Space most tomato plants 18 to 36 inches apart in rows 3 to 4 feet apart. Staked plants sit closest at about 18 inches, caged plants need 24 to 30 inches, and sprawling plants need 36 inches or more. Pick your variety and support below to get exact spacing, and enter bed size to see how many plants fit.
Try a preset:
Your entries stay in your browser. Nothing is sent to a server or saved to an account.
What your result means: the in-row number is how far apart to set plants along a row; the row number is the gap between rows. If you enter a bed size, the tool also shows how many plants fit. Use the in-row inches in the Trellis Calculator to size your support.
How do you use the spacing calculator?
Choose your variety type and support method to get the recommended spacing. Enter a bed length and width to also see how many plants fit; leave them at zero to skip capacity.
- Pick your variety type, since bushy determinates need less room than vining indeterminates.
- Pick your support method, because staking lets plants sit closer than caging or sprawling.
- Enter bed size (optional), then press calculate for spacing and plant capacity.
What each result means
| Result | What it tells you |
|---|---|
| In-row spacing | How far apart to set plants along a single row |
| Row spacing | The gap to leave between rows for airflow and access |
| Per-plant footprint | Square feet each plant occupies, useful for planning |
| Plants that fit | How many plants your bed holds at this spacing |
Tomato spacing chart
These are the spacing ranges the calculator uses, based on how each variety and support method grows.
| Variety and support | In-row spacing | Row spacing |
|---|---|---|
| Indeterminate, staked | 18 in | 48 in |
| Indeterminate, caged | 30 in | 48 in |
| Indeterminate, sprawling | 36 in | 54 in |
| Determinate, staked | 18 in | 36 in |
| Determinate, caged | 24 in | 42 in |
| Dwarf / container | 12 to 14 in | 18 to 24 in |
How does the spacing calculation work?
The tool looks up a recommended in-row and row spacing for your variety and support, then uses your bed size to estimate capacity.
Number of rows = bed width in inches divided by row spacing (at least 1)
Total plants = plants per row times number of rows
Footprint per plant = in-row divided by 12, times row divided by 12
Closer spacing fits more plants but reduces airflow, which raises disease risk; wider spacing gives bigger, healthier plants and easier picking.
Worked example
Say you grow indeterminate tomatoes in cages in a bed 8 feet long and 4 feet wide. Caged indeterminates want about 30 inches in-row and 48 inches between rows. That is 96 inches divided by 30, or about 3 plants per row, and 48 inches divided by 48, or 1 row, so the bed holds roughly 3 plants, each with about 10 square feet.
Factors that change your spacing
- Variety vigor: large indeterminate heirlooms need more room than compact determinates.
- Support method: staking and pruning to one stem lets plants sit closer than caging or sprawling.
- Airflow and disease pressure: humid climates need wider spacing to dry leaves and cut fungal risk.
- Pruning: plants pruned to one or two stems tolerate tighter spacing than unpruned ones.
- Access: leave a path wide enough to walk, pick, and prune without crowding.
Understanding your outputs
| Output | Meaning | Best used for |
|---|---|---|
| In-row spacing | Gap between plants in a row | Marking planting holes |
| Row spacing | Gap between rows | Laying out beds and paths |
| Footprint | Square feet per plant | Comparing intensive versus roomy layouts |
| Plants that fit | Capacity of your bed | Deciding how many seedlings to buy |
When to use it
Use the calculator when planning a new bed or container layout, when deciding how many seedlings to buy or start, and when switching support