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§ 18

Staffing: pickers for today's orders

How many pickers should we have working tomorrow?

Answer: When the sales department reports how many orders come tomorrow, the shift leader needs to know how many pickers should come. The calculator works out picking hours from number of order lines and your own measured picking speed in lines per hour. Finally air is added for illness and absence so the team also holds on a bad day. The calculator uses only your own figures and suggests no standard time.

Formula

Ordrelinjer = ordrer × linjer pr. ordre

Plukketimer = ordrelinjer ÷ linjer pr. time

Plukkere = plukketimer ÷ effektive timer pr. vagt ÷ (1 − fravær), rundet op til hele personer

Eksempel: 900 × 4 = 3.600 linjer ÷ 90 = 40 timer ÷ 6,5 = 6,2 plukkere ÷ 0,92 = 6,7, altså 7 personer

Symbols and units in the formula
SymbolMeaningUnit
ordrerOrders to be pickedordrer
linjer_pr_ordreOrder lines per order on averagelinjer
linjer_pr_timeLines per hour per picker (your own measurement)linjer/time
timer_pr_vagtEffective picking hours per shifttimer
fravaer_pctAir for absence and illness%
=Pickers needed to comepersoner
=Total picking hourstimer
=Pickers without air for absencepersoner
=Total order lineslinjer

Validity and source

Source
Staffing planning: order lines ÷ measured picking speed

Does not apply when

  • Use a picking speed you have measured for exactly that type of order. Small webshop orders and large shop orders have very different figures. Effective hours are the shift minus breaks, meetings, start-up and tidying up.

Worked example

The calculator's own default values inserted. The figures are calculated with exactly the formula the tool uses.

Substituted

  • Orders to be picked900 ordrer
  • Order lines per order on average4 linjer
  • Lines per hour per picker (your own measurement)90 linjer/time
  • Effective picking hours per shift6.50 timer
  • Air for absence and illness8 %

Giver

  • Pickers needed to come7 personer
  • Total picking hours40.0 timer
  • Pickers without air for absence6.2 personer
  • Total order lines3,600 linjer

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Sådan bruger du den

Du bruger den om eftermiddagen, når ordreprognosen for i morgen kommer, og du skal kalde folk ind eller sende nogen hjem. Den regner plukketimerne og lægger luft til fravær.

Step by step

  1. Hent antal ordrer og gennemsnitligt antal linjer pr. ordre.
  2. Gang de to tal. Det er dagens ordrelinjer.
  3. Del med jeres målte linjer pr. time. Det er plukketimerne.
  4. Del med de effektive timer pr. vagt. Det er plukkere uden luft.
  5. Del med (1 − fravær), og rund op til hele personer.

Typical errors

  • At bruge plukkehastigheden for webshopordrer på butiksordrer. Mål dem hver for sig.
  • At regne med hele vagten som plukketid.
  • At runde ned. 6,2 plukkere er 7 personer, ellers bliver ordrerne ikke færdige.

Examples from everyday life

Webshop før Black Friday

Der er 900 webshopordrer med 4 linjer i gennemsnit. Plukkerne laver 90 linjer i timen, og de har 6,5 effektive timer. I lægger 8 % luft til fravær.

Orders to be picked
900 orders
Order lines per order on average
4 lines
Lines per hour per picker (your own measurement)
90 linjer/time
Effective picking hours per shift
6.5 hours
Air for absence and illness
8 %

It means: Det er 3,600 lines og 40 hours pluk. Uden luft skal der bruges 6.2 people. Med luft til fravær skal 7 people møde.

Butiksruter i en grossist

I morgen skal der plukkes 140 butiksordrer med 38 linjer i gennemsnit. Plukkerne laver 110 linjer i timen med truck og pick-by-voice og har 7 effektive timer. Der er meget influenza, så I lægger 10 % luft til.

Orders to be picked
140 orders
Order lines per order on average
38 lines
Lines per hour per picker (your own measurement)
110 linjer/time
Effective picking hours per shift
7 hours
Air for absence and illness
10 %

It means: Det er 48.4 hours pluk. Uden luft er det 6.9 people, men med fraværet skal 8 people møde.

Rule of thumb

Én plukker med 90 linjer i timen og 6,5 effektive timer klarer ca. 585 linjer på en vagt.

How to check the answer

Plukkere uden luft × effektive timer × linjer pr. time skal give dagens ordrelinjer.