Something

Menu * {
  Combat Calc:/dialog -mdo combcalc combcalc
}
dialog combcalc {
  title "Combat calc by jenno"
  size -1 -1 238 137
  option dbu
  edit "", 1, 0 62 50 10
  text "Attack", 2, 8 55 25 8
  edit "", 3, 77 94 50 10
  edit "", 4, 0 94 50 10
  edit "", 5, 77 62 50 10
  text "Strength", 6, 91 55 25 8
  text "Defence", 7, 8 87 25 8
  text "Hitpoints", 8, 91 87 25 8
  edit "", 9, 143 76 50 10
  text "Prayer", 10, 156 69 25 8
  edit "", 11, 130 113 104 17
  text "Combat ", 12, 165 106 25 8
  button "Calculate", 13, 87 119 37 12
}

On *:dialog:c:sclick:13: {
  set %attack $calc($did(1)/3)
  set %strength $calc($did(5)/3)
  set %defence $calc($did(4)/4)
  set %hp $calc ($did(4)/4)
  set %prayer $calc($did(9)/8)
  set %combat $calc(%attack+%strength+%defence+%hp+%prayer)
  .msg $chan That = %combat combat