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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.

Straight Line Depreciation Calculator

Calculate annual and total straight line depreciation for business assets. This tool helps entrepreneurs, small business owners, and e-commerce sellers track asset value loss for tax and accounting purposes. Use it to plan budgets and comply with standard depreciation reporting…

Car Trade-In Value Estimator

Estimate the trade-in value of your car quickly and accurately. This tool helps car owners, fleet managers, and auto enthusiasts get a realistic valuation before visiting a dealership. Use it to prepare for negotiations or plan your next vehicle purchase.

Manure Management Volume Calculator

This tool helps farmers and farm managers estimate the volume of manure produced by livestock operations. It supports common livestock types and adjusts for storage and application factors. Use it to plan storage, transport, and field application schedules for manure.

Attendance Rate Calculator

Track employee or event attendance rates for your business, trade operation, or e-commerce team. This tool calculates attendance percentages, absenteeism rates, and related metrics to help you monitor team engagement. Use it to identify attendance trends and adjust workforce policies…