What it means
A shop earns $24,000 in sales during a day when staff work a combined 80 hours, so sales per labour hour is $300, which helps managers see how staffing and sales moved together. Shopify describes SPLH as revenue divided by total labour hours worked, and its usefulness depends on consistent sales and time records.
Define the sales measure, since gross receipts, net sales after returns and recognised revenue can differ, and define labour hours, including all relevant employees on the floor or in the operation and not only cashiers, with a decision on how managers, trainees and overtime are counted. Match the time window, because a day of sales divided by a week of hours is meaningless, and check site boundaries so that sales at one location are divided by hours supporting that location.
Consider hours before opening, as preparation, cleaning and stock work support sales even when the register is closed and excluding them flatters the ratio, and reconcile paid hours and clocked hours to payroll when relevant. Look at demand, because a quiet Tuesday may have lower SPLH than Saturday despite good service, so compare comparable days and periods, and watch returns and product mix, since a large return can reduce net sales in one shift and a large-ticket purchase can create a one-day spike.
Use forecasts for scheduling but leave enough flexibility to protect service, and do not cut blindly, because too few employees can increase queues, errors and lost sales and a short-term ratio improvement may damage future revenue. Check wage rates, as two shifts with the same SPLH can have different labour cost if pay rates or overtime differ, and review margin, since high sales of low-margin goods may not support staffing as well as lower sales with better margin.
Measure service quality alongside efficiency, because customer wait time, complaints and repeat visits may deteriorate if staff are overloaded, and avoid individual blame, since many staff contribute to a sale. Segment by activity, as a restaurant kitchen and dining room have different workflows, and consider new stores, where opening periods may have extra training hours and uncertain demand, comparing against ramp plans rather than mature-site targets.
Track overtime, because a high SPLH may mask exhausted staff or expensive overtime. Explain targets, since a fixed company-wide benchmark may not fit different store sizes or service models, and use rolling views so weekly and monthly trends smooth one-off events while the latest shift detail stays available.
If SPLH rises after schedule changes, test whether margins and customer service also improved, because correlation is not proof of cause. For owners, SPLH is a quick operational lens that supports better scheduling when read with labour cost, margin and customer outcomes, and a sustainable target should leave time for cleaning, stock replenishment, training and other work that does not appear directly in a sale.
In practice
Real-world examples.
Example
A store makes $24,000 of net sales over 80 worked hours, or $300 per hour. The manager records the figure for that day alongside the weather and any promotion. Next week's schedule is compared with the same weekday, not with a weekend.
Example
A restaurant compares busy lunch shifts with similar days, not a quiet morning. The kitchen and dining room hours are shown separately as well as combined. The owner sees where extra staff added sales and where they only added cost.
Example
A shop checks whether a higher SPLH after staff cuts also increased waiting time. Customer waits during the late rush have grown, and complaints have risen. The manager decides the ratio improved at the expense of service.
Formula
Calculation
Sales per labour hour = eligible sales / total relevant hours worked. Define sales and hours consistently.
Worked example: a store makes $24,000 of net sales over 80 worked hours, so SPLH is $24,000 / 80 = $300 per hour. On a busy Saturday it makes $36,000 over 100 hours, or $360 per hour, and on a quiet Tuesday $9,000 over 50 hours, or $180 per hour, so the Tuesday figure should be compared with other Tuesdays. Add labour cost for context: at an average wage of $20 an hour, the 80 hours cost $1,600, which is $1,600 / $24,000 = 6.7% of sales.Case study
Seen in the real world.
Entirely fictional case: Fern Cafe sees low SPLH on weekday afternoons and reduces one shift. The ratio rises, but customer complaints also increase during a late rush. Fern restores flexible coverage and compares sales, wages and service quality. It uses the metric to guide staffing, not to minimise hours at any cost.
Watch out
Common mistakes.
- Counting only cashier hours while excluding other staff who support sales.
- Using high SPLH as proof of profit without checking margin or wages.
- Cutting staffing until queues and lost sales rise.
Questions
People also ask.
What is sales per labour hour?
Sales in a period divided by total relevant staff hours worked in that period.
Why track it?
It can help align staffing with demand and compare similar shifts or locations.
Does it show the full picture of labour performance?
No. It omits margins, wage rates, service quality and teamwork.
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