# General and Scientific Calculator

> General and scientific calculator: do everyday math plus trig, powers, logs, and functions in one clean keypad. Free, private, runs locally, no signup.

- **Canonical URL:** https://boringtoolskit.com/general-scientific-calculator/
- **Category:** Everyday Calculators
- **Evidence level:** authored-methodology
- **Reviewed:** Reviewed July 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

General mode handles everyday arithmetic. Scientific mode adds trigonometry, logarithms, powers, constants, roots, factorial, memory, and DEG/RAD angle handling.

## Worked example

In General mode, 1 + 2 = 3. In Scientific DEG mode, sin(90) = 1.

## Assumptions

- Inputs are evaluated from the expression shown on screen.
- Degree/radian mode affects trig functions.
- Important financial, engineering, or scientific calculations should be independently checked.

## Common questions

### When should I use Scientific mode?

Use Scientific mode for trig, logs, powers, roots, constants, factorials, memory, or DEG/RAD calculations. Use General mode for simple arithmetic.

### Why does angle mode matter?

Trigonometric functions use the selected DEG or RAD mode, so sin(90) equals 1 in DEG mode but not in RAD mode.

### Are results sent to a server?

No. The calculation runs in your browser.

## Related tools

- /percentage-calc/
- /unit-conv/
- /profit-margin-markup-calculator/
- /electricity-cost-calculator/

## Sources

- [SI units and measurement references](https://www.nist.gov/pml/owm/metric-si)
- [Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811)

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