1 mAh Is How Many Wh?

Quick Answer: 1 mAh = 0.0037 Wh (at 3.7V)

mAh → Wh Wh → mAh
Milliamp-hours
=
Watt-hours
Auto-fills voltage
Nominal battery voltage
Conversion Result
1 mAh = 0.0037 Wh (at 3.7V)

At 3.7V nominal voltage

1 mAh = 0.0037 Wh (at 3.7V)

Step-by-step:

  1. Formula: Wh = mAh × V / 1,000
  2. 1 × 3.7 / 1,000 = 0.0037 Wh

Similar mAh to Wh Conversions

Values close to 1 mAh (at 3.7V Li-ion):

mAh Wh (at 3.7V)
1 mAh 0.0037 Wh
11 mAh 0.0407 Wh
21 mAh 0.0777 Wh
31 mAh 0.1147 Wh
41 mAh 0.1517 Wh
51 mAh 0.1887 Wh

Popular mAh to Wh Conversions

3,000 mAh11.1 Wh 3,500 mAh12.95 Wh 4,000 mAh14.8 Wh 5,000 mAh18.5 Wh 6,000 mAh22.2 Wh 10,000 mAh37 Wh 15,000 mAh55.5 Wh 20,000 mAh74 Wh 26,800 mAh99.16 Wh 50,000 mAh185 Wh 500 mAh1.85 Wh 1,000 mAh3.7 Wh

See Also

Frequently Asked Questions

How many Wh is 1 mAh?

1 mAh equals 0.0037 Wh at 3.7V (Li-ion nominal voltage). The exact Wh depends on the battery voltage: Wh = mAh × V / 1,000.

How do I convert 1 mAh to Wh?

Multiply 1 by the battery voltage, then divide by 1,000. At 3.7V: 1 × 3.7 / 1,000 = 0.0037 Wh.

Is 1 mAh allowed on a plane?

At 3.7V, 1 mAh = 0.0037 Wh. Airlines allow lithium batteries up to 100 Wh in carry-on luggage. Batteries between 100–160 Wh require airline approval. Batteries over 160 Wh are prohibited on passenger aircraft.

More mAh to Wh conversions

Formula: Wh = mAh × V / 1,000. Results assume nominal battery voltage.

Conversion factors verified against NIST, BIPM Based on SI definitions (BIPM). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes