How Many Cardio Machines Does a Gym Need? Treadmill, Elliptical, and Bike Ratios
A workable planning baseline is one cardio machine per 25–35 members, but that number only holds for a general fitness club with a normal membership profile. The number that actually decides your purchase order is peak-hour demand: how many people are on the floor at 6pm, how many of them want cardio, and how long each machine stays occupied.
For a 500-member general gym, that usually lands at 15–22 cardio machines. For a 500-member strength-focused gym it is closer to 8–12. Same membership count, roughly half the spend.
This guide gives you the arithmetic, the mix ratios and the floor-space check. Those three decide whether your cardio zone gets used or sits empty while members queue for racks.
Why the common benchmarks disagree
You will find three rules of thumb in circulation, and they are measuring different things.
- One piece of equipment per 10 members — this is total equipment, all categories, and it is the most misquoted number in gym planning. It does not mean ten treadmills per hundred members.
- One cardio machine per 25–35 members — a cardio-specific ratio, used by operators trying to keep peak wait times under about five minutes.
- Cardio at 15%–20% of total floor area — a space rule, not a count rule, and it describes what a mature club looks like rather than what to buy.
If you apply all three you will overbuy. The Asian and European clubs we quote for increasingly run cardio at 15%–25% of the equipment budget, down from 35%–40% a decade ago, because strength training demand has grown and cardio utilisation per machine has fallen. Build the count from demand, then check it against the floor.
The four-step method
Step 1 — Peak concurrent users. Take 8%–15% of your membership for a typical club, and 18%–20% for January. If you have turnstile data from a previous site or a competitor benchmark, use it instead of the percentage. A 1,200-member club peaks at roughly 100–170 people on the floor.
Step 2 — Cardio share of peak users. General clubs run 25%–35%. Strength-first and powerlifting-style facilities run 15%–20%. Hotels, apartment gyms and senior living run 60%–90%, because the cardio machines are the only thing most residents use.
Step 3 — Turnover. A machine is not occupied once per hour. Divide 60 by the average session length to get users per machine per hour. A treadmill at 35 minutes serves about 1.7 users an hour, not 3.
Step 4 — Divide. Peak cardio users ÷ users per machine per hour = machines needed. Add 10%–15% for variety and uneven preference, then round to a mix.
Worked example: 1,200 members, 12% peak = 144 people, 30% on cardio = 43 people, treadmill average session 35 minutes = 1.7 users per hour = 25 machines. Round to 24, split across the mix below.
Session length and throughput by machine type
| Machine | Typical session | Users per machine per hour | Notes |
|---|---|---|---|
| Treadmill | 30–40 min | 1.5–2.0 | Highest demand, longest queue |
| Elliptical | 30–35 min | 1.7–2.0 | Lower-impact overflow |
| Upright bike | 30–40 min | 1.5–2.0 | Often underused at peak |
| Recumbent bike | 35–45 min | 1.3–1.7 | Older members, longer sessions |
| Rowing machine | 15–25 min | 2.4–4.0 | Highest turnover, lowest count needed |
| Stair climber | 20–30 min | 2.0–3.0 | Short, hard sessions |
| Air bike | 8–15 min | 4.0–7.0 | Interval use, rarely queued |
Cardio count by facility type
These are planning ranges, not prescriptions. All figures approximate and based on factory-direct projects of similar size.
| Facility | Typical membership | Peak on floor | Cardio share | Cardio machines | Sensible mix |
|---|---|---|---|---|---|
| Personal training studio | 80–200 | 8–20 | 20% | 2–4 | 2 treadmills, 1 bike, 1 rower |
| Boutique / small group studio | 200–400 | 25–50 | 25% | 6–10 | 4–6 treadmills, 2 bikes, 2 rowers |
| Independent gym | 600–1,200 | 60–140 | 30% | 15–28 | 55% treadmill, 20% elliptical, 20% bike, 5% other |
| 24-hour / express club | 1,000–2,500 | 90–250 | 40% | 30–55 | Treadmill-heavy, simple durable models |
| Strength-focused gym | 400–900 | 40–100 | 18% | 8–14 | 4–6 treadmills, 2–4 bikes, 2 rowers, 1–2 air bikes |
| Hotel fitness room | 100–300 rooms | 5–20 | 80% | 3–6 | 2–3 treadmills, 1–2 bikes, 1 elliptical |
| Apartment gym | 150–400 units | 8–25 | 70% | 5–9 | 3 treadmills, 2 bikes, 1 elliptical, 1 rower |
| Senior living | 80–200 residents | 8–18 | 90% | 6–10 | Recumbent bikes and steppers first |
The cardio mix matters more than the count
Twenty treadmills and nothing else is a worse cardio zone than fourteen mixed machines, even though it costs more. Demand concentrates on treadmills, but the members who cannot run (knee issues, older members, beginners, post-rehab) are the ones who churn when the only option is a running belt.
A mix that holds up across most commercial gyms:
- Treadmills: 50%–60% of the cardio fleet. Still the highest-demand machine, still the one that queues.
