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Evan Miller

I'm a software engineer who builds web applications and data tools. I personally implement and verify the formula and logic behind every calculator on Launch Hub. I publish them as free online tools so anyone can get an answer without signing up or paying.

Solar Irradiance Energy Output Calculator

This tool calculates expected solar energy output using local irradiance and system specifications. It helps eco-conscious individuals, sustainability professionals, and researchers model renewable energy generation. Use it to plan solar installations or evaluate green energy potential for a site.

Value Added Tax (VAT) Calculator

Calculate VAT amounts, inclusive and exclusive prices for your business transactions. This tool helps entrepreneurs, e-commerce sellers, and traders handle tax calculations for sales, invoicing, and pricing. It supports multiple VAT rates and regional formats common in global trade.

Radio Ad Cost Estimator

Estimate total radio advertising costs for your business campaigns in minutes. This tool helps entrepreneurs, small business owners, and marketing teams plan ad spend accurately. Factor in airtime rates, ad length, and broadcast frequency to stay on budget.

PvP Arena Ticket Efficiency Calculator

This tool helps competitive gamers and streamers calculate the efficiency of PvP arena ticket spending. It breaks down value per ticket based on rewards, win rates, and entry costs. Use it to optimize your in-game resource allocation for ranked arena…

Team Size Optimization Calculator

This tool helps small business owners, e-commerce sellers, and traders calculate the ideal team size for their operations. It factors in workload, available hours, and efficiency to prevent overstaffing or team burnout. Use it to align your staffing structure with…