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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.

In-Game Loot Box ROI Calculator

This tool helps gamers and game designers calculate the return on investment for in-game loot box purchases. It factors in item values, drop rates, and purchase costs to show if a loot box set is worth the spend. Use it…

Sick Leave Cost Calculator

Small business owners and e-commerce sellers can use this tool to estimate the total cost of employee sick leave. It accounts for wages, benefits, and temporary coverage expenses. Use the results to budget for unexpected staff absences.

Cubic Equation Solver

Solve cubic equations of the form ax³ + bx² + cx + d = 0 quickly for math class, homework, or exam prep. This tool is designed for students, teachers, and academic advisors needing fast, accurate root calculations. It supports…

Sunlight Duration Calculator

Calculate how much direct sunlight your outdoor space, garden, or balcony receives each day. This tool helps home cooks, plant owners, and anyone planning outdoor activities align their schedules with available sunlight. It simplifies daily personal planning around natural light…

Logistics Efficiency Score Calculator

This tool helps e-commerce sellers, small business owners, and trade professionals measure the efficiency of their logistics operations. It calculates a weighted composite score based on six key supply chain metrics to identify improvement opportunities. Use it to benchmark your…

Castle Level Upgrade Cost Calculator

This tool calculates the total resources and time needed to upgrade your castle to a target level in strategy video games. It helps gamers, game designers, streamers, and competitive players plan resource allocation for progression. Use it to avoid overspending…

Customer Acquisition Funnel Calculator

This tool helps entrepreneurs, e-commerce sellers, and sales teams model their customer acquisition funnel performance. It calculates key conversion metrics across funnel stages to identify optimization opportunities. Use it to forecast lead volume, conversion rates, and acquisition costs for your…