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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.

Ozone Layer Recovery Timeline Calculator

This tool estimates the projected recovery timeline of the stratospheric ozone layer using current ozone-depleting substance trends. It helps eco-conscious individuals, sustainability professionals, researchers, and policy advocates track progress toward restoring pre-1980 ozone levels. Use it to model how policy…

Co-op Mode Score Multiplier Calculator

Calculate co-op score multipliers for video games, tabletop sessions, and competitive gaming events. This tool helps gamers, game designers, and streamers adjust scoring based on team size, difficulty, and performance modifiers. Get accurate, balanced score adjustments without manual math.

Electric Fence Energy Cost Calculator

Estimate the energy costs and carbon footprint of operating an electric fence for agricultural, wildlife management, or property protection use. This tool helps eco-conscious landowners, sustainability professionals, and researchers balance operational needs with environmental impact goals. Get clear breakdowns of…

Microfinance Repayment Calculator

Estimate monthly repayments and total costs for microfinance loans. This tool helps loan applicants, budget planners, and individuals assess affordable borrowing options. It factors in interest rates, repayment terms, and fees common in microfinance lending.

APR Calculator

This APR calculator helps individuals and loan applicants estimate the true annual cost of borrowing. It factors in interest rates, fees, and loan terms to give a clear picture of total loan expenses. Use it to compare loan offers or…

Livestock Feed Cost Estimator

This tool helps farmers and farm managers calculate total feed costs for their livestock. It accounts for animal count, daily feed intake, and feed type pricing. Use it to budget for seasonal feed changes or herd expansion.

Allotment Garden Plot Calculator

Plan your allotment garden plot with this simple calculator. It helps home gardeners estimate space, crop yields, and resource needs for their plot. Adjust inputs to match your gardening goals and local growing conditions.

Weekly Meal Prep Time Estimator

Estimate how long your weekly meal prep will take with this simple, adjustable tool. It helps home cooks, busy professionals, and anyone managing weekly meal planning save time and reduce stress. Input your prep details to get a tailored time…

Bird Feeder Seed Amount Calculator

This tool helps backyard bird watchers and home managers estimate how much bird seed they need for their feeders. It accounts for feeder type, bird species, and refill frequency to avoid overbuying or running out. Use it to plan weekly…