The original version of this paper was published here in May 2009: See S-curve/intro.htm This 4th Edition was submitted for publication in January 2019. It is copyright © Midori Media. Published here September 2019.

## Generating Percentage S-curves

Percentage S-curves may be generated by dividing the Year To Date (YTD) daily totals for each Day for each S‑curve (Baseline, Actual, Target) by either the total Baseline Man Hours (Baseline = 100%) or Target Man Hours (Target = 100%).

### Generating Percentage S-curves (Baseline = 100%)

To generate Percentage S-curves with the Baseline = 100%, divide the Year To Date (YTD) daily totals for each S‑curve by the Baseline total Man Hours for each Day of the Project.

• Baseline YTD % = Baseline YTD Total / Baseline Total Man Hours x 100%
• Actual YTD % = Actual YTD Total / Baseline Total Man Hours x 100%
• Target YTD % = Target YTD Total / Baseline Total Man Hours x 100%

The calculations for each S-curve are shown below.

 100% Baseline 01‑Feb-2016 02‑Feb-2016 03‑Feb-2016 04‑Feb-2016 05‑Feb-2016 06‑Feb-2016 07‑Feb-2016 Baseline YTD 6.0 20.0 43.0 78.0 90.0 -- -- Baseline YTD % 6.67% 22.22% 47.78% 86.67% 100.00% -- -- Actual YTD -- 9.0 18.0 38.0 -- -- -- Actual YTD % -- 10.00% 20.00% 42.22% -- -- -- Target YTD -- 14.5 29.0 48.5 73.0 90.0 95.0 Target YTD % -- 16.11% 32.22% 53.89% 81.11% 100.00% 105.56%
##### Table 10: Calculation of Percentage S‑curves, Baseline = 100%

The resulting S-curves are shown in Figure 18.

### Generating Percentage S-curves (Target = 100%)

To generate Percentage S‑curves with the Target = 100%, divide the Year To Date (YTD) daily totals for each S‑curve by the Target total Man Hours for each Day of the Project.

• Baseline YTD % = Baseline YTD Total / Target Total Man Hours x 100%
• Actual YTD % = Actual YTD Total / Target Total Man Hours x 100%
• Target YTD % = Target YTD Total / Target Total Man Hours x 100%

The calculations for each S-curve are shown in Table 11.

 100% Target 01‑Feb-2016 02‑Feb-2016 03‑Feb-2016 04‑Feb-2016 05‑Feb-2016 06‑Feb-2016 07‑Feb-2016 Baseline YTD 6.0 20.0 43.0 78.0 90.0 -- -- Baseline YTD % 6.32% 21.05% 45.26% 82.11% 94.74% -- -- Actual YTD -- 9.0 18.0 38.0 -- -- -- Actual YTD % -- 9.47% 18.95% 40.00% -- -- -- Target YTD -- 14.5 29.0 48.5 73.0 90.0 95.0 Target YTD % -- 15.26% 30.53% 51.05% 76.84% 94.74% 100.00%
##### Table 11: Calculation of Percentage S-curves, Target = 100%

The resulting S-curves are shown in Figure 19.