What is Premeri for?
Convert length, area, mass, volume and temperature in one place. The tool is free, available in Serbian and English, and requires no account.
Every category includes unit relationships, a formula and worked examples. You can check the calculation as well as find the answer.
How to get your result
Choose a category, a starting unit and a target unit, then enter a number. A decimal point or comma is accepted; leave out spaces and thousands separators. The result updates immediately. Use the arrow button to swap units, or “Copy” to place the result on your device’s clipboard.
Conversion factors and rounding
Length, area, mass and volume use fixed relationships to a base unit. Temperature also uses offsets between scales: for example, °F = °C × 9/5 + 32.
Results display up to 12 significant digits. Long decimal results are rounded, and very small or large values may appear in scientific notation. Significant digits are different from decimal places.
Which units do we use?
Miles and feet are international land measures. A tonne is the metric tonne of 1,000 kg, and an ounce is the avoirdupois mass ounce. The gallon is the US liquid gallon, and the cup is the US customary cup of approximately 236.588 mL. These are labelled in the unit selectors.
The converter changes the unit of a known value. Converting mass to volume also requires the material’s density. To find a rectangle’s area, first calculate length × width.
Your calculations stay with you
Values are processed in your browser. We do not send them to a server or save a calculation history. Read our privacy policy for details about appearance preferences, hosting and privacy.