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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.

Credit Card Payoff Calculator

Estimate how long it will take to pay off your credit card balance with this calculator. It helps individuals managing personal budgets, loan applicants, and financial planners plan debt repayment. Input your balance, interest rate, and monthly payment to get…

Wealth Accumulation Planner

This tool helps individuals and financial planners estimate long-term wealth growth from regular savings and investments. It accounts for compounding interest, contribution changes, and varying time horizons. Use it to set realistic savings targets and adjust strategies for your financial…

Brake Pad Wear Calculator

This tool helps car owners, fleet managers, and mechanics estimate remaining brake pad life based on driving habits and vehicle specs. It calculates wear using mileage, pad material, and common driving conditions. Use it to plan maintenance and avoid unexpected…

P-Value Calculator

This tool calculates p-values for common statistical tests used in academic coursework and research. Students, teachers, and academic advisors can use it to verify hypothesis test results quickly. It supports z-tests, t-tests, and chi-square tests with clear input options.

Yeast to Baking Powder Converter

Home cooks often need to swap yeast for baking powder when a recipe calls for one but they only have the other. This tool calculates the correct substitution ratio based on your recipe’s requirements. It helps avoid dense baked goods…

Annual CO2 Budget Calculator

This tool helps eco-conscious individuals, sustainability professionals, and researchers estimate their annual carbon dioxide emissions. It calculates total CO2 output across household energy, transportation, flights, and waste categories. Use the detailed breakdown to identify high-impact areas for emission reduction in…

Green Hydrogen Cost Calculator

Estimate the production cost of green hydrogen for sustainability projects, research, or policy planning. This tool calculates levelized cost of hydrogen using renewable energy inputs, electrolyzer specs, and regional cost variables. Get a detailed breakdown to support informed decision-making for…

Rose Hip Seed Oil Blend Calculator

This tool helps home cooks and skincare enthusiasts calculate precise rose hip seed oil blend ratios for recipes or DIY personal care products. Adjust carrier oil, essential oil, and dilution percentages to match your specific needs. Get exact measurements in…