Battery Ampere-hour (Ah) Calculator
Calculate battery capacity in Ampere-hours from current, discharge time, or Watt-hours and voltage.
Battery Ampere-hour (Ah) Calculator
Compliant with IEEE 1188 Standards
Results:
Ampere-hour (Ah): 0.00
How to Use the Calculator
Calculate from Current & Discharge Length
- Select "Current & Discharge Length" as the calculation method.
- Enter the current flow in Amps (A).
- Provide the discharge length in hours (h).
- Click "Calculate" to get the Ampere-hour (Ah).
Calculate from Watt-hour & Voltage
- Select "Watt-hour & Voltage" as the calculation method.
- Enter the Watt-hour (Wh) capacity.
- Provide the Battery Voltage (V).
- Click "Calculate" to get the Ampere-hour (Ah).
General Tips
- Ensure all input values are positive numbers.
- Use the "Reset" button to clear all fields and results.
- Ampere-hour (Ah) is a measure of battery charge capacity.
Understanding Ampere-hour (Ah)
What is Ampere-hour (Ah)?
Ampere-hour (Ah) is a unit of electric charge, indicating the amount of charge a battery can deliver at a constant current for one hour. It's a common measure of battery capacity.
- Higher Ah means longer discharge time or more power delivery.
- Crucial for sizing batteries in various applications.
Factors Affecting Ah
- Discharge Rate: Higher discharge rates can reduce usable Ah.
- Temperature: Extreme temperatures can impact battery performance and capacity.
- Battery Age: Capacity typically degrades over time and charge cycles.
- Depth of Discharge: Repeated deep discharges can shorten battery lifespan.
Key Formulas:
From Current & Discharge Length: Ah = Current Flow (A) × Discharge Length (h)
From Watt-hour & Voltage: Ah = Watt-hour (Wh) / Battery Voltage (V)
Calculation Formulas
Ampere-hour (Ah) from Current & Discharge Length:
Ah = Current Flow (A) × Discharge Length (h)
Ampere-hour (Ah) from Watt-hour & Voltage:
Ah = Watt-hour (Wh) / Battery Voltage (V)
Example Calculations
Example 1: From Current & Discharge Length
Current Flow: 5 A
Discharge Length: 20 h
Ah = 5 A × 20 h = 100 Ah
Example 2: From Watt-hour & Voltage
Watt-hour: 1200 Wh
Battery Voltage: 12 V
Ah = 1200 Wh / 12 V = 100 Ah