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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.

Employee Engagement ROI Calculator

This tool helps small business owners, e-commerce sellers, and trade teams measure the return on investment of employee engagement initiatives. It calculates financial gains from reduced turnover, higher productivity, and lower recruitment costs. Use it to justify engagement program spending…

Lump Sum Pension vs Monthly Payment Calculator

This calculator helps individuals compare a one-time pension lump sum to regular monthly payments. It factors in interest rates, life expectancy, and tax considerations for personal financial planning. Use it to make informed retirement income decisions.

Fish Pond Stocking Density Calculator

Helps fish farmers and aquaculture managers calculate optimal stocking density for freshwater ponds. Ensures healthy fish growth, minimizes disease risk, and maximizes yield per unit area. Suitable for tilapia, catfish, carp, trout, and other common farmed fish species.

Cash Yield Calculator

Calculate the cash yield of your savings, certificates of deposit, or other interest-bearing cash investments. This tool helps savers, loan applicants, and financial planners compare returns across personal finance products. Get clear pre-tax and post-tax yield breakdowns to inform your…

Self-Directed IRA Fee Calculator

Estimate total fees and their impact on your self-directed IRA growth over time. This tool helps individual investors and financial planners compare fee structures across different account providers. Use it to see how small fee differences add up to thousands…

Flower to Fruit Ratio Calculator

This tool helps farmers and agronomists calculate the ratio of flowers to mature fruit on crop plants. It supports common fruiting crops including tomatoes, apples, and citrus. Use it to assess pollination efficiency and yield potential for your harvest.

Flower Arrangement Planner

Plan the perfect floral display for any event with this flower arrangement planner. It helps home decorators, event hosts, and hobbyists calculate stem counts, vase sizes, and budget needs. Get precise, actionable numbers for your next arrangement in seconds.