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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.

Timber Carbon Footprint Calculator

Estimate the carbon footprint of timber products across their full lifecycle. This tool helps eco-conscious individuals, sustainability professionals, and researchers assess the environmental impact of timber use. It accounts for harvest, processing, transport, and end-of-life emissions.

Income Tax Calculator

Estimate your annual federal income tax liability with this straightforward tool. It helps individuals managing personal budgets, loan applicants, and financial planners make informed money decisions.

Compound Interest Monthly Calculator

Calculate how your savings or investments grow with monthly compounding. This tool helps savers, loan applicants, and financial planners estimate future balances accurately. It factors in regular contributions and variable interest rates for real-world planning.

Room and Board Calculator

Estimate total room and board costs for a full academic year with this tool. It helps students, parents, and academic advisors budget for on-campus or off-campus housing and meal plans. Use it to compare different housing options and plan education…

Social Media Engagement Rate Calculator

This tool helps entrepreneurs, e-commerce sellers, and marketing teams measure how well their social media content resonates with audiences. It calculates engagement rates across major platforms using standard industry metrics. Use it to benchmark campaign performance and adjust your social…

Joint Tenancy vs Tenants in Common Tax Calculator

This tool helps property co-owners compare tax implications of joint tenancy and tenants in common ownership structures. It calculates potential capital gains tax, inheritance tax exposure, and ownership share impacts for real estate or asset holdings. Use it to make…

Percentage Calculator

This percentage calculator helps students, teachers, and parents track academic performance quickly. It calculates test scores, assignment percentages, and progress toward learning goals. Use it for grading, grade planning, or monitoring improvement over time.

Subscription Upgrade Revenue Calculator

This tool helps e-commerce sellers, entrepreneurs, and small business owners estimate revenue from subscription plan upgrades. It calculates total upgrade revenue, average revenue per upgraded user, and conversion impact. Use it to plan pricing changes and growth strategies for your…

Turnover Cost Calculator

Estimate the total cost of employee turnover for your business. This tool helps entrepreneurs, small business owners, and e-commerce sellers quantify turnover expenses. Use the results to adjust retention strategies and budget for hiring.