Who's Watching the Night Shift? Output per Hour, Night vs Day (₹)
Is your night shift making less per hour than your day shift? As of 17 Oct 2026, the fair test is output per running hour on the same product mix, in standard minutes. In an assumed Haryana two-shift plant where nights run at 80% of the day rate, the gap costs about ₹8.3 lakh of contribution a month.
By the Mama Editorial Team. We scope camera and floor-visibility projects for Indian factories. Last checked: 17 Oct 2026. Every ₹ figure in the worked example is a labelled assumption, including the wage rate.
Key takeaways
- This is about the night shift you already run. Starting a third shift is a separate question: see turning a second or third shift from a compliance cost into revenue.
- Compare like with like. Use standard minutes earned per running hour on the same part numbers. Raw pieces per shift flatter whichever shift got the long, easy runs.
- Most of the gap is time, not effort. Late starts, long breaks, waiting for the electrician and waiting for material usually take more minutes than slower hands do.
- Rotating crews give you a clean test. If the same crew is slower on nights than on days, the cause is night conditions, not the people.
- Price the gap at contribution, not sales. At an assumed ₹40 contribution a piece, each 10 points of night shortfall costs about ₹4.2 lakh a month in this example.
- Cameras show when machines stop and how long a station stands empty. They don't show cycle-time settings, part quality or why someone left the line.
The question behind the question
Most two-shift owners feel the night is weaker, but can't say whether that is the mix, the crew or lost hours.
The day shift has the plant head, planner, stores, tool room and QC on the floor. At night there is often one supervisor for the whole shed.
That is not a judgment on night workers: with thinner support, a stoppage that takes minutes to clear by day can wait far longer at 2 a.m.
The research points the same way. A 2003 review in Occupational Medicine by Folkard and Tucker concluded that "both productivity and safety may be compromised at night" (Folkard & Tucker, 2003, doi:10.1093/occmed/kqg047). The same review found that safety declines over successive night shifts, with longer hours on duty and with longer gaps between rest breaks.
The UK Health and Safety Executive says "the incidence of accidents and injuries has been found to be higher on night shifts" (HSE, human factors: fatigue, checked 17 Oct 2026).
How to compare night and day output fairly
Measure in standard minutes, not pieces
If the night gets one long batch and the day short ones, the night looks better on pieces even when slower. Convert output into standard minutes earned: pieces × standard minutes per piece, summed across part numbers. Garment units already do this with SAM; machine shops can use route-card cycle times.
Compare on the same product mix
The cleanest test is to pick two to five part numbers that both shifts run regularly, and compare only those. If the mix never overlaps, compare standard minutes per running hour instead of pieces.
Separate paid hours from running hours
Output per paid hour mixes two things: how many minutes the line actually ran, and how fast it ran while running. Split them:
- Running minutes ÷ paid minutes shows lost time: late start, breaks, waiting, early stop.
- Standard minutes earned ÷ running minutes shows pace while the machines are running.
This is the availability and performance split from OEE, applied shift by shift. If you want the full method, see OEE explained for Indian factories.
Count good pieces only, and book rejects to the shift that made them
Night output is often inspected next morning, so rejects land on the day shift. Tag every bin with the shift that made it.
Use enough shifts and use the median
Take at least four weeks, around 20 to 24 shifts of each kind, and use the median so one big breakdown doesn't decide the answer. Remove planned events only one shift gets, such as preventive maintenance.
Use crew rotation as a natural experiment
Many Indian plants rotate crews between day and night weekly or fortnightly. If Crew A makes 100 an hour on days and 82 on nights, and Crew B shows the same drop, the gap comes from what the night lacks: support, material, maintenance or supervision. If only one crew drops, look at that crew's leadership and roster. Keep the comparison at crew level, not person level.
The six usual night-shift leaks
Each of these is a time leak you can see and count.
- Late start after handover. The day crew leaves at the bell; the night crew signs in, collects tools, waits for the supervisor and starts 15 to 30 minutes after the shift time.
- Long breaks. The meal break stretches because the canteen is far, the tea vendor comes late, or nobody restarts the line on time.
- One supervisor for the whole floor. When the only supervisor is at the stores or the gate, small stops wait for him to come back.
- Maintenance not on call. The electrician or fitter goes home at 5 p.m. A tripped drive or a broken belt at night waits for a phone call, a scooter ride or the morning.
- Material not staged. Stores close with the day shift. If the next lot of blanks, coils or trims isn't at the line by 8 p.m., the night runs out and waits.
- No one to approve. First-piece approval, a setting change or a die change needs QC or the tool room, and neither is there at night.
Fatigue sits on top of these six: per Folkard and Tucker (2003), safety declines over successive night shifts, so long runs of consecutive nights make every leak worse.
The ₹ example: an assumed Haryana two-shift plant
Assume a 300-person auto-component plant in Haryana running a day shift and a night shift of 8 working hours each, 26 days a month. Each shift has 120 operators on the floor. On the agreed comparison part numbers, the day shift makes 500 good pieces per hour across the floor. The night makes 400, which is 80% of the day rate. Contribution, meaning selling price minus material, power and other variable cost, is an assumed ₹40 a piece.
For wages, assume ₹650 a day for a semi-skilled operator (₹16,900 a month over 26 days; illustrative). Take the current notification for your trade and zone from your state labour department (Haryana Labour Department); most states revise the DA part twice a year.
