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https://pilotworkshop.com/tips/quick-crosswind-estimate/

• If the wind differs from the runway heading by 15 degrees, the crosswind component is roughly one-quarter or 25% of the wind velocity. Divide the reported wind speed by four to estimate the crosswind component.
• If the difference between the wind and runway heading is 30 degrees, the crosswind is half of the reported wind speed.
• If the wind makes a 45-degree angle with the runway, the crosswind component is three-quarters or 75% of the overall wind speed.
• When the windsock is pointing 60 degrees or more from the runway centerline, assume the crosswind component is the same as the reported wind speed.