Which online calculator should we build next?

Hi everyone,

I’m building CalcuLibrary, a free multilingual collection of online calculators for everyday life, finance, health, mathematics, business, automotive and engineering.

The library already includes scientific, percentage, mortgage, loan, compound interest, BMI, calorie, age, date, statistics and unit conversion tools. Everything works directly in the browser without registration.

I’d love to know which calculations you still find unnecessarily difficult or repeatedly solve with spreadsheets. Which calculator would save you the most time, and what features should it include?

I’ll use your feedback to decide which calculators and improvements to prioritize next.

Thanks for sharing your ideas!