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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.

Food Waste Calculator

Estimate how much food your household throws away each month and the total cost of that waste. This tool helps home cooks and everyday households track avoidable waste from meal prep, leftovers, and pantry items. Use the results to adjust…

Air Fryer Conversion Calculator

Convert conventional oven recipes for air fryer use with this simple tool. It helps home cooks adjust temperature, cook time, and serving sizes for crispy, evenly cooked results. Save time and avoid overcooking when switching between appliances.

Retail Floor Space Productivity Calculator

This tool helps retail business owners and store managers measure how efficiently their selling space generates revenue. It calculates key productivity metrics to guide layout adjustments, pricing, and inventory decisions. Use it to optimize your physical retail space for better…

Sales Tax Calculator

Calculate sales tax for purchases, online orders, or personal budget planning in seconds. This tool helps individuals, shoppers, and financial planners quickly determine total costs including local and state tax rates. Use it to avoid overspending and stay on top…

Herbicide Application Rate Calculator

This tool helps farmers and agronomists calculate precise herbicide application rates for crop fields. It accounts for field size, product concentration, and application method to avoid under or over-treatment. Use it to optimize chemical use, reduce waste, and protect crop…

Box Size Calculator

This tool helps e-commerce sellers, traders, and small business owners calculate optimal box dimensions for shipping products. It factors in product dimensions, padding, and item count to reduce wasted space and shipping costs. Use it to streamline your packaging workflow…

Times Interest Earned Calculator

Calculate your times interest earned ratio to assess your ability to cover debt payments. This tool helps individuals, loan applicants, and financial planners evaluate personal or business debt service capacity. Use it to prepare for loan applications or adjust your…