Calculate lifting energy, mass, or height with metric and US units, gravity, equipment efficiency, repetitions, average power, joules, watt-hours, and kWh.
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Energy to Lift an Object Formula
The following formula gives the ideal gravitational energy gained in one lift, with constant gravity and no change in speed. For N identical lifts and efficiency η, total input energy is E_input = m × g × h × N / η, where η is a fraction (100% = 1). Available input energy in the inverse modes is the total for all lifts, and mass and height are per lift. This energy estimate does not determine a safe lifting rating.
Variables:
- E is the useful gravitational energy gained in one lift, in joules (J)
- m is the mass of the object in kilograms (kg)
- g is the gravitational acceleration (approximately 9.8 m/s² on Earth)
- h is the height in meters (m)
To calculate the energy required to lift an object, multiply the mass of the object by the gravitational acceleration and the height to which the object is lifted.
| Mass (kg) | Energy (J) |
|---|---|
| 0.10 | 9.8 |
| 0.25 | 24.5 |
| 0.50 | 49 |
| 0.75 | 73.5 |
| 1 | 98 |
| 1.5 | 147 |
| 2 | 196 |
| 2.5 | 245 |
| 3 | 294 |
| 5 | 490 |
| 7.5 | 735 |
| 10 | 980 |
| 12 | 1176 |
| 15 | 1470 |
| 20 | 1960 |
| 25 | 2450 |
| 30 | 2940 |
| 40 | 3920 |
| 50 | 4900 |
| 100 | 9800 |
| Assumes lift height h = 10 m and gravitational acceleration g = 9.8 m/s². Formula: E = m × g × h. Therefore, 1 kg → 98 J. | |
What is Energy to Lift an Object?
The energy required to lift an object is the amount of work needed to move the object against the force of gravity to a certain height. This energy is often referred to as gravitational potential energy. It depends on the mass of the object, the height it is lifted, and the gravitational acceleration. The concept is widely used in physics and engineering to understand the energy transformations that occur when lifting objects.
How to Calculate Energy to Lift an Object?
The following steps outline how to calculate the energy required to lift an object.
- First, determine the mass of the object (m).
- Next, determine the gravitational acceleration (g), which is approximately 9.8 m/s² on Earth.
- Next, determine the height to which the object is lifted (h).
- Finally, calculate the energy using the formula E = m * g * h.
- After inserting the values and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Mass of the object (m) = 10 kg
Gravitational acceleration (g) = 9.8 m/s²
Height (h) = 5 m
