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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.

Average Order Value Growth Calculator

This tool helps e-commerce sellers, small business owners, and trade professionals calculate average order value growth over time. It supports planning pricing strategies and tracking sales performance against growth targets. Use it to align sales efforts with revenue goals for…

Refrigeration Capacity Calculator

This tool helps small business owners, traders, and e-commerce sellers calculate required refrigeration capacity for perishable inventory storage. It accounts for product type, storage volume, and ambient conditions to deliver accurate sizing estimates. Use it to avoid over or under-investing…

Personal Loan Cost Planner

Estimate total repayment, monthly installments, and total interest for personal loans. Designed for loan applicants, budget planners, and anyone comparing borrowing options. Quickly see how loan terms and rates affect your total costs.

Stealth Kill Probability Calculator

This tool calculates stealth kill success probabilities for video games, tabletop RPGs, and competitive gaming scenarios. It helps gamers, game designers, and streamers model RNG-based stealth mechanics. Adjust inputs to match your game’s current meta or patch values.

Nail Growth Rate Calculator

Estimate how fast your nails grow with this simple tool. It helps anyone track nail growth for personal care, manicure planning, or health monitoring. Get personalized growth projections based on your habits and nail type.

529 College Savings Calculator

This 529 college savings calculator helps parents, students, and financial planners estimate future education fund balances. It factors in regular contributions, expected investment returns, and tax advantages tied to 529 plans. Use it to align your savings strategy with projected…