mAh to Ah Calculator

Q: How do I convert mAh to Ah?

Divide the milliamp-hours by 1,000. For example, 20,000 mAh ÷ 1,000 = 20 Ah. Because 1 Ah equals 1,000 mAh, the conversion simply moves the decimal point three places to the left.

Q: How many Ah is 10,000 mAh?

10,000 mAh equals 10 Ah, because 10,000 ÷ 1,000 = 10. This is the charge capacity only; the stored energy also depends on the battery voltage.

Q: Is a 20,000 mAh power bank really 20 Ah of usable charge?

The cells store 20 Ah at their nominal 3.7 V, but power banks output 5 V USB. After the voltage step-up and conversion losses, the usable charge at 5 V is lower — typically around 12,000–14,000 mAh at 5 V. The 20 Ah figure is the raw cell capacity.

Q: What is the difference between mAh and Ah?

They measure the same thing — battery charge capacity — at different scales. 1 Ah = 1,000 mAh. Small batteries are usually rated in mAh; larger batteries such as car or solar batteries are rated in Ah.

Reviewed by the ElectricalConverters editorial team Last updated July 2026 Estimates only — how we check

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Milliamp-hours (mAh)

RESULT — CAPACITY

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Formula: Ah = mAh ÷ 1,000

How do you convert mAh to Ah?

Divide milliamp-hours by 1,000. A 20,000 mAh power bank equals 20,000 ÷ 1,000 = 20 Ah. A 3,000 mAh 18650 cell is 3 Ah. Because 1 Ah = 1,000 mAh, the conversion is a simple decimal shift — useful when a spec sheet lists a phone battery in mAh but a solar charger in Ah.

mAh to Ah Formula

Ah = mAh ÷ 1,000

The prefix "milli" means one-thousandth, so 1,000 milliamp-hours make one amp-hour. Dividing by 1,000 shifts the decimal three places, turning 20,000 mAh into 20 Ah. Note that mAh describes charge only — to compare energy, first convert to watt-hours with the battery voltage.

mAh to Ah Conversion Table

Milliamp-hours	Amp-hours	Typical example
500 mAh	0.5 Ah	Small remote / toy
1,500 mAh	1.5 Ah	AA NiMH cell
2,000 mAh	2 Ah	Older smartphone
3,000 mAh	3 Ah	18650 Li-ion cell
10,000 mAh	10 Ah	Compact power bank
20,000 mAh	20 Ah	Large power bank
50,000 mAh	50 Ah	Portable jump starter

Frequently Asked Questions

How do I convert mAh to Ah?

Divide the milliamp-hours by 1,000: Ah = mAh ÷ 1,000. For example, 20,000 mAh ÷ 1,000 = 20 Ah — just move the decimal three places left.

How many Ah is 10,000 mAh?

10,000 mAh equals 10 Ah (10,000 ÷ 1,000). That is charge capacity only — energy also depends on voltage.

Is a 20,000 mAh power bank really 20 Ah of usable charge?

The cells hold 20 Ah at their 3.7 V nominal voltage, but the bank outputs 5 V USB. After the voltage step-up and losses, usable charge at 5 V is lower — often ~12,000–14,000 mAh. To compare fairly, convert to energy with our mAh to Wh tool.

What is the difference between mAh and Ah?

They measure the same thing — charge capacity — at different scales: 1 Ah = 1,000 mAh. Small cells are rated in mAh; car and solar batteries are rated in Ah.