ONLINTools - 60+ free calculators and practical guides

Hi Product Hunt — I’m the maker of ONLINTools. I built it to make everyday calculations easier to understand, not just faster to run. It currently includes 60+ free calculators and practical guides across health, finance, photography, date and time, and developer tasks. Standard tools work without an account.

I focused on clear inputs, immediate results, formulas or methodology, and plain-language explanations of assumptions and limits. Recent additions include steps-to-miles and photography tools for exposure, depth of field, crop factor, shutter speed, flash, and print size.

I’d especially value feedback on which calculators need clearer explanations or examples, and which everyday questions should be covered next.