Scientific
Unit converter, percentage and rule of three calculator, and a Windows-style scientific calculator with standard and scientific modes.
Calculate percentages, percentage change, increases and decreases, and solve direct and inverse rule of three problems with step-by-step results. Free and online.
Unit ConverterConvert length, weight, temperature, volume, area, speed, time, computing and data transfer units instantly, with metric and binary prefixes. Free.
Windows CalculatorA Windows-style scientific calculator with standard and scientific modes, memory, trigonometry and keyboard shortcuts. Runs in your browser, no download.
The scientific section offers three everyday tools for students, technicians and professionals. The unit converter changes values between units of length, weight, temperature, volume, area, speed, time, computing and data transfer, with metric and binary prefixes, and each category has its own page. The percentage and rule of three calculator answers common questions such as the percentage of a value, increases, discounts and direct or inverse proportions. The Windows-style scientific calculator has standard and scientific modes, memory, trigonometric functions and keyboard shortcuts.
All tools are free, run online with nothing to install and need no sign-up. The calculator accepts input from your physical keyboard, just like the Windows app. In the converter, mind the difference between decimal and binary prefixes in computing: 1 GB is 10⁹ bytes, while 1 GiB is 2³⁰ bytes. In the percentage calculator, check whether a change is measured against the starting value or the final one. Results are rounded for everyday use, not for certified measurements.