I indicated that the Earthing Systems Design Steps process has (3) main steps:
Earthing Systems Design
Steps

And I explained the first step: Data Collection in the following Articles:
I explained the second step: Data Analysis in the following Articles:
And I explained What we are going to design for grounding system in any building in the following Articles:
And, in Article " Grounding Design Calculations – Part One ", I indicated the following:
Grounding System Design
Calculations according to type of the building
The procedures for performing the Grounding System Design
Calculations can differ slightly according to the type of the building
as follows:

First: Domestic,
commercial and industrial premises
We mean by domestic, commercial and
industrial premises, all installations up to 1,000 V ac and 1,500 V dc 
between phases, with some minor exceptions.

And I started discussion for Methods of Grounding Design Calculations of Domestic, commercial and industrial premises as follows:
Methods of Grounding Design
Calculations
There are many methods can be used for
performing Grounding System Design Calculations But the common methods
are:

In this Article and Article " Grounding Design Calculations – Part Two ", I explained the first method of grounding design calculations: Equations Method and solved examples.
And I explained the second method of grounding design calculations: Nomographs Method in Article " Grounding Design Calculations – Part Three".
Also, I explained the third method of grounding design calculations: Excel Spreadsheets Method in Article " Grounding Design Calculations – Part Four ".
And I explained the forth method of grounding design calculations: By using Tables In Articles " Grounding Design Calculations – Part Five " and " Grounding Design Calculations – Part Six ".
Today, I will continue explaining the fifth method of grounding design calculations: Online Earthing Calculators Method.
You can preview the following Articles for more info:
Fifth Method: Online
Earthing Calculators Method  Continued

In Article " Grounding Design Calculations – Part Seven ", I listed the online Earthing calculators that will be introduced and explained help electrical designers in grounding design calculations.
Also, I explained the first online earthing calculator: LPI Earthing Calculator in this article and we are going to explain other online earthing calculators which are listed as follows:
In the next Article, I will explain the Sixth Method of Grounding Design Calculations: Software Programs Method. Please, keep following.
Online Earthing
Calculators Method
In
this method, I will introduce some good online earthing calculators that can
help electrical designers in grounding design calculations. I choose the
following (3) online earthing calculators providers:
These (3)
earthing calculators providers provide (6) online earthing calculators that
will be explained herein.

Important
Before
using any online earthing calculator, you must check its compatibility with
your local codes and standards.

Second: Loresco Earthing
Calculators
Loresco
international company introduces (3) Loresco calculators as follows:

Method Of
Using This Calculator
1 Choose Metric or English units by use of
the input unit select button (beside the calculate button) prior to entering
variables. The English units are feet and inch while the Metric units are
meter and cm.
Note:
2 Enter the average
resistivity of the environment (earth) around the grounding electrode in
ohmcm.This is the value of soil
resistivity determined though field testing.
Notes:
3 Enter the length of a
single grounding electrode or electrode column in meters or feet.
Notes:
4Enter the total number
of electrode holes installed.
This is the number of LORESCO
grounding backfill columns. Regardless of the number of electrodes installed
in a single hole or grounding backfill column, this is considered one
electrode.
5 Enter the diameter of
a single electrode or electrode column in centimeters or inches.
Again, this is the
diameter the LORESCO grounding backfill, if used, or the actual electrode
diameter, if no backfill is used.
6 Enter the
centertocenter spacing between individual electrode holes or columns in
meters or feet.
Notes:
7 Select one of the two
choices from the dropdown menu (Deep or shallow).
Surface electrodes
generally are installed with the top of the active electrodes within 15 meters
(50 feet) from the surface. Deep electrodes are generally installed with the
top of the active electrode below 15 meters (50 feet) from the surface.
8 Result: click on
the Calculate button, You will get the resistancetoearth in ohms of the
electrode system described by the input data.
Notes:

