# What size grow tent should I get?

> For a first grow, a 60 × 60 cm (2 × 2 ft) to 90 × 90 cm (3 × 3 ft) tent, 160–180 cm (5.3–6 ft) tall, is the forgiving choice: one to three plants and a 100–320 W LED. A 120 × 120 cm (4 × 4 ft) tent suits two to four plants and 400–650 W. Check your legal plant limit and ceiling first.

- Canonical: https://genetixbay.com/knowledge/answers/what-size-grow-tent.html
- Topic: Equipment · Type: Numbers
- Evidence: Grower practice · Status: Draft: awaiting expert review
- Full article: [Your first grow: a plan from seed to jar](https://genetixbay.com/knowledge/basics/first-grow-guide.md)
- Also asked as: Should I get a 2x4 or 4x4 tent? | What is the best grow tent size for a beginner? | What size grow tent for 2 plants? | How tall should my grow tent be?
- Updated: 2026-10-31 · Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay Knowledge Base (genetixbay.com/knowledge)"

## Short answer

For a first grow, a **60 × 60 cm (2 × 2 ft) to 90 × 90 cm (3 × 3 ft)** tent, **160–180 cm (5.3–6 ft)** tall, is the forgiving choice: one to three plants, a 100–320 W [LED](https://genetixbay.com/knowledge/glossary/led.md) and a small fan. A **120 × 120 cm (4 × 4 ft)** tent [yields](https://genetixbay.com/knowledge/glossary/yield.md) more but costs more to light, cool and run. *Grower practice*. Plant-count limits vary by place, so check your local rules first: they decide the tent.

## Why

Yield indoors scales with lit [canopy area](https://genetixbay.com/knowledge/glossary/canopy.md) and light intensity [1]; light and [planting density](https://genetixbay.com/knowledge/glossary/plant-density.md) were among the main yield factors in a cannabis meta-analysis [2]. A bigger tent only pays if you can light it properly.

Light cost scales with area. A 4 × 4 ft tent has four times the floor of a 2 × 2 and needs roughly four times the light, a bigger fan and more cooling. [Efficacy](https://genetixbay.com/knowledge/glossary/photon-efficacy.md) sets what that costs to run [4].

Bigger pots give bigger plants within reason [3], traded against feeding frequency; 11–19 L (3–5 gal) is the forgiving middle.

Height catches people out. [Photoperiods](https://genetixbay.com/knowledge/glossary/photoperiod.md) commonly [stretch](https://genetixbay.com/knowledge/glossary/stretch.md) 50–150 % after the flip.

## The numbers

| Tent | Plants (pot) | Efficient LED (flower) | [Exhaust fan](https://genetixbay.com/knowledge/glossary/exhaust-fan.md) |
|---|---|---|---|
| 60 × 60 cm (2 × 2 ft) | 1–2 (11 L / 3 gal) | 100–150 W | 100 mm (4 in) |
| 90 × 90 cm (3 × 3 ft) | 2–3 (11–19 L / 3–5 gal) | 225–320 W | 100–125 mm (4–5 in) |
| 60 × 120 cm (2 × 4 ft) | 2 (19 L / 5 gal) | 200–300 W | 100–125 mm (4–5 in) |
| 120 × 120 cm (4 × 4 ft) | 2–4 (19 L / 5 gal) | 400–650 W | 150 mm (6 in) |
| 150 × 150 cm (5 × 5 ft) | 4–6 (19–25 L / 5–7 gal) | 650–1,000 W | 150–200 mm (6–8 in) |

## What to do

1. Check your legal [plant limit](https://genetixbay.com/knowledge/glossary/plant-count-limit.md).
2. Measure floor, ceiling and the nearest outlet; leave 30 cm (12 in) around the tent.
3. Pick the footprint; when unsure, go one size smaller.
4. Pick height: 140–160 cm for [autos](https://genetixbay.com/knowledge/glossary/autoflower.md), 180–200 cm for photoperiods.
5. Size light and fan to the footprint.

## Common mistakes

- Buying the biggest tent that fits.
- Too many plants, too little airflow.
- No headroom for the stretch.
- A big tent with a small light.

## Related

- Full article: [Your first grow](https://genetixbay.com/knowledge/basics/first-grow-guide.md)
- Guide: [Choosing your setup](https://genetixbay.com/knowledge/guides/choosing-your-setup.md)
- [How many plants can I fit in my grow tent?](https://genetixbay.com/knowledge/answers/how-many-plants-per-tent.md)
- [What wattage LED do I need?](https://genetixbay.com/knowledge/answers/what-wattage-light-for-my-tent.md)
- Terms: [tent](https://genetixbay.com/knowledge/glossary/tent.md) · [plant-count limit](https://genetixbay.com/knowledge/glossary/plant-count-limit.md)

## Follow-up questions

**Is a 2x4 or a 4x4 tent better?** A 2 × 4 ft (60 × 120 cm) tent suits two plants in 19 L (5 gal) pots and a 200–300 W LED, and fits narrow spaces. A 4 × 4 ft (120 × 120 cm) tent suits two to four plants and 400–650 W, with roughly twice the canopy and running cost. Choose 4 × 4 if you have the space, power and cooling; 2 × 4 if you don't.

**How tall should a grow tent be?** A grow tent should be tall enough for pot height plus the plant plus a 30–45 cm (12–18 in) light gap plus the fixture and hangers. That is usually 140–160 cm (4.6–5.3 ft) for autoflowers and trained plants and 180–200 cm (6–6.6 ft) for photoperiods, which commonly stretch 50–150 % after the flip. Flip at about half the final height you can fit.

**What size tent for two plants?** Two cannabis plants fit well in a 60 × 120 cm (2 × 4 ft) or 90 × 90 cm (3 × 3 ft) tent in 11–19 L (3–5 gal) pots, with a 200–320 W efficient LED. Two well-trained plants fill a 3 × 3 ft canopy as well as six cramped ones, with better airflow and less mould risk. Check your local plant-count limit before buying.

## Sources

1. Rodriguez-Morrison V, Llewellyn D, Zheng Y. 2021. Cannabis yield, potency, and leaf photosynthesis respond differently to increasing light levels in an indoor environment. Frontiers in Plant Science 12:646020. https://doi.org/10.3389/fpls.2021.646020
2. Backer R, Schwinghamer T, Rosenbaum P, et al., 2019. Closing the yield gap for cannabis: a meta-analysis of factors determining cannabis yield. Frontiers in Plant Science 10:495. https://doi.org/10.3389/fpls.2019.00495
3. Poorter H, Bühler J, van Dusschoten D, Climent J, Postma JA. 2012. Pot size matters: a meta-analysis of the effects of rooting volume on plant growth. Functional Plant Biology 39(11):839-850. https://doi.org/10.1071/FP12049
4. Kusuma P, Pattison PM, Bugbee B, 2020. From physics to fixtures to food: current and potential LED efficacy. Horticulture Research 7:56. https://doi.org/10.1038/s41438-020-0283-7