, or a powerful arm swing, fast-twitch dominance is ideal. For sustained running, it’s a liability. Humans, by contrast, have evolved a strikingly different muscle profile. In the major calf muscles, humans carry two to three times the proportion of fatigue-resistant, slow-twitch fibers compared to chimps.² Those fibers are packed with mitochondria and designed to keep producing force over long periods. That’s the physiological basis for human endurance running, and it’s a trade-off chimps never made.

The Strength-Speed Trade-Off

Chimpanzees are famously strong, roughly four times as strong as fit young humans when you adjust for body size.³ That strength comes at a direct cost to speed. The same research that documented this difference proposed that chimps have far fewer small motor units than humans. Motor units are the bundles of muscle fibers controlled by a single nerve signal. Humans have many small ones, which allows for fine gradations of force: you can thread a needle, throw a fastball with precise control, or modulate your stride to run efficiently at varying speeds. Chimps have fewer, larger motor units, which means they recruit more muscle fibers earlier in any given task. That’s great for raw power but terrible for the kind of finely tuned, economical movement that distance running demands.

Think of it like the difference between a diesel truck engine and a sports car engine. The chimp’s muscular system is built for torque: hauling a heavy body up vertical tree trunks, ripping apart tough food sources, grappling with competitors. The human system sacrificed that brute force for speed and precision. The speed humans gained at the expense of power is what makes running, throwing, and even fine tool manipulation possible.

Hip and Pelvis Geometry Enforce a Crouched Gait

Even if you transplanted human muscles into a chimpanzee skeleton, the chimp still wouldn’t run like a human. The ape pelvis is shaped to generate powerful hip extension moments, which is critical for climbing, but it limits the range of hip extension during walking and running.⁴ The result is a crouched, bent-knee gait that any zoo visitor has seen. Chimps can walk and run on two legs, but their bipedal movement looks labored and awkward for a reason: their skeleton literally prevents them from straightening their hips and knees the way you do with every stride.

A crouched gait is mechanically expensive. Holding bent joints means the muscles have to work constantly to support body weight, rather than being able to lock out the leg and let the bones carry the load the way humans do during the mid-stance phase of walking. This is one reason why chimps default to quadrupedal knuckle-walking when they need to cover any real distance on the ground. On all fours, they distribute the work across four limbs and reduce the strain on any single joint. Their quadrupedal gait is not particularly fast either, but it’s more sustainable than their bipedal alternative.

The Achilles Tendon Problem

One of the most underappreciated factors in running speed is elastic energy storage. When you run, your Achilles tendon stretches as your foot hits the ground and then snaps back like a rubber band, returning a significant portion of that energy to your next stride. This spring-like mechanism makes running far cheaper in terms of energy. Humans have long, well-developed Achilles tendons connecting short-fibered calf muscles to the heel bone, and this arrangement is central to our running ability.

Chimpanzees and other non-human apes lack this architecture. Their calf muscles have longer fibers and shorter, less elastic tendons, which means they lose most of that free energy return with every footfall. Biomechanical simulations modeling these differences found that maximum speed with non-human ape calf architecture was only 54% of what could be achieved with human-like calf architecture, while the energy cost of transport was 42% higher.⁵ That simulation was actually modeling an early hominin, Australopithecus afarensis, but the ape-like calf configuration it tested mirrors what chimps have. The takeaway is clear: without an effective tendon spring, every stride costs dramatically more energy and generates less speed.

The Energy Cost of Getting Around

When researchers actually measured the metabolic cost of chimpanzee locomotion, the numbers were striking. Human walking is roughly 75% less costly than both quadrupedal and bipedal walking in chimpanzees.⁶ That means chimps burn about four times as much energy as a human covering the same distance on foot. Interestingly, the same study found that for chimps themselves, walking on two legs versus four doesn’t differ much in cost when you average across individuals, though individual chimps do show significant differences depending on which mode they use.

This enormous energy gap helps explain why chimps don’t run unless they have to. A chimp that sprints after prey or charges at a rival is making a serious metabolic investment. The short burst is tolerable, but anything resembling sustained pursuit would drain energy reserves rapidly. Wild chimps solve this problem by relying on ambush, cooperation, and cornering during hunts rather than chasing prey over long distances. Their predatory strategy is built around their actual capabilities rather than against them.

Why Humans Are the Better Runners

It may seem counterintuitive that a species as physically formidable as the chimpanzee is a worse runner than the relatively frail-looking human, but the evidence is overwhelming. Humans carry substantially more hind-limb muscle relative to body mass: about 250 grams per kilogram of body weight, compared to about 170 grams per kilogram in chimps.² In fact, humans carry about the same amount of muscle in their legs alone as chimps carry in all four limbs combined. Add in the slow-twitch fiber dominance, the elastic Achilles tendon, the fully extended hip, and the efficient stride mechanics, and humans are simply built for a different locomotor world.

