Enter the capacity in ampere-hours (Ah) and the voltage in volts (V) into the calculator to determine the energy in joules (J).
Ah to Joules Formula
The following formula is used to convert ampere-hours to joules.
E (J) = C (Ah) * V (V) * 3600
Variables:
- E is the energy in joules (J)
- C is the capacity in ampere-hours (Ah)
- V is the voltage in volts (V)
To convert ampere-hours to joules, multiply the capacity in Ah by the voltage in V and then by 3600 (the number of coulombs in one ampere-hour).
| Capacity (Ah) | Joules at 1.5 V | Joules at 3.7 V | Joules at 5 V | Joules at 12 V |
|---|---|---|---|---|
| 0.1 | 540 | 1332 | 1800 | 4320 |
| 0.2 | 1080 | 2664 | 3600 | 8640 |
| 0.5 | 2700 | 6660 | 9000 | 21600 |
| 0.8 | 4320 | 10656 | 14400 | 34560 |
| 1 | 5400 | 13320 | 18000 | 43200 |
| 1.2 | 6480 | 15984 | 21600 | 51840 |
| 1.5 | 8100 | 19980 | 27000 | 64800 |
| 2 | 10800 | 26640 | 36000 | 86400 |
| 2.5 | 13500 | 33300 | 45000 | 108000 |
| 3 | 16200 | 39960 | 54000 | 129600 |
| 4 | 21600 | 53280 | 72000 | 172800 |
| 5 | 27000 | 66600 | 90000 | 216000 |
| 7 | 37800 | 93240 | 126000 | 302400 |
| 10 | 54000 | 133200 | 180000 | 432000 |
| 12 | 64800 | 159840 | 216000 | 518400 |
| 20 | 108000 | 266400 | 360000 | 864000 |
| 35 | 189000 | 466200 | 630000 | 1512000 |
| 50 | 270000 | 666000 | 900000 | 2160000 |
| 75 | 405000 | 999000 | 1350000 | 3240000 |
| 100 | 540000 | 1332000 | 1800000 | 4320000 |
| * Rounded to whole joules. Formula: E (J) = Ah × 3600 × V. Common voltages shown: 1.5 V, 3.7 V, 5 V, 12 V. | ||||
What is Energy in Joules?
Energy in joules is a unit of work or energy in the International System of Units (SI). It is defined as the amount of work done when a force of one newton displaces an object by one meter in the direction of the force. In the context of electrical energy, one joule is the energy transferred when one ampere of current passes through an electrical potential difference of one volt for one second.
How to Calculate Energy in Joules from Ah and Voltage?
The following steps outline how to calculate the energy in joules from ampere-hours and voltage.
- First, determine the capacity of the battery or electrical component in ampere-hours (Ah).
- Next, determine the voltage (V) of the battery or electrical system.
- Use the formula E (J) = C (Ah) * V (V) * 3600 to calculate the energy in joules.
- Finally, enter the values into the calculator above to verify the result.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Capacity (C) = 5 Ah
Voltage (V) = 12 V
