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Calculating  Insulin  
Total
  Daily
  Insulin
  Requirements:
  
  
Weight
  in
  pounds
  divided
  by
  4
  
  
  OR
  
  
  
  Wt
  in
  kilograms
  multiplied
  by
  0.55
  
  
Ex)
  160lb
  divided
  by
  4
  =
  40
  units
  
  OR
  
  
  
  
  72.7kg
  x
  0.55
  =
  40
  units
  
  
  
  

  
Then
  for
  basal
  bolus
  calculate
  what
  percentage
  you
  want.
  Typically
  40%
  basal
  and
  60%
  bolus.
  
  
Ex)
  40%
  of
  40
  units
  =
  16
  u
  basal
  
  
  
  
  &
  
  
  
  
  60%
  of
  40
  units
  =
  24u
  bolus
  total
  then
  divide
  by
  3=
  8units
  per
  
meal
  (for
  3
  meals
  per
  day)
  
  

  
Calculating
  Insulin
  Sensitivity
  Factor
  (AKA
  Correction
  Factor)
  
  
1500
  divided
  by
  Total
  Daily
  Dose
  of
  insulin
  (TDD)
  if
  patient
  uses
  rapid
  acting
  insulin
  
  
OR
  1800
  divided
  by
  TDD
  if
  patient
  uses
  regular
  insulin
  
  
Ex)
  TDD
  =
  40
  units
  
  
  
  
  so
  
  
  
  1500/40
  =
  37.5
  
  
  
  
  
If
  current
  premeal
  BG
  is
  160
  and
  the
  target
  BG
  is
  90
  you
  would
  take
  the
  current
  BG
  subtract
  the
  target
  
BG
  then
  multiply
  by
  the
  correction
  factor.
  
  
Ex)
  (160-90)/37.5
  =
  1.9
  units
  
  

  
Carb
  to
  Insulin
  Ratio
  
  
This
  is
  the
  number
  of
  grams
  of
  carbohydrates
  that
  is
  covered
  by
  1
  unit
  of
  insulin.
  
  
How
  to
  calculate:
  500
  divided
  by
  TDD
  
  
Ex)
  500/40
  =
  12.5
  grams
  per
  unit
  (I:C
  ratio
  is
  1:12.5)
  
  
So
  if
  90
  gram
  meal
  then
  you
  would
  divide
  90
  by
  12.5
  =
  7.2
  units
  
  
If
  target
  BG
  is
  above
  range
  for
  2-3
  days
  then
  decrease
  C:I
  ratio
  by
  10-20%,
  if
  target
  BG
  is
  below
  range
  for
  
2-3
  days
  then
  increase
  C:I
  ratio
  by
  10-20%.