Omnicalculator

Omni Calculator offers 3924 free calculators covering biology, chemistry, construction, conversion, ecology, everyday life, finance, food, health, math, physics, sport and statistics, plus a set of other tools. Its calculators include tools for p-value, confidence intervals, test grades, logarithms, sales tax, significant figures, scientific notation, square footage, percentage increase and exponents.

An About page states the site aims to make every calculation-based problem trivial to solve, covering questions such as whether to buy or rent, ideal calorie intake, loan affordability and lemonade-stand break-even points. Its ads.txt file lists 88 ad system lines, with 49 direct and 72 reseller, naming Ascendeum Co and Gourmet Ads Pty Limited as sales houses.