How fast do whales swim? Most whales swim at a steady 3 to 5 mph (about 5 to 8 km/h) when they cruise or migrate. In short bursts, however, blue whales pass 20 mph, fin whales reach about 23 mph, sei whales top 34 mph, and orcas can exceed 35 mph (56 km/h).
Convert How Fast Whales Swim to km/h and Knots
The converter opens at 5 mph, a typical cruising pace for a large whale. Next, type any speed from the chart below and pick its unit. The tool then shows the same speed in kilometers per hour, meters per second, feet per second and knots, so you can compare it with boat speeds or research papers.
Whales are the largest animals that have ever lived, so it is easy to picture them as slow. In fact, the opposite is often true. A blue whale can weigh up to 330,000 pounds, yet it still cruises at about the pace of a slow bicycle ride and sprints faster than most fishing boats troll.
The key is to separate two numbers. First, there is the everyday cruising speed that whales swim at for hours or days. Second, there is the short burst speed they use to lunge at prey or flee from danger. According to NOAA Fisheries, blue whales typically travel and feed at about 5 mph, but they can accelerate to more than 20 mph for short bursts.
Below, you will find a speed chart by species, an explanation of why giant and small whales cruise at nearly the same pace, and a simple way to estimate a whale’s speed yourself from a boat or the shore.
How Fast Whales Swim: Chart by Species
First, the table lists the speeds reported by wildlife agencies and tagging studies. In addition, all conversions use the exact definitions 1 mile = 1.609344 km and 1 knot = 1.852 km/h, and they are rounded to two decimals.
| Species | Typical cruise | Top burst (mph) | Top burst (km/h) | Source |
|---|---|---|---|---|
| Orca (killer whale) | not well measured | 35+ | 56+ | US Fish and Wildlife Service |
| Sei whale | not well measured | 34+ | 54.7+ | NOAA Fisheries |
| Fin whale | about 4 mph (tagged rorquals) | 23 | 37.01 | Alaska Dept. of Fish and Game |
| Blue whale | about 5 mph | 20+ | 32+ | NOAA Fisheries |
| Minke whale | about 4 mph | about 18.6 (tagged) | about 29.9 | Gough et al., 2019 |
| Gray whale | 3 to 5 mph | 10 to 11 | 16 to 17.7 | Alaska Dept. of Fish and Game |
| Humpback whale | about 4.5 mph on migration | faster in short lunges | – | NOAA Fisheries (computed) |
| Sperm whale | 3.2 to 3.7 mph while diving | not well measured | – | Miller et al., 2004 |
Printable tip: the chart fits on one page when you print from your browser, so it is easy to bring on a whale-watching trip or add to a school report.
Cruising Speed vs Burst Speed: Why the Numbers Disagree
One website says whales swim at 5 mph, while another says 30 mph. Both can be correct, because they describe different things. For that reason, this table separates the figures that often get mixed up.
| Figure | What it really means | Example |
|---|---|---|
| Cruising speed | The pace a whale holds for hours, chosen to save energy | About 1.9 m/s (4.25 mph) for tagged baleen whales |
| Migration average | Total distance divided by total time, including rests | Humpbacks: 3,000 miles in about 28 days, near 4.5 mph |
| Burst or sprint speed | A short dash to catch prey or escape, held for seconds or minutes | Blue whales: more than 20 mph |
| mph vs knots | The same speed in two units; 1 knot = 1.15 mph | 20 mph = 17.38 knots |
So, when you read a single “top speed” for a whale, treat it as a short burst. In everyday travel, however, almost every large whale moves far more slowly. For more on the boating unit, see how fast a knot is.
Why Giant and Small Whales Swim at the Same Cruising Speed
You might expect a 30-meter blue whale to cruise much faster than a 9-meter minke. Surprisingly, it does not. A 2019 study in the Journal of Experimental Biology tagged baleen whales from Antarctic minkes up to blue whales. On average, they cruised at about 1.9 m/s, or roughly 4.25 mph (6.84 km/h), and body size made no real difference.
Instead, the big whales changed how they swam. Larger whales beat their tails more slowly, because each sweep of a huge fluke pushes much more water. As a result, a blue whale and a minke end up at a similar speed with very different tail rhythms.
Of course, there is a good reason for this. Drag in water rises steeply with speed, so a faster cruise burns far more energy. Therefore, whales swim at a pace that covers a lot of ocean for the least effort. Notably, the same study points out that most swimming animals cruise somewhere between 1 and 2 m/s, whatever their size.
How Far Whales Swim in a Day and on Migration
Even so, slow and steady adds up quickly. At a 1.9 m/s cruise held around the clock, a whale would cover about 164 km (102 miles) in a day. Real whales stop to feed, rest and socialize, of course, so daily distances vary a lot.
Migrations show what that steady pace can do. For example, NOAA notes that some humpbacks travel the 3,000 miles from Alaska to Hawaii in as few as 28 days. That works out to an average of about 4.5 mph (7.2 km/h), day and night. Similarly, Australian wildlife officials give an average migration speed of about 7 km/h for humpbacks.
Gray whales, in addition, go even farther. NOAA reports a round trip of about 10,000 miles, and sometimes more than 14,000 miles. Meanwhile, the Alaska Department of Fish and Game says gray whales average 3 to 5 mph during migration and can reach 10 to 11 mph when in danger.
