Key takeaway
Label the source unit before entering the number, keep full precision during the calculation and round only the displayed result.
Identify the quantity first
Length, area and volume use different factors. A linear conversion factor must be squared for area and cubed for volume.
Check the direction
Write the source unit beside the original value and confirm the target unit before calculating. This prevents a correct factor from being applied backwards.
Round at the end
Keep the calculator's full precision while working. Round the final answer to a level that matches the measurement or task.
