“Feel the structure” MSA
Here i am attaching a valuable excel sheet for the design of isolated footing with actual surcharge /earth filling weight calculated in the same sheet. Generally, as a designer, we take 10% of total axial load for self weight of footing and filling but when you will actually calculate surcharge/filling weight & self weight of footing, it will be 30% to 40% and in some cases it may even be 50%.
Hence, it is better to calculate self wight of footing and filling weight instead of taking it 10% of total axial load (1.1xP).
From here, download this excel sheet which will automatically take filling and self weight of footing when you put size and thickness of footing.
Thanks & regards!