Classification scale
Extra-heavy (<10)
Heavy (10-25)
Medium (25-35)
Light (>35)
Formula: API = 141.5 / SG - 131.5
Formula: SG = 141.5 / (API + 131.5)
Formula: Mass (kg) = SG x 158.99 x Volume (bbl)
Note: 1 barrel = 0.158987 m3
Key crude benchmarks - click any row to load values