Count the people who need to talk at the same time, not your total headcount, then add roughly ten to twenty percent as spares. For channels, start with one per group that needs to hold a conversation without interrupting another group. Most single site operations run well on one to four channels, and most first-time buyers under-order on spares and over-order on channels.
Key takeaways
- Size the fleet by concurrent talkers, not by headcount.
- Add ten to twenty percent spares. Radios in chargers and repairs are radios nobody has.
- One channel per group that must not interrupt another group.
- Digital gives you two talk paths per channel, which often removes the need for more frequencies.
- Programme more channels than you use today. Adding them later means reprogramming the fleet.
How many radios do I need?
The instinct is one radio per employee. That is usually both too many and too few: too many because not everyone on the payroll needs to be on the network, and too few because it leaves no allowance for charging, damage and growth.
Step 1: count concurrent talkers
Walk a normal shift and count the roles that genuinely need to communicate while working. A retail store might have four floor staff, one manager and one stockroom. A warehouse might have eight pickers, two forklift operators, one supervisor and one dispatcher. That count, not headcount, is your baseline.
Step 2: allow for shift overlap
If shifts hand over, radios are in use by both the outgoing and incoming teams for a period. Where handovers are long or staggered, size for the overlap rather than for a single shift.
Step 3: add spares
Ten to twenty percent is the working rule, with a practical minimum of one. Spares cover radios in chargers, radios away for repair, damaged units and new starters. Operations that skip spares end up with a supervisor without a radio on the day it matters, which is the most expensive way to save money on a radio order.
Step 4: allow for growth
Buying the exact number you need today means a second, smaller order at a worse price later, possibly against a different model if the line has moved on. Where growth is likely, build it in.
Worked examples
| Operation | Concurrent talkers | Spares | Order |
|---|---|---|---|
| Small retail store | 6 | 1 | 7 |
| Restaurant, front and back of house | 8 | 2 | 10 |
| Mid size warehouse | 12 | 2 | 14 |
| School, admin and site team | 15 | 3 | 18 |
| Security team across a site | 10 | 2 | 12 |
These are starting points, not prescriptions. The count that matters is the one you get from walking your own shift.
How many channels do I need?
A channel is a conversation space. Everyone on a channel hears everyone else on it. You need a separate channel whenever one group's traffic would get in the way of another's.
Start with one channel per operational group that needs to talk without interruption:
- One channel: a small team doing one job together. A shop floor, a small restaurant, a small site crew.
- Two channels: two groups whose traffic does not concern each other. Front of house and kitchen. Picking and dispatch. Housekeeping and front desk.
- Three or four channels: several departments plus a management or emergency channel that stays clear.
- More than four: larger multi department operations, usually with talkgroups rather than physical channels.
Most single site businesses need fewer channels than they initially think. The common error is creating a channel per department on principle, which leaves staff switching channels to find each other and defeats the point of the system.
Keep one channel clear
On any site where safety matters, keep a channel that stays quiet during normal operations so it is available when something goes wrong. A channel that is always busy is not available in an emergency.
Programme more than you use
Programming spare channels at the point of purchase costs nothing. Adding a channel later means bringing every radio in to be reprogrammed. Decide the channel plan with room in it, even if you deploy on one channel.
Digital changes the channel maths
Digital radios divide a channel into two time slots, so two separate conversations run in the channel space analog uses for one. For a licensed business this effectively doubles capacity without applying for more frequencies.
Digital also supports talkgroups, which are logical groups within the system rather than physical channels. A single digital channel can carry several talkgroups, so staff stay on one channel and the system routes who hears what. For operations that would otherwise need many channels, this is usually the better structure. See our guide to digital vs analog radios and the MOTOTRBO digital two-way radios range.
What else to order alongside
- Chargers. Multi unit charging banks for a fleet, rather than individual chargers taking a wall each.
- Spare batteries. Roughly twenty percent of fleet size, so a tired battery is a swap rather than a radio out of service. See battery care and replacement.
- Audio accessories. Earpieces where discretion matters, speaker microphones where the radio sits on a belt, headsets in high noise.
- A repeater, if the site is too large or obstructed for handheld to handheld coverage. See MOTOTRBO SLR repeaters.
Start from your industry
Sizing patterns cluster by environment, so the fastest route to a sensible fleet is to start there: retail, restaurants and hotels, warehouses and distribution, contractors and job sites, schools, security and property management.
Or tell us your headcount, your shift pattern and the departments that need separating, and we will size it with you. Browse business two-way radios to see the range, and see our business radio buying guide for the model decision.
Frequently asked questions
How many two-way radios does my business need?
Count the people who need to talk at the same time during a normal shift, then add ten to twenty percent as spares to cover charging, repairs and new starters.
Do I need a radio for every employee?
Usually not. Only staff who need to communicate while working need a radio. Sizing by headcount typically over-orders while still leaving no spares.
How many spare radios should I keep?
Ten to twenty percent of fleet size, with a practical minimum of one. Spares cover charging, damage and repair turnaround.
How many channels do I need?
One per group that needs to talk without interrupting another group. Most single site operations run well on one to four, plus a channel kept clear for emergencies.
What is the difference between a channel and a talkgroup?
A channel is a physical frequency setting. A talkgroup is a logical group within a digital system. One digital channel can carry several talkgroups, letting staff stay on one channel while the system controls who hears what.
Can I add channels later?
Yes, but every radio has to be reprogrammed. It is far cheaper to programme spare channels when the radios are first configured.
Do digital radios give me more channel capacity?
Effectively yes. Digital divides a channel into two time slots, so two conversations run in the space analog uses for one, without needing extra frequencies.
Should I keep an emergency channel clear?
On any site where safety matters, yes. A channel that carries routine traffic all day will not be available when you need it.