Your Capacity Plan Assumes a Factory You Don’t Have

The sales head walks into the Monday meeting with good news. A large OEM has agreed to move a second component to you: 1.2 lakh units a month from January. The plant is rated at 1.5 lakh. Production planning checks the number, says it fits, and the deal is signed.

By March, dispatches are averaging 92,000. The plant is running Sundays. Two consignments have gone by air at your cost. The customer’s supplier quality team has started asking about your OTIF numbers, and the conversation in the boardroom has turned to whether you need a second line.

Nobody lied. Everybody planned against a factory you don’t actually have.

You’re planning on nameplate, not reality

Nameplate capacity is what the machines can produce running flat out, on one product, with no stoppages. It is what the vendor quoted and what sits in the project report from when the line was commissioned. It is the only capacity number most mid-market plants have ever written down.

Effective capacity is what the plant reliably produces in a normal month, with your product mix, your people and your suppliers. In most mid-market operations it is somewhere between 55% and 70% of nameplate.

The difference isn’t one big failure. It’s a dozen small ones: changeovers that take 90 minutes instead of 30 because the mix keeps growing, breakdowns that preventive maintenance would have caught, a shift waiting on material that arrived late, absenteeism after every festival, rework on a batch that failed inspection. Each one feels like an exception. Together, they are the operating reality.

Why the gap stays hidden

Nobody measures demonstrated output against a standard. Production reports what was made, not what could have been made. Without the comparison, a 65% month and an 85% month look like two different volumes, not two different levels of performance.

Overtime papers over it. When the plan slips, the plant runs an extra shift or a Sunday. The order ships, the month closes, and the capacity shortfall is recorded as an overtime cost rather than a planning error. The data never says “we can’t do this”.

Sales is paid on bookings. The incentive is to commit. If capacity is someone else’s problem, the nameplate number is the most convenient one available.

Operations doesn’t want to be the department that says no. Plant heads in founder-led businesses learn quickly that “it’s tight but we’ll manage” is better received than “we can’t”. So they manage, at a cost nobody adds up.

What it costs

Start with the visible costs. Overtime is paid at double the ordinary wage rate under the Factories Act. Expedited freight on a ₹50 crore business can quietly run past ₹1 crore a year. Delivery penalties, where contracts carry them, come straight off margin.

The invisible costs are bigger. Customers who see you miss twice start dual-sourcing, and your share of their wallet shrinks before anyone tells you. The plant lives in permanent firefighting, so maintenance gets deferred, which lowers effective capacity further.

And the most expensive mistake: the business decides it needs a new line. ₹8–15 crore of capex to add nameplate capacity, when the existing line is losing a third of its output to fixable causes. You end up with two underperforming lines instead of one good one.

What actually fixes it

Measure demonstrated capacity. Take actual good output over the last 13 weeks, at the actual product mix, and treat that as your planning capacity. It’s an unflattering number. It’s also the true one.

Make mix part of the capacity conversation. Capacity isn’t a single figure. A line that does 1.5 lakh units of one SKU might do 1.1 lakh across eight. Sales needs to know which.

Plan against demonstrated, commit against agreed buffers. Run a monthly sales and operations planning meeting where sales books against demonstrated capacity plus a buffer the plant has signed up to deliver, not against nameplate.

Attack the biggest loss before buying capacity. Break the gap into availability (stoppages), performance (speed losses) and quality (rework and rejection). Usually one dominates. Fixing changeovers or maintenance discipline often recovers 10–15 percentage points, which is a new line’s worth of output without the capex.

Publish the gap. Put nameplate, demonstrated and committed on the same page every month. Once the leadership team can see that the business is promising more than it builds, the conversation changes from “why did we miss” to “what do we fix first”.

Capacity is what you deliver, not what you bought

Your plant’s capacity is not the number on the equipment invoice. It’s what you can reliably produce, at your mix, in an ordinary month. Plan against anything else and the shortfall doesn’t disappear. It just moves onto your overtime bill, your freight costs and, eventually, your customer’s vendor scorecard.

If your plant reports spare capacity but keeps missing dispatches, it’s worth checking which capacity number you’re planning against before it costs you a key account. See how our Operations & Supply Chain practice works →