2
Loresco Horizontal Resistance Calculator

Method
Of Using This Calculator
1 Choose Metric or English units by use of
the input unit select button (beside the calculate button) prior to entering
variables. The English units are feet and inch while the Metric units are
meter and cm.
Note:
2 Enter the average
resistivity of the environment (earth) around the grounding electrode in
ohmcm.This is the value of soil
resistivity determined though field testing.
Notes:
3 Enter the length of
the grounding electrode in meters or feet.
Note:
4 Enter the depth
from the surface of the earth to the center of the horizontal grounding
electrode in meters or feet.
5 If the electrode
shape is cylindrical, enter the diameter of the electrode or electrode
backfill column in centimeters or inches. This is the diameter of the LORESCO
carbon backfill column, if used. If no backfill is used, this is the diameter
of the electrode itself.
If the electrode shape is
rectangular, enter the width of the electrode or electrode backfill column in
centimeters or inches. This is the width of the LORESCO carbon backfill
column, if used. If no backfill is used, this is the width of the electrode
itself.
6 If the electrode shape
is rectangular, enter the thickness of the electrode or electrode backfill
column in centimeters or inches. This is the thickness of the LORESCO carbon
backfill column, if used. If no backfill is used, this is the thickness of
the electrode itself.
If the electrode shape is
cylindrical, no thickness should be entered. If a thickness is entered, it is
ignored by the calculations.
7 Choose one of the
two horizontal electrode shapes from the dropdown menu. This refers to the
crosssectional shape of the LORESCO grounding backfill column, if used. If
grounding backfill is not used, this is the cross sectional shape of the
grounding electrode itself.
8 Result: click on
the Calculate button, you will get the resistancetoearth in ohms of the
electrode system described by the input data.
Notes:

3
Loresco Grid Resistance Calculator

Method
Of Using This Calculator
1 Choose Metric or English units by use of
the input unit select button (beside the calculate button) prior to entering
variables. The English units are feet and inch while the Metric units are
meter and cm.
Note:
2 Enter the total length of the grid
conductors in meters or feet.
3 Enter the average length of the ground
rods or the grounding backfill columns, if used, in meters or feet. If a
grounding backfill column is used, you should enter the total length of the
backfill regardless of the length of the ground rod or contacting electrode
within the backfill.
4 Enter the average resistivity of the upper layer of soil around the
grounding grid in ohmcm. This is the value of soil resistivity from the
surface to a depth of H as determined though fieldtesting.
5 Enter the average
resistivity of the deeper layer of soil around the grounding electrode in
ohmcm. This is the value of soil resistivity from the depth of H downward as
determined though fieldtesting.
Note:
6 Enter the diameter of the
grid conductors in centimeters or inches. If Loresco grounding enhancement
backfills are used around the grid conductors, enter the equivalent diameter
of the backfill.
7 Enter the diameter of a single
ground rod or of a backfill column, if used, in centimeters or inches. Again,
this is the diameter the LORESCO grounding backfill, if used, or the actual
electrode diameter, if no backfill is used.
8 Enter the total number of ground
rods installed. If Loresco grounding backfill columns are used, enter the
number of backfill columns. Regardless of the number or type of electrodes
installed in a single hole or grounding backfill column, this is considered
one rod.
If neither ground rods nor
grounding backfill columns are to be installed, enter zero for this value.
The calculator will then estimate the resistance of the grid without ground
rods.
9 Enter the depth of burial of
the grid in meters or feet. If the grid is laying on the surface of the
earth, you may enter zero.
10 Enter the thickness of the
upper soil layer in meters or feet. If the soil resistivity is uniform to a
depth equal to or greater than the average rod length, a single soil
resistivity layer model is used. In this case, you must enter the value of
the upper soil resistivity for both the upper and lower resistivity values
required and enter any number for the Thickness of the Upper Layer, H. In
order for the two layer model to be valid, the thickness of the upper layer
should be at least 10% of the longside grid length.
Finally, the thickness of the
upper layer, H, must be greater than or equal to the grid depth and less than
or equal to the average ground rod length.
11 Enter the length of the short side
of the rectangular area covered by the grid.
12 Enter the length of the long side of
the rectangular area covered by the grid.
13 Result: click on the Calculate button, you
will get the resistancetoearth in ohms of the electrode system described by
the input data.
Notes:

Third: Electrician2 Grounding Calculators
Electrician2
website introduce two user friendly Grounding Calculators as follows:

1 Grounding Electrode Conductor Size Calculator
This program reads NEC Table 250.66. Select the size of
largest copper service entrance conductor or equivalent area for parallel
conductors from the list or select size of largest aluminum service entrance conductor
or equivalent area for parallel conductors from the list and this program
finds the sizes of either the copper or aluminum equipment grounding
electrode conductors.

2 Equipment Grounding Conductor Size Calculator
This program reads NEC Table 250.122. Select the
overcurrent protective device from the list that includes the standard
overcurrent protective device sizes from Section 240.6(A) and this program
finds the sizes of both the copper and aluminum equipment grounding
conductors.

You can use the Electrician2 Grounding Calculators by click on the
link.

In the next Article, I will explain the Sixth Method of Grounding Design Calculations: Software Programs Method. Please, keep following.
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