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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.

Net Zero Building Cost Calculator

Estimate the total upfront and lifecycle costs of constructing a net zero energy building. This tool helps sustainability professionals, architects, and eco-conscious homeowners compare green building options. It factors in renewable systems, efficiency upgrades, and regional utility incentives.

Fermented Vegetable Salt Ratio Calculator

This tool helps home cooks calculate the correct salt ratio for fermenting vegetables at home. It adjusts for vegetable type, fermentation method, and batch size to ensure safe, flavorful results. Use it to avoid over- or under-salting your fermented batches.

Package Weight Calculator

This tool helps e-commerce sellers, small business owners, and traders calculate total package weight for shipping. It accounts for product weight, packaging materials, and quantity to simplify logistics planning. Use it to avoid shipping overcharges or delays from incorrect weight…

Annual Income to Hourly Rate Calculator

This tool converts your annual pre-tax or post-tax income to an equivalent hourly rate. It helps individuals managing personal budgets, loan applicants, and financial planners estimate take-home pay per hour. Use it to compare job offers, plan side hustles, or…

Shopping Discount Calculator

Quickly calculate final prices after discounts, compare multiple offers, and track savings for everyday shopping trips. It helps budget-conscious consumers, home cooks, and anyone managing household expenses make informed purchase decisions. No complex math required—get clear savings breakdowns in seconds.

Cleaning Schedule Time Calculator

Estimate how long your household cleaning tasks will take to plan your schedule effectively. This tool helps home managers, busy individuals, and anyone organizing daily chores allocate time accurately. Adjust inputs for different home sizes, task types, and cleaning intensities…

Debt to Equity Ratio Calculator

Calculate your debt to equity ratio to assess your financial leverage. This tool helps personal budget managers, loan applicants, and financial planners evaluate debt burden relative to owned assets. Use it to prepare for loan applications or adjust your debt…

Institutional Ownership Value Calculator

This tool helps individuals and financial planners estimate the total value of institutional ownership in a portfolio or asset. It’s useful for loan applicants, savers, and anyone tracking how much of an asset is held by large financial institutions. Use…