All conversions use trusted constants and formulas. For most categories (length, mass, speed, data, etc.), results are exact to many decimal places. For complex cases like temperature or fuel economy, we apply the proper formulas automatically.

Yes. The entire converter runs locally in your browser. Once the page has loaded, no internet connection or external service is required.

We cover a wide library of categories: length, mass, area, volume, speed, time, temperature, pressure, energy, power, data (SI & binary), angle, frequency, fuel economy, and torque — with both metric and imperial options.

Yes, but always double-check critical engineering or scientific calculations. This tool is designed for fast, reliable everyday conversions.

No. All inputs and results are processed entirely on your device. Nothing is saved, logged, or transmitted.