- Ellipticals and cross-trainers: 15%–20%. The low-impact overflow valve.
- Upright and recumbent bikes: 15%–20%. Recumbent share rises sharply if your membership skews over 45.
- Rowers: 4%–8%. Cheap per unit, high turnover, popular with a small and loyal group.
- Stair climbers: 3%–6%. Expensive, loud, in demand with the high-intensity crowd.
- Air bikes: 2%–5%. Almost never queued, but the CrossFit and conditioning members notice when they are missing.
Two adjustments worth making before you order. If your members are predominantly under 35 and train for aesthetics, shift 5 points from ellipticals to treadmills and air bikes. If your average member is over 45, shift 5 points from treadmills to recumbent bikes and ellipticals. Otherwise the treadmills sit empty while the recumbents queue, which is the most expensive mistake in this category.
Floor space check
Count is only half the answer. Cardio takes more floor per unit than selectorized strength, and the clearances are non-negotiable.
| Machine | Footprint | Practical allocation with clearance |
|---|---|---|
| Treadmill | 30–35 sq ft | 55–70 sq ft including 20–24 in behind |
| Elliptical | 25–30 sq ft | 45–55 sq ft |
| Upright bike | 12–18 sq ft | 28–35 sq ft |
| Recumbent bike | 18–24 sq ft | 35–45 sq ft |
| Rower | 20–25 sq ft | 35–45 sq ft |
| Stair climber | 15–20 sq ft | 35–45 sq ft |
A 24-machine cardio floor at an average 50 sq ft per station needs about 1,200 sq ft, plus circulation. If that is more than 20% of your total floor, you are either overbuying cardio or planning a cardio-led facility on purpose. Both are fine, but know which one you are doing. The layout arithmetic is covered in more detail in the commercial gym floor layout guide.
Where gyms overbuy cardio
Three patterns we see repeatedly in quote requests.
Applying the one-per-ten rule to cardio only. A 1,000-member club reads “one machine per ten members,” orders 100 machines, and fits 40. The rule was about total equipment.
Buying for January. Peak membership in January runs 1.6–2x a normal month. Buying for that peak means six months of half-empty cardio. Buy for the September–November baseline and add 10%–15%, then handle January with session limits.
Copying a hotel gym into a commercial club. Hotels need treadmill-first, simple, quiet machines because guests use them for 20 minutes before dinner. A commercial club with a serious lifting membership needs a very different mix, and copying the hotel list leaves you with bikes nobody rides.
If cardio is genuinely not your members’ priority, spend the money on selectorized strength and plate-loaded machines instead. The planning arithmetic for those zones is in the strength machine count guide and the leg machine count guide.
What to order, and how to order it
Once the count is set, three purchasing decisions shape the total cost more than the model choice.
Standardise on one or two treadmill models. Every additional model is another set of belts, decks, motor brushes and console boards in your spare parts stock. Two models with the same belt width and running surface is the sweet spot for a single-site club.
Order cardio and strength in the same container. Cardio is bulky and relatively light; plate-loaded strength is heavy and compact. Loaded together, the container fills on both weight and volume, and the freight per machine drops. Cardio-only containers almost always cube out before they hit the weight limit.
Buy the first spare parts kit with the machines. Belts, decks, console boards and pedal sets shipped inside the container cost a fraction of what they cost as an air-freight emergency eight months later. What belongs in that kit is covered in the spare parts guide.
FAQ
How many cardio machines do I need for 500 members? For a general gym, 15–22 including treadmills, ellipticals and bikes. For a strength-focused facility, 8–12. The difference comes from the cardio share of peak users, not from the member count.
Should treadmills be more than half the cardio fleet? In most commercial gyms, yes — 50%–60%. Treadmills carry the highest demand and the longest queue. The exception is a membership skewed over 45 or a rehabilitation-heavy facility, where recumbent bikes and ellipticals earn a larger share.
Do I need a stair climber? Only if your membership has a meaningful high-intensity segment. Stair climbers cost roughly two to three times a treadmill, are the loudest machine on the floor, and get used by a narrow group. One or two is usually enough; a row of six is a mistake unless you run classes on them.
Is one cardio machine per 10 members right? No. That benchmark refers to total equipment across all categories. Applied to cardio alone it produces a cardio floor most clubs cannot fill or afford.
How often should cardio machines be replaced? Commercial treadmills typically run 7–10 years with belt and deck replacement at 2–4 years. Bikes and ellipticals last longer because there are fewer wear parts. Plan on replacing 10%–15% of the fleet per year rather than the whole zone at once; the phased cost is easier and the floor stays open.
Get a count and a container plan
Send us your floor plan, membership count and peak-hour estimate. We will come back with a machine count by category, a mix recommendation, and a container loading plan that prices the cardio and strength zones together — factory-direct, with the spare parts kit included in the same quote.
Start with the cardio series: commercial treadmills, ellipticals, spin bikes and rowing machines. Or contact us with your numbers and we will do the arithmetic with you.