diff --git a/plugins/pert/README.md b/plugins/pert/README.md
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+++ b/plugins/pert/README.md
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+### PERT Calculator
+
+A simple utility to estimate tasks using PERT (Program evaluation and review technique)
+
+### Usage
+
+A command line PERT calculator for quick estimates.
+
+Comma separated task list in the form "1,2,12 4,5,9 2,3,6", where whitespace separates tasks.
+
+Usage:
+ pert [optimistic,realistic,pessimistic]
+
+Example:
+ pert 1,3,4
+ pert 10,15,20 5,7,10
+ pert "1,2,3" "15,17,20"
+
+
+### Example
+
+Command:
+
+`$ pert 5,7,10 2,3,4 10,12,14`
+
+Output:
+
+Tasks
+
+ +--------------------------------------------------------------------------------------+
+ | # | optimistic | realistic | pessimistic | duration | risk | variance |
+ +--------------------------------------------------------------------------------------+
+ | 1. task | 5 | 7 | 10 | 7.16 | 0.83 | 0.68 |
+ | 2. task | 2 | 3 | 4 | 3.00 | 0.33 | 0.10 |
+ | 3. task | 10 | 12 | 14 | 12.00 | 0.66 | 0.43 |
+ +--------------------------------------------------------------------------------------+
+ | summary | - | - | - | 22.16 | 1.82 | 1.21 |
+ +--------------------------------------------------------------------------------------+
+
+Three point estimates
+
+ +----------------------------------------+
+ | confidence | | |
+ +----------------------------------------+
+ | 1 Sigma - 68% | 20.34 | 23.98 |
+ | 2 Sigma - 95% | 18.52 | 25.80 |
+ | 3 Sigma - 99% | 16.70 | 27.62 |
+ +----------------------------------------+
+
+
+### License
+[MIT](https://github.com/arzzen/pert/blob/master/LICENSE)
+
+### Maintainer
+[Lukas Mestan](https://github.com/arzzen/)
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diff --git a/plugins/pert/pert.plugin.zsh b/plugins/pert/pert.plugin.zsh
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+#
+# A simple utility to estimate tasks using PERT
+# (Program evaluation and review technique)
+#
+
+alias pert="pert.sh"
+
+# helper cli calculator
+_calc() {
+ echo "scale=2; $@" | bc -l | sed 's/^\./0./'
+ return 0
+}
+
+# divider row
+_divider() {
+ divider=------------------------------
+ divider=" +"$divider$divider$divider"+"
+ printf "%$_width.${_width}s+\n" "$divider"
+ return 0
+}
+
+# show help for command list
+_help() {
+ print -P ""
+ print -P "A command line PERT calculator for quick estimates."
+ print -P ""
+ print -P "Comma separated task list in the form \"1,2,12 4,5,9 2,3,6\","
+ print -P "where whitespace separates tasks."
+ print -P ""
+ print -P "Usage:"
+ print -P ""
+ print -P " pert [optimistic,realistic,pessimistic]"
+ print -P ""
+ print -P "Example:"
+ print -P ""
+ print -P " pert 1,3,4"
+ print -P " pert 10,15,20 5,7,10"
+ print -P " pert \"1,2,3\" \"15,17,20\""
+ print -P ""
+ return 0
+}
+
+# header row
+_table_header() {
+ print -P ""
+ print -P "Tasks"
+ print -P ""
+ _width=88
+ _divider
+ printf "$format" "#" "optimistic" "realistic" "pessimistic" "duration" "risk" "variance"
+ _divider
+ return 0
+}
+
+# footer summary row
+_table_footer_sum() {
+ printf "$format" "summary" "-" "-" "-" $total_estimate $total_standard_deviation $total_variance
+ _divider
+ return 0
+}
+
+# footer 3point row
+_table_footer_tpe() {
+ print -P ""
+ print -P "Three point estimates"
+ print -P ""
+
+ _width=42
+ tpeformat=" | %-13s |%11s |%10s |\n"
+
+ _divider
+ printf "$tpeformat" "confidence"
+ _divider
+ printf "$tpeformat" "1 Sigma - 68%" $(_calc "$total_estimate - $total_standard_deviation") $(_calc "$total_estimate + $total_standard_deviation")
+ printf "$tpeformat" "2 Sigma - 95%" $(_calc "$total_estimate - 2 * $total_standard_deviation") $(_calc "$total_estimate + 2 * $total_standard_deviation")
+ printf "$tpeformat" "3 Sigma - 99%" $(_calc "$total_estimate - 3 * $total_standard_deviation") $(_calc "$total_estimate + 3 * $total_standard_deviation")
+ _divider
+ return 0
+}
+
+# main function
+pert() {
+
+ # help text
+ if [ -z "$1" ] || [[ "$1" =~ [-]*(help|h) ]]; then
+ _help
+ return 1
+ fi
+
+ format=" | %-12s |%11s |%10s |%12s |%9s |%9s |%9s |\n"
+
+ # header
+ _table_header
+
+ counter=0
+ total_estimate=0
+ total_standard_deviation=0
+ total_variance=0
+ for var in "$@"; do
+ # counter iterator
+ counter=$[$counter +1]
+
+ # optimistic value
+ o=${var[(ws:,:)1]}
+
+ # realistic value
+ r=${var[(ws:,:)2]}
+
+ # pessimistic value
+ p=${var[(ws:,:)3]}
+
+ # check values
+ if [ -z "$o" ] || [ -z "$r" ] || [ -z "$p" ]; then
+ printf "$format" "$counter. bad input" $o $r $p
+ else
+ # pert estimate
+ pert_estimate=$(_calc "($o+4*$r+$p)/6")
+ total_estimate=$(_calc "$total_estimate + $pert_estimate")
+
+ # standard deviation
+ standard_deviation=$(_calc "($p-$o)/6")
+ total_standard_deviation=$(_calc "$total_standard_deviation + $standard_deviation")
+
+ # variance
+ variance=$(_calc "$standard_deviation * $standard_deviation")
+ total_variance=$(_calc "$total_variance + $variance")
+
+ # table row
+ printf "$format" "$counter. task" $o $r $p $pert_estimate $standard_deviation $variance
+ fi
+ done
+
+ _divider
+
+ # footer
+ if [[ $total_estimate > 0 ]]; then
+ _table_footer_sum
+ _table_footer_tpe
+ fi
+
+ print -P ""
+ return 0
+}
+
+unset _width
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