Estimate quantities of concrete from footings

1. DETAIL ESTIMATE USING ITEM RATE-
ESTIMATE
FOOTING-2.1
1.Calculate quantity of concrete?
1. Single footing 2. Stepped footing
Size: 2m x 1m, depth: 0.25m 1st Step size: 2m x 1m, depth: 0.25m
2nd Step size: 1.6 m x 0.6m, depth: 0.20 m
3. Sloped footing 4. Circular footing
Bottom size: 2m x 1m, depth: 0.25m Diameter: 2m, depth: 0.25m
Top size: 1m x 0.5m, depth: 0.3 m

2. Measurement sheet:
Sr.
No.
Work Description Unit No’s Length Width Height
/Depth
Quantity Total
Quantity
1. Concrete work
I. Single footing m3 1 2 1 0.25 0.5 0.5
ii. Stepped footing
1st Step m3 1 2 1 0.25 0.5
0.6922nd Step m3 1 1.6 0.6 0.20 0.192
iii. Circular footing
D = 2 m
R= 1 m
m3 1 ∏ x r2x h = ∏x(1)^2x0.25=0.786m3
iv. Sloped footing
First find the volume of the
rectangular portion by simple
formula
m3 1
2 1 0.25 0.5
0.78
Now for the trapezoidal portion,
use the formula
A=2x1=2m2
a=1.6x0.6=0.93m2
m3 1
= h/3 x ( A + a + √(A x a) )
=0.2/3 x (2+0.93+√(2+0.93))
=0.06 x (2.93 + √2.93)
=0.06 x (2.93 + 1.71)
=0.06 x (4.64) = 0.2784