The propane-to-crude ratio — a key indicator of whether the propane market is tight or soft — has been on a wild ride so far in 2025. It’s calculated by dividing the price of Mont Belvieu propane (in $/bbl) by the front-month WTI crude futures price at Cushing. Typically, a ratio of 0.5X or higher suggests that propane is relatively expensive. Except for a brief one-day dip in April, the ratio has remained above 0.5X since January. On April 29, it spiked to 0.67X — the highest level since 2021. As shown in the left graph below (green dashed oval), the ratio stood at 0.51X on Friday, May 16.

Over the past ten years, whenever the ratio is at or above 0.5X in May, it has stayed above that level through the end of the year. The right-hand graph illustrates this trend. In high-ratio years (2017, 2018, 2020, 2021), the average holds above 0.5X from May through December. In contrast, in low-ratio years (2015, 2016, 2019, 2022, 2023, 2024), the average stays well below 0.5X during the same period. The blue line shows the current 2025 ratio (blue star) along with the ratio implied by the forward curves for propane and crude. Based on that relationship and the historical ratio, propane is expected to remain relatively expensive compared to crude oil for at least the rest of the year.

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