About Calcoala

Calcoala is a free collection of unit converters and everyday calculators. We built it because most conversion sites bury the tool under pop-ups and ads. Here, the tool comes first.

How we work

• Exact factors. Conversions use exact international definitions wherever they exist, such as 1 inch = 2.54 cm and 1 pound = 0.45359237 kg.
• Explained results. Every tool shows the formula and worked examples, so you can check the math.
• Respectful ads. Calcoala is funded by advertising, shown in a dedicated area that never covers the tool.
• Privacy first. Your inputs are calculated in your browser and never sent to us.

Corrections

Spotted an error or want a new tool? Write to us at hello@calcoala.com.