The example assumes every operator gets exactly that rate, a lower bound.
| Item | Day shift | Night shift |
|---|---|---|
| Good pieces per hour (assumed) | 500 | 400 |
| Good pieces per 8-hour shift | 4,000 | 3,200 |
| Operator wages per shift, 120 × ₹650 (₹) | 78,000 | 78,000 |
| Operator wage cost per good piece (₹) | 19.50 | 24.38 |
| Pieces short vs day, per month (26 nights) | — | 20,800 |
| Contribution lost per month at ₹40/piece (₹ lakh) | — | 8.32 |
| Contribution lost per year (₹ lakh) | — | 99.8 |
The night crew is paid the same wage to make 20% fewer pieces, so each night piece carries 25% more operator wage. The OSH (Central) Rules, 2026 set no separate night-shift wage rate for factory workers (checked 17 Oct 2026), so any night allowance you pay comes on top.
How sensitive is the answer
| Night output as % of day rate | Pieces short per month | Contribution lost per month (₹ lakh) |
|---|---|---|
| 90% | 10,400 | 4.16 |
| 80% | 20,800 | 8.32 |
| 70% | 31,200 | 12.48 |
Same assumptions as above: 500 pieces an hour on days, 8 hours, 26 nights, ₹40 contribution a piece.
Where the 20% might go
A 20% gap on an 8-hour shift equals 96 minutes of day-rate output. Here is one assumed split. Your floor will differ, and finding your own split is the point of the exercise.
| Leak (assumed) | Minutes lost per night | Share of gap (rounded) |
|---|---|---|
| Late start after handover | 20 | 21% |
| Meal and tea breaks overrunning | 15 | 16% |
| Early wind-down before shift end | 15 | 16% |
| Breakdowns waiting for maintenance | 25 | 26% |
| Waiting for material or approval | 15 | 16% |
| Slower pace while running | 6 | 6% |
| Total | 96 | 100% |
In this split, 90 of the 96 minutes are lost time and only 6 are pace. That changes the fix: an electrician on call and material staged by 8 p.m. recover more output than any talk to the crew about working harder.
What fixes usually look like
Once you know the biggest leak, the fixes are ordinary management:
- Handover at the machine, not at the gate. Overlap the shifts by 10 to 15 minutes so the line never stops at the change.
- Stage the night's material before stores close. A simple rule: the night's first two lots are at the line before the day shift leaves.
- Put one maintenance person on nights, or a call roster with a response time. Compare the cost of that person with the breakdown minutes in your split.
- Limit consecutive nights. The research on successive night shifts supports shorter night blocks and planned breaks (Folkard & Tucker, 2003).
If you are deciding whether the night shift is worth running at all, the third-shift payback calculator does that arithmetic on your own numbers.
Night work and the law, as context
The OSH Code, 2020 took effect on 21 November 2025 (PIB, 21 Nov 2025). Section 43 lets women work before 6 a.m. and after 7 p.m. with their consent, subject to conditions the appropriate government prescribes (OSH Code, 2020, Gazette of India).
Rule 83 of the OSH (Central) Rules, 2026, notified 8 May 2026 for central-sphere establishments, lists those conditions: written consent, pick-up and drop transport, well-lit passages, closed-circuit television surveillance on the way to toilets and other facilities, displayed emergency numbers and POSH Act compliance (G.S.R. 345(E), Gazette of India).
For a private factory, the state government makes the working rules, so check your state's rules and notifications, which may add more conditions. Our guide to running women on the night shift and the CCTV the 2026 rules expect covers the details. The women night shift cost and output calculator puts transport, security and allowance against the extra output.
What cameras can and can't tell you about the night shift
Cameras answer the time questions well. They show when each machine started after handover, how long it stood during the break, when a breakdown began and when someone arrived to fix it. They also show whether material sat at the line and when the last machine stopped before the bell.
Cameras can count staffed stations as an aggregate, which is enough to compare nights with days without looking at any one person.
Cameras can't read the cycle-time setting inside a machine, so slow pace while running is better taken from the controller or a stroke counter. They can't see part quality, so rejects still need QC. They can't tell you why a station was empty: a worker sent to fetch material looks the same as one on a long break.
Under infrared at night most cameras switch to black and white: fine for "running or stopped", weak for colour-coded tags.
Footage of recognisable workers is personal data under s.2(t) of the DPDP Act, 2023; tell workers in writing what is recorded and why (see the worker CCTV notice under DPDP).
Where Mama fits
Mama reads the cameras a factory already has and, every morning, sends the owner a short plain-language note on where hours were lost the day and night before. That includes late starts, long stops and machines waiting, shift by shift. It watches machines and flows and reports people only as aggregate counts, never by name. To see what that would look like for your night shift, leave an email or phone in the form below.
FAQ
What is a normal night shift output compared with the day shift?
No single benchmark fits every plant; Folkard and Tucker's 2003 review says only that productivity "may be compromised at night" (doi:10.1093/occmed/kqg047). The useful number is your own gap, measured in standard minutes per running hour on the same part numbers over four weeks.
Should I compare pieces per shift or output per hour?
Use output per hour, split into running minutes per paid minute and standard minutes per running minute. Pieces per shift reward whichever shift got the long, easy runs.
Is it fair to blame the night crew for lower output?
Usually not. If crews rotate and every crew drops on nights, the cause is what the night lacks: maintenance cover, staged material, approvals or supervision.
Do I have to pay a night-shift allowance in India?
The OSH (Central) Rules, 2026 set no separate night-shift wage rate for factory workers (checked 17 Oct 2026). Check your own state's wage notification and rules, your settlement with the union and any contract terms.