Shoe Size Converter
Quickly convert shoe sizes between US, UK, EU, and CM standards for men, women, and kids. Perfect for online shoppers, travelers, or anyone buying footwear across regions. Avoid sizing mishaps with accurate, instant conversions.
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.
Freshwater Availability Index Calculator
This tool calculates the Freshwater Availability Index for any region using local water supply and demand data. It helps sustainability professionals, researchers, and policy advocates assess regional water security risks. Use it to inform conservation planning and resource allocation decisions.
Farm Profit Per Acre Calculator
This tool helps farmers, agronomists, and farm managers calculate net profit per acre for crop and livestock operations. It factors in yield, input costs, fixed expenses, and market prices to deliver accurate per-acre profitability figures. Use it to evaluate crop…
How to Calculate Stealth Kill Probability: The Math Behind Guaranteed Assassinations
How To Calculate Stealth Kill Probability: The Universal Formula If you want a straight answer to how to calculate stealth kill probability, here it is: P(Kill) = P(Undetected) × P(Hit) × P(Lethal). This equation states that your overall chance of…
How to Compare Bicycle vs Car Emissions: Build Your Own DIY Toolkit
The Real Way to Compare Bicycle vs Car Emissions (Not Just a Stat List) If you want to know how to compare bicycle vs car emissions for your own life, skip the headline numbers like ‘e-bikes are 90% cleaner.’ Those…
City Tree Canopy Benefit Calculator
This tool estimates the environmental, economic, and social benefits of urban tree canopies. It helps city planners, sustainability professionals, and eco-conscious residents quantify the value of green infrastructure projects. Use it to support policy proposals, grant applications, or community tree…
Scientific Notation Converter
This tool converts numbers between standard decimal form and scientific notation. It helps students, teachers, and academic staff handle large or small values in math, physics, and chemistry coursework. Quickly switch between formats without manual calculation errors.
DAP Delivery Calculator
Calculate total Delivered at Place (DAP) delivery costs for international trade shipments. This tool helps e-commerce sellers, traders, and small business owners estimate landed costs accurately. Use it to set competitive pricing and avoid unexpected logistics expenses.
Foreign Pension Reporting Calculator
This tool helps individuals and financial planners estimate foreign pension amounts to report for tax and budgeting purposes. It accounts for exchange rates, contribution periods, and local tax rules. Use it to prepare accurate financial records for cross-border retirement planning.
How to Calculate Timber Carbon Footprint by Hand: A DIY Guide From Tree to CO2e
If you want to know how to calculate timber carbon footprint without proprietary LCA software, the core method is simple: measure your wood volume, multiply by density and lifecycle emission factors, then subtract the biogenic CO2 the wood stores. In…