Scientific Calculator Pro
Trigonometric functions, logarithms, powers and calculation history
How to use a scientific calculator?
A scientific calculator is an essential tool for students, engineers and scientists. It goes far beyond basic arithmetic by integrating advanced mathematical functions like trigonometry, logarithms and powers.
Trigonometric functions
The sin, cos and tan functions calculate the ratios between sides of a right triangle. Sine is the ratio of the opposite side to the hypotenuse. These functions are fundamental in physics, engineering and architecture.
Logarithms and DEG/RAD mode
The common logarithm (log₁₀) is the inverse of the power of 10. The natural logarithm (ln) is the inverse of e^x. Angles can be expressed in degrees (0° to 360°) or radians (0 to 2π): 180° = π radians.
Why choose OmniTools?
OmniTools brings together 20+ carefully crafted online tools built by our team. Every tool is designed to be fast, accurate and usable without sign-up. We believe essential everyday utilities — calculators, converters, generators — should be freely available with a clean interface and no intrusive ads. Our commitment: your data never leaves your browser.
Our tools are used daily by students, real-estate professionals, developers, designers, travelers and curious minds. Each tool comes with detailed documentation, formulas, reference values and practical tips to help you get the most out of it. We regularly ship new tools and improvements based on community feedback.
Frequently asked questions
Is the calculator free?
Yes, every feature is 100% free, with no sign-up and no usage limit.
Does it work offline?
Once the page is loaded, calculations run in your browser and do not require an Internet connection.
What is the difference between DEG and RAD?
DEG (degrees) uses the 0-360° scale. RAD (radians) uses 0 to 2π. Use DEG for geometry, RAD for mathematical analysis.
Can I see my calculation history?
Yes, every operation is kept during your session so you can review previous steps.