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Free fall calculator
Find out how long an object takes to fall from a height and how fast it hits the ground. This free-fall calculator works on Earth, the Moon, Mars and the other planets, and ignores air resistance. It runs in your browser.
How to calculate free fall time
- 1Enter the height in meters
- 2Choose Earth or another planet under gravity
- 3Read the fall time and impact speed
- Fall time in seconds and impact speed in m/s and km/h.
What you get
- Time and speed.The fall time in seconds, and the impact speed in m/s and in km/h.
- Nine gravities.Earth, Moon, Mars, Venus, Mercury, Jupiter, Saturn, Uranus and Neptune.
- Nothing is uploaded.The numbers are worked out in your browser and not sent anywhere.
What you can do
- Calculate the fall time with t = √(2h / g) for an object dropped from rest.
- Get the impact speed v = √(2gh), shown in m/s and km/h.
- Switch the gravity to see how a 10 m drop differs on the Moon, Mars or Jupiter.
- Starts at 10 m on Earth, so a result is shown right away.
Good to know
- Air resistance is ignored. Real objects, like a feather or a skydiver, fall slower than the result.
- The object starts at rest. For a throw, use the projectile motion calculator.
- Mass does not matter in free fall, so there is no mass field.
- Height cannot be negative, and an empty height gives no result.
Questions
How long does it take to fall 10 meters?
On Earth about 1.43 seconds, hitting the ground at about 14 m/s (50 km/h), without air resistance.
Does a heavier object fall faster?
Not without air. In free fall all masses reach the ground in the same time, which is why the tool does not ask for mass.
Can I calculate the fall on the Moon?
Yes. Pick Moon under gravity. The same drop takes about 2.5 times as long as on Earth.
Is air resistance included?
No. The result is the ideal case, and it is close for compact objects over short drops.