Density Calculator uses the density formula ρ = m/V to calculate the third value for two given values - density, mass, or volume of a substance. It also finds the densities of different substances and objects.

The Book of Answers is a free online tool that combines fun and practicality to provide answers and solutions, designed for those facing difficult choices in daily life, workplace decisions, and emotional dilemmas. With its unique interactive approach, it offers users an innovative way to aid decision-making, especially suitable for those occasionally troubled by indecision.

SWF Player is a free online player for SWF (Shockwave Flash) files. It can quickly open SWF files, read metadata tags from the file header, automatically resize the window to fit the SWF content, and display it.

Tip Calculator helps you know how much to tip when receiving services. Additionally, it also calculates how to split a bill and tip between a group of people.

Calorie Calculator can track your calorie burn and quickly estimate the calories burned based on activity and duration.

Significant Figures Calculator rounds numbers to the specified number of significant figures. It supports standard number format, e-notation, and scientific notation.

Electric Fan Simulator: Everything is great, except there's no wind! Electric Fan Simulator, it is a web app for simulating an electric fan without the breeze!

The HCG Doubling Time Calculator helps you calculate the doubling time of two beta hCG samples by entering the date of the blood test and the corresponding beta hCG value for that day. It also assists you in gauging your hCG levels and making sense of them at home during early pregnancy.

Future Value Calculator uses the formula FV = PV (1 + I/Y)ⁿ to find the future value (FV) of an investment with periodic deposits with given inputs of compounding periods (N), interest/yield rate (I/Y), starting amount, and periodic deposit/annuity payment per period (PMT).

Ideal Weight Calculator can calculate the optimal healthy body weight using various renowned equations, base on your age, gender, and height.

Roman Numerals Date Converter can convert dates from Arabic numerals to Roman numerals.

Work Hours Calculator assists employees in precisely determining the weekly number of hours worked, incorporating settings to accommodate breaks, hourly rounding, and military time.