What is the ratio when cake flour is replaced with High-ratio flour when baking a sponge cake?

When substituting high-ratio flour for cake flour in a sponge cake recipe, use a 1:1 ratio. However, high-ratio flour contains more protein and can absorb more liquid, so you may need to slightly adjust the liquid ingredients or the fat content to achieve the desired batter consistency. Additionally, keep an eye on the baking time, as it may vary slightly with the different flour.