Whales vs People and Other Swimmers
How do whales stack up against other swimmers? In short, they beat any person over distance by a wide margin, although a top sprint swimmer can briefly outpace a cruising whale.
| Swimmer | Speed | In km/h | Notes |
|---|---|---|---|
| Orca burst | 35+ mph | 56+ | The fastest animal usually called a whale |
| Blue whale burst | 20+ mph | 32+ | Short lunges only |
| Tagged baleen whale cruise | about 4.25 mph | about 6.84 | Hours at a time |
| Elite human sprint swimmer | about 5.3 mph | about 8.6 | 50 m freestyle in about 21 seconds |
| Sperm whale on a deep dive | about 3.2 to 3.7 mph | about 5.2 to 5.9 | Descent and ascent averages |
Interestingly, a world-class sprinter is briefly faster than a cruising whale. However, the swimmer holds that pace for about 21 seconds, while the whale holds its pace for days. For land speeds, our guide to how fast a human can run uses the same unit conversions, and how fast dolphins swim covers the smaller relatives of whales.
Recommended Binoculars for Whale Watching
Since you should watch whales from a distance, good binoculars make the trip. On a moving boat, a 7×50 marine model is the classic choice, because lower magnification keeps the image steadier and the large lenses stay bright on gray days. From shore or a cliff, however, an 8×42 or 10×42 pair is lighter and still shows a spout or a fluke clearly. Also look for waterproof, fog-proof housings, because salt spray is hard on optics.
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How to Estimate How Fast Whales Swim From a Boat or Shore
Researchers use tags and GPS, but you can get a fair estimate with a watch and a known distance. So here is a simple method.
- Pick two landmarks. Choose two fixed points the whale will pass, such as a buoy and a headland, or two marks on a chart.
- Find the distance between them. Read it from a nautical chart, a map app or a GPS plotter.
- Time the whale. Start a stopwatch when the spout or back passes the first point and stop it at the second.
- Divide distance by time. For example, 500 meters in 4 minutes (240 seconds) is about 2.1 m/s.
- Convert the result. Enter the speed in the converter above; 2.1 m/s is about 4.7 mph or 4.1 knots.
- Repeat and average. Whales dive and change course, so several timings give a fairer number than one.
Whale Watching Do and Don’t
Do
- Stay at least 100 yards away, as NOAA’s viewing guidelines advise.
- Slow your boat to no-wake speed near whales.
- Watch for spouts to judge where a whale will surface.
- Use binoculars rather than moving closer.
- Check local rules, since some areas require more distance.
Don’t
- Chase a whale or cut across its path.
- Place your boat between a mother and her calf.
- Assume a slow whale cannot surface suddenly nearby.
- Feed or touch whales.
- Fly drones low over them where rules forbid it.
Honest Limits of Whale Speed Figures
Above all, whale speeds are field estimates, not stopwatch records on a fixed course. Tags measure cruising well, but rare top sprints are hard to catch, so many burst figures come from older ship-based observations. As a result, sources disagree: some give sei whales about 31 mph, while NOAA now says over 34 mph. Likewise, speed changes with age, health, group size and whether the whale is feeding. The unit conversions on this page are exact, but the input speeds carry that natural uncertainty. In short, use the numbers to understand scale, not as precise limits for every animal.
When Accuracy Really Matters
For a school project, “most whales cruise at about 5 mph” is plenty. However, accuracy matters more in two cases. First, boaters need to know that a whale can surface or change direction faster than its lazy pace suggests. Second, anyone citing whale speeds in a report should say whether a figure is a cruise, a migration average or a burst, and name the source.
How Fast Whales Swim: FAQs
How fast do whales swim on average?
Tagged baleen whales cruise at about 1.9 m/s, which is roughly 4.25 mph or 6.84 km/h. Most large whales travel at 3 to 5 mph.
What is the fastest whale?
The orca, which is technically a dolphin, can exceed 35 mph. Among the great whales, NOAA says sei whales can top 34 mph, and fin whales reach about 23 mph.
How fast can a blue whale swim?
A blue whale usually travels at about 5 mph, but it can burst to more than 20 mph (32 km/h) for short periods, according to NOAA Fisheries.
Do whales swim faster than humans?
Yes, over any real distance. An elite human sprint swimmer reaches about 5.3 mph for 50 meters, while whales cruise near that pace for days and burst to 20 mph or more.
How fast can an orca swim?
Orcas often reach speeds of more than 35 mph (56 km/h) in short bursts, according to the US Fish and Wildlife Service.
Why do big whales cruise at the same speed as small ones?
Large whales beat their tails more slowly, and each stroke moves more water. As a result, blue whales and minke whales cruise at about the same speed.
How far do whales swim in a day?
At a steady 1.9 m/s, a whale would cover about 164 km (102 miles) in 24 hours. Real daily distances are shorter when whales stop to feed or rest.
How fast do whales swim when they migrate?
Humpbacks average about 4.5 mph on the Alaska to Hawaii route, and gray whales average 3 to 5 mph on their migration.
What is 20 mph in km/h and knots?
20 mph is about 32.19 km/h, 8.94 meters per second, or 17.38 knots.
Can a whale outswim a boat?
Most powerboats are faster than a whale, but a whale can surface or turn suddenly. That is why NOAA advises staying at least 100 yards away and slowing down near whales.
The Bottom Line
To sum up, most whales cruise at about 3 to 5 mph, and tagged baleen whales average close to 4.25 mph regardless of size. In short bursts, blue whales pass 20 mph, fin whales reach about 23 mph, sei whales top 34 mph, and orcas exceed 35 mph.
So when you compare figures, first check whether each one is a cruise, a migration average or a sprint. Then use the converter at the top of the page to turn any whale speed into km/h, meters per second or knots.
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