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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.

Rarity Tier Drop Rate Calculator

This tool calculates drop rate probabilities for specific rarity tiers in video, tabletop, and gacha games. It accounts for common pity systems, base drop rates, and total pull counts to generate detailed odds breakdowns. Gamers, game designers, and streamers can…

Consignment Cost Calculator

This tool helps e-commerce sellers, small business owners, and traders calculate total consignment costs for their inventory. It factors in base product costs, shipping, platform fees, and other trade-related expenses. Use it to set accurate pricing and protect your profit…

Student Loan Refinance Calculator

Estimate how much you can save by refinancing your student loans. Compare your current loan terms with new refinance options to see monthly payment changes and total interest savings. It helps borrowers, financial planners, and anyone managing student debt make…

AdSense Revenue Estimator

Estimate potential earnings from your Google AdSense monetized website or blog. This tool helps entrepreneurs, e-commerce sellers, and content creators project monthly and annual ad revenue. Use real traffic and engagement metrics to plan your monetization strategy.