The evolutionary logic is that our ancestors shifted from a climbing-focused lifestyle to one that demanded covering large distances on the ground, probably to access widely scattered food sources on the African savanna. Endurance running allowed early humans to employ persistence hunting and scavenging strategies that didn’t require top-end speed but did require the ability to keep moving in heat for hours. Chimps never faced that selective pressure. They remained in forested habitats where climbing ability, upper-body strength, and short bursts of ground speed served them perfectly well.

Quadrupedal Versus Bipedal Sprinting in Chimps

When chimps need to move fast, they almost always do it on all fours. Knuckle-walking transitions into a gallop-like quadrupedal run that is more stable and generates more speed than their bipedal alternative. Great apes in general show broad similarity in their quadrupedal walking patterns, with walking speed being the strongest predictor of gait variables rather than body size.⁷ One interesting quirk is that great apes don’t favor the diagonal-sequence footfall pattern that most primates use. Instead, they shift between diagonal and lateral sequences, which may reflect the demands of moving their relatively heavy bodies over uneven forest-floor terrain.

Bipedal sprinting in chimps does happen, but it’s usually a display behavior: charging at a rival while swinging branches, slapping the ground, or making themselves look as large and threatening as possible. In those moments, looking intimidating matters more than covering ground efficiently. The bipedal run looks dramatic but is biomechanically wasteful and cannot be sustained for more than a handful of seconds.

How Bonobos Compare

Bonobos are the chimpanzee’s closest relative, and casual observers often lump them together. But fieldwork comparing the two species has found real differences in how they move. Bonobos are more arboreal than chimpanzees, and male bonobos are more suspensory, spending more time hanging and swinging beneath branches.⁸ This finding contradicts the older idea that bonobos are simply scaled-down versions of chimps with no significant locomotor differences. Bonobos have a longer and more narrow shoulder blade, which favors suspensory movement, and they spend more of their time high in the canopy.

No direct speed comparison between bonobos and chimpanzees exists in controlled conditions. Given that bonobos are somewhat lighter-bodied and more arboreal, they may be slightly less capable as ground sprinters, but this is speculative. Both species face the same fundamental biomechanical constraints: the crouched gait, the high energy cost of bipedal movement, the lack of elastic energy return, and the fast-twitch muscle dominance that favors power over endurance. The differences between them are more about habitat use and behavioral ecology than about raw locomotor performance on the ground.

What Chimps Actually Use Speed For

In the wild, chimpanzees rarely sprint in open terrain the way a cheetah or even a dog would. Their bursts of speed happen in dense forest environments during a few specific contexts. Territorial patrols sometimes escalate into violent encounters where males charge toward intruders. Cooperative hunts targeting smaller primates like colobus monkeys involve short sprints through the canopy and along branches, with some ground pursuit. And social displays, where a male charges through a group to assert dominance, involve dramatic but brief runs.

In all these situations, the sprint lasts only seconds. The chimp’s muscular system is perfectly suited to this pattern: generate enormous force very quickly, then stop. A five-second burst at 25 mph covers about 55 meters, which is more than enough for a charge display or to close distance on prey in a forest setting. The question “how fast can a chimp run?” is almost beside the point in ecological terms, because chimps almost never need to sustain anything close to their top speed. Their world is three-dimensional, full of vertical escapes and tight spaces between trees, and their bodies reflect that reality. Speed on flat open ground is a human obsession, one that evolution built our lineage for and theirs against.

Could a Chimpanzee Outrun You?

Over a short distance, almost certainly yes. If a chimpanzee charged at you from 30 meters away, your reaction time plus acceleration phase would not save you. An average person tops out around 15 mph in a sprint, and most people can’t even reach that. The chimp’s explosive fast-twitch muscle system would have it at top speed before you finished your first few strides. Over anything longer than a couple of hundred meters, the tables turn. Your slow-twitch fibers, efficient stride, elastic tendons, and superior cooling system (humans are among the best sweaters in the animal kingdom, which prevents overheating) would leave the chimp behind. The chimp would overheat, exhaust its fast-twitch fibers, and slow to a walk long before you did.

This isn’t a hypothetical you should ever test, of course. Chimps are extraordinarily dangerous animals whose strength, speed, and aggression make any close encounter risky. But the comparison illustrates the fundamental evolutionary trade-off at work. Chimps are built for a world of climbing, grappling, and short explosive actions. Humans are built for a world of walking, running, throwing, and fine manipulation over sustained periods. Neither body plan is better in absolute terms. Each is exquisitely tuned to the ecological niche that shaped it, and the speed question is just one window into that divergence.