Different estimation tools for the Levelized Cost of Ammonia (LCOA) yield a broad range of predicted green ammonia prices, with estimates ranging from $700 to $1800 per ton. These discrepancies raise concerns about the reliability of these tools for policymaking and decision-making. An analysis reveals that the tools rely on a wide variety of economic and technical assumptions. The breakdown shows that renewable energy generation and electrolysis contribute up to 70% of the costs in green ammonia production. Significant improvements are needed in these tools to enhance confidence in LCOA estimates and support the adoption of green ammonia.