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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.

Wedding Countdown Calculator

This wedding countdown calculator helps couples track the exact time remaining until their wedding day. It calculates days, hours, minutes, and seconds left, plus key milestone dates. Use it to stay organized as you approach your big day.

Windbreak Porosity Calculator

This tool helps farmers and agronomists calculate windbreak porosity to optimize crop protection and soil conservation. It accounts for common windbreak design factors used in field and orchard planning. Results guide adjustments to barrier density for better microclimate control.

Germination Rate Adjustment Calculator

This germination rate adjustment calculator helps farmers and agronomists adjust seed sowing rates based on expected field emergence loss. It accounts for lab germination results, seed weight, and field size to deliver accurate seeding recommendations. Use it to avoid over…

Curb Weight Calculator

This curb weight calculator helps car owners, fleet managers, and mechanics determine a vehicle’s true curb weight. It accounts for common aftermarket additions and fluid levels that impact official manufacturer weight specs. Use it to check compliance with towing limits,…

Upgrade Tier Cost Estimator

Estimate the total resources needed to upgrade items, characters, or gear through multiple tiers in your favorite games. This tool helps gamers, designers, and competitive players plan resource spending without overspending. It works for both video and tabletop games with…

Soup Serving Calculator

Plan the right amount of soup for your next meal, gathering, or weekly meal prep. This tool helps home cooks and hosts calculate servings based on recipe yield, portion size, and guest count. Avoid overbuying ingredients or running out of…

Beehive Honey Production Estimator

This tool helps beekeepers and agricultural producers estimate expected honey yields from their beehives. It factors in colony health, seasonal conditions, and management practices common in small and commercial apiaries. Use it to plan harvests, allocate resources, and project agribusiness…

GPS Distance Calculator

Calculate the straight-line distance between two GPS coordinates for trip planning, fuel cost estimates, or fleet route checks. This tool supports multiple distance units and works for any global location. Car owners, drivers, and fleet managers can use it to…

Magic Damage Calculator

This tool helps gamers, game designers, and tabletop players calculate expected magic damage output for video games, RPG sessions, and competitive play. It accounts for common modifiers like spell power, resistances, critical hits, and buffs. Use it to optimize character…