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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.

Combined Leverage Calculator

This tool calculates combined leverage for personal finance and investment planning. It helps individuals, loan applicants, and financial planners assess total risk from operating and financial leverage. Use it to evaluate how fixed costs and debt impact your earnings volatility.

Baking Conversion Calculator

Home bakers often need to switch between measurement units for recipes from different regions. This tool helps you convert common baking ingredients between volume, weight, and count units quickly. It’s useful for adjusting recipes, substituting ingredients, or scaling batches for…

APY Calculator

Calculate the annual percentage yield (APY) for your savings or investment accounts. This tool helps savers, loan applicants, and financial planners compare interest-bearing accounts accurately. It factors in compounding frequency to show true annual returns.

Adventure Mode Completion Estimator

Estimate how long it will take to complete an adventure mode in your favorite video or tabletop game. This tool helps gamers, streamers, and game designers plan play sessions and balance content. Input your playstyle, game parameters, and pacing to…

Standby Letter of Credit Fee Estimator

Estimate standby letter of credit fees for international trade transactions. This tool helps entrepreneurs, traders, and small business owners plan trade finance costs upfront. Use it to evaluate fee structures before finalizing cross-border trade agreements.

Nanny Cost Estimator

Estimate your monthly and annual nanny expenses with this simple tool. It helps parents and households budget for in-home childcare costs accurately. Adjust inputs for hours, rates, and benefits to match your specific arrangement.

Staffing Needs Calculator

Helps small business owners, e-commerce sellers, and entrepreneurs estimate required headcount to meet operational demands. Calculates staffing needs based on sales volume, task time, and employee availability. Use it to plan hiring, manage labor costs, and avoid under or overstaffing.

Farrowing Crate Sizing Calculator

This tool helps pig farmers and livestock managers calculate optimal farrowing crate dimensions for sows. It accounts for breed size, litter count, and farm setup to balance animal welfare and operational efficiency.