You can use Newton's equations for gravity to calculate this. https://www.quora.com/What-is-the-acceleration-due-to-gravity-of-earth-as-a-function-of-radial-di

You can use Newton's equations for gravity to calculate this. https://www.quora.com/What-is-the-acceleration-due-to-gravity-of-earth-as-a-function-of-radial-distance-g-r https://www.quora.com/What-is-the-acceleration-due-to-gravit... At the ISS, the extra distance from the center of the earth is minimal compared to the radius of the earth itself. Therefore, there wouldn't be a great difference.