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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.

XP Multiplier Duration Calculator

Calculate how long it will take to reach your target XP with active multipliers. Perfect for gamers tracking progression, game designers balancing leveling systems, and streamers planning content milestones. Works for both video games and tabletop RPGs with variable XP…

Multi-Currency Pricing Calculator

Calculate accurate product prices across multiple currencies for international sales. This tool helps e-commerce sellers, traders, and small business owners account for exchange rates, fees, and margins. Adjust pricing strategies to stay competitive in global markets.

Storage Cost Calculator

Calculate total storage costs for your business inventory, e-commerce stock, or trade goods. This tool helps entrepreneurs, small business owners, and e-commerce sellers budget for warehousing and storage expenses. Get a detailed breakdown of fixed and variable storage fees to…

Taxable vs Tax-Deferred Account Comparison

This tool compares growth between taxable and tax-deferred investment accounts over time. It helps individual savers, financial planners, and anyone managing personal investment portfolios. Use it to estimate how taxes impact long-term returns based on your contribution and rate assumptions.

Dissertation Word Count Calculator

This tool helps students, academic advisors, and educators plan dissertation writing timelines by calculating required daily word counts. It accounts for total word targets, writing days, and buffer time for revisions. Use it to stay on track with academic submission…

Refinance Break-Even Calculator

Estimate how long it takes for mortgage refinancing savings to cover closing costs. This tool helps homeowners, loan applicants, and financial planners make informed refinancing decisions. Input your current and new loan details to get a clear break-even timeline.

Portfolio Rebalancing Calculator

This tool helps individual investors and financial planners calculate adjustments needed to align portfolio asset allocations with target goals. It supports multiple asset classes, current and target weights, and total portfolio value inputs. Use it to avoid drift and maintain…

Harvest Moon Date Calculator

Plan seasonal meals, garden harvests, or outdoor events with this Harvest Moon date calculator. It finds the exact date of the Harvest Moon for any year you enter. Perfect for home cooks, gardeners, and anyone tracking lunar cycles for daily…