Electric Charge conversion

Convert Coulomb to Ampere-hour

1 coulomb (C) equals 0.000277777778 ampere-hour (Ah). Enter any value below to convert from C to Ah.

Enter a value and choose units. Results update instantly.

1 C = 0.0002777778 Ah

All Charge units

From 1 C
UnitValue
Nanocoulomb nC 999,999,999.9999998808
Microcoulomb μC 1,000,000
Millicoulomb mC 1,000
Coulomb C 1
Milliampere-hour mAh 0.2777777778
Ampere-hour Ah 0.0002777778
Elementary charge e 6.2415090745e18
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Formula

C to Ah conversion formula

Use this relationship for a direct conversion:

Ah = C x 0.000277777778

Worked example

2 C = 0.0005555556 Ah.

Ampere-hour relationships and the elementary charge value are exact.

Quick reference

Coulomb to Ampere-hour table

Coulomb (C)Ampere-hour (Ah)
0.010.0000027778
0.10.0000277778
10.0002777778
20.0005555556
50.0013888889
100.0027777778
250.0069444444
500.0138888889
1000.0277777778
1,0000.2777777778

From unit

About the coulomb

One ampere-second of electric charge.

Symbol: C

To unit

About the ampere-hour

Charge from one ampere sustained for one hour.

Symbol: Ah

Keep converting

Related conversions

Ampere-hour to CoulombReverse this conversion Coulomb to NanocoulombC to nCCoulomb to MicrocoulombC to μCCoulomb to MillicoulombC to mCCoulomb to Milliampere-hourC to mAhCoulomb to Elementary chargeC to e

Source

Conversion standard

Definitions are checked against BIPM SI Brochure: coulomb and elementary charge. Calculations use full internal precision before display rounding.

View the complete electric charge converter

Questions

C to Ah FAQ

How do you convert coulomb to ampere-hour?

Use the formula Ah = C x 0.000277777778. 1 coulomb (C) equals 0.000277777778 ampere-hour (Ah).

Is the C to Ah conversion exact?

Both unit definitions use exact factors. Only the displayed decimal may be rounded.