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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.

Dimensional Weight Calculator

E-commerce sellers and trade businesses use this tool to calculate dimensional weight for shipping quotes. It helps avoid unexpected carrier fees by aligning package measurements with carrier-specific rules. Get accurate shipping cost estimates before finalizing orders.

Product Demo Conversion Calculator

This tool helps sales teams, e-commerce sellers, and entrepreneurs calculate conversion rates from product demos. It breaks down key metrics to optimize demo-to-sale performance for trade and business operations. Use it to assess the effectiveness of your product demonstration strategy.

Terrarium Size Calculator

Calculate the ideal terrarium size for your plants, reptiles, or small pets. This tool helps home hobbyists and pet owners avoid overcrowding enclosures. Get precise dimensions and volume recommendations tailored to your specific setup.

Alcohol Dilution Calculator

Calculate how much water or neutral spirit to add to adjust the alcohol by volume (ABV) of a liquid. Perfect for home brewers, bartenders, and anyone making infused spirits or cocktails at home. Get precise dilution measurements without guesswork.

Sparkling Water Carbonation Level Calculator

This tool helps home cooks and everyday consumers estimate the carbonation level of homemade or store-bought sparkling water. Adjust inputs to match your preferred fizz intensity for drinks, cocktails, or daily hydration. It simplifies balancing carbonation for personal taste and…

Clean Air Zone Cost Estimator

Estimate costs for driving in clean air zones across UK and European cities. This tool helps eco-conscious drivers, sustainability professionals, and policy advocates budget for emission-based zone entry fees. Input your vehicle details and trip frequency to get accurate cost…

Mythic Dungeon Keystone Level Calculator

This tool calculates mythic dungeon keystone level changes for World of Warcraft players based on run performance. It factors in completion time, player deaths, and seasonal affixes to show potential key upgrades or downgrades. Use it to plan weekly mythic+…