121 mAh Is How Many Wh?

Quick Answer: 121 mAh = 0.4477 Wh (at 3.7V)

mAh → Wh Wh → mAh
Milliamp-hours
=
Watt-hours
Auto-fills voltage
Nominal battery voltage
Conversion Result
121 mAh = 0.4477 Wh (at 3.7V)

At 3.7V nominal voltage

121 mAh = 0.4477 Wh (at 3.7V)

Step-by-step:

  1. Formula: Wh = mAh × V / 1,000
  2. 121 × 3.7 / 1,000 = 0.4477 Wh

Similar mAh to Wh Conversions

Values close to 121 mAh (at 3.7V Li-ion):

mAh Wh (at 3.7V)
1 mAh 0.0037 Wh
101 mAh 0.3737 Wh
201 mAh 0.7437 Wh
301 mAh 1.1137 Wh
401 mAh 1.4837 Wh
501 mAh 1.8537 Wh
601 mAh 2.2237 Wh

Popular mAh to Wh Conversions

1,000 mAh3.7 Wh 1,500 mAh5.55 Wh 2,000 mAh7.4 Wh 2,500 mAh9.25 Wh 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

See Also

Frequently Asked Questions

How many Wh is 121 mAh?

121 mAh equals 0.4477 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 121 mAh to Wh?

Multiply 121 by the battery voltage, then divide by 1,000. At 3.7V: 121 × 3.7 / 1,000 = 0.4477 Wh.

Is 121 mAh allowed on a plane?

At 3.7V, 121 mAh = 0.4477 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