The lifting capacity of the crane can be 5t, 10t, 15t/3t, 20t/5t, 30t/5t, 50t/10t, 75t/20t, 100t/20t, 125t/20t, 150t/30t, 200t/30t, 250t/30t, etc. When calculating the crane capacity, you need to consider the following things: The weight of the load to be lifted. Below-the-hook lifting devices you may need.