Ah to Wh Converter

About This Tool

This tool provides rapid conversion between Ah and Wh to support battery sizing and energy budgeting. By supplying a rating in Ah along with system voltage, users obtain the equivalent energy in Wh. Conversely, providing a Wh value with voltage yields the corresponding Ah. It is suitable for engineers, technicians, makers, and procurement specialists who need precise energy figures for design and validation.

Conceptually, the calculation uses Wh = Ah × V, where V is voltage in volts. The reverse is Ah = Wh ÷ V. The tool enforces positive numeric inputs and a positive voltage, and can optionally present results in both directions for quick cross-check. It supports common voltages from small batteries to high-power systems, without applying efficiency losses.

Key value lies in speed, determinism, and consistency. Users can rely on a single source of truth for energy unit conversions, reducing errors when comparing battery specs, performing feasibility checks, or estimating runtime in simple scenarios. The tool is domain-agnostic and adheres to standard SI units, ensuring compatibility with datasheets and BOM calculations.

Use cases include sizing a 12 V lead-acid pack with 100 Ah to know its Wh capacity, planning a 24 V system, or converting Wh back to Ah for aging or capacity planning. The straightforward logic and fixed formatting simplify documentation and auditing, especially in engineering notebooks and supplier communications.

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