Capacity Planning: How Many Customers Can You Serve?

Operations: Deliver and run the business

Our time is our life.

It is also your capacity. Every business has a ceiling on how much work it can do well in a week, and many owners have never written that number down. They find it out the hard way, when the phone keeps ringing and quality starts to slip.

Keep two words apart. Demand is how many customers want you. Capacity is how many you can serve properly. Marketing raises demand. It does nothing for capacity. If you only work on the first, you can grow yourself into a mess.

The arithmetic, one line at a time

Use your own numbers, but here is a labelled example so you can see the steps. Say you run a small cleaning company with one two-person crew that works together on every job. The crew is available 40 hours a week, and a job takes the crew four hours. If your people work separately, count each person’s hours instead. All figures here are illustrations, not benchmarks.

• Hours the crew is available in a week: 40.
• Hours lost to driving, supplies and admin: 8.
• Productive hours: 40 − 8 = 32.
• Time one typical job takes: 4 hours.
• Jobs at full stretch: 32 ÷ 4 = 8 jobs a week.
• Buffer for emergencies, sick days and running late: 20 percent, so 8 × 0.8 = 6.4, which I round down to 6 jobs a week.

Six jobs a week is your working capacity, not eight. The buffer is what lets you keep your promise when the unexpected happens, and something unexpected always happens.

Now put demand next to it. Say ten inquiries arrive in a week and three out of ten become customers: that is 3 jobs, well under your 6. You have room. If a campaign lifts that to thirty inquiries and the same three in ten close, that is 9 jobs against a capacity of 6. The gap is 3 jobs a week, and the crew cannot fill it without cutting corners, cancelling, or running late.

Change the labels to your trade. A restaurant counts seats and turns. A consultant counts billable hours. A landscaper counts crew-days. The steps are the same: available time, minus what disappears, divided by the time each unit takes, minus a buffer.

What to do with the number

Once you know the ceiling, you can make three real choices. You can raise it, by adding hours, people or better tools. You can raise what each job earns, so the same six jobs bring in more, which is a pricing conversation. Or you can steer your marketing to match, adding when there is room and easing off when there is not.

That last one deserves its own lesson, and it has one: Marketing When You Are Already Full. The short version is that being full is not a reason to stop thinking about marketing, but it does change what the marketing is for.

Also notice what happens near the ceiling. When a business runs at eight jobs on a six-job capacity, it does not fail loudly. Reviews get slightly worse. Callbacks take longer. The best employee starts to look tired. By the time you see it in the numbers, customers have already told their friends.

One more honest point. The owner is usually part of the capacity, and the owner is usually the least measured part. If you quote, sell, order supplies, answer messages and also work on the jobs, your own hours belong in the arithmetic too. A crew that can do six jobs is no use if the person who books, prices and invoices them runs out of evenings first.

This week

Write your own version of the six lines above on a single sheet. Use a real week from the last month to check your time per job, because it is almost always longer than you think. Then compare your capacity to your average weekly demand and write down the gap, in either direction.

It takes an hour or two for the first calculation, longer if you have to track your actual job times for a week or two to get an honest number. It is free. Revisit it whenever you add a person, change your services, or notice you are running late more often.

If your phone rang twice as often tomorrow, what would break first?