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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.

Swine Weight Calculator

Estimate live swine weight quickly without a scale using standard body measurements. This tool helps farmers, livestock managers, and agricultural students track animal growth for feeding, sales, or health checks. It works for common market pig breeds raised in commercial…

Transaction Cost Calculator

This tool helps entrepreneurs, e-commerce sellers, and traders calculate total transaction costs for sales. It accounts for payment processing fees, platform commissions, taxes, and other common business expenses. Use it to adjust pricing and protect your profit margins.

Date Add/Subtract Calculator

Quickly adjust dates for meal prep, event planning, or home project timelines. This tool helps you add or subtract days, weeks, or months from any starting date. Get clear, detailed results for scheduling everyday tasks without manual counting.

Customs Value Calculator

This customs value calculator helps importers, e-commerce sellers, and small business owners accurately determine the taxable value of imported goods. It accounts for all mandatory cost components required by customs authorities for duty and tax assessments. Use it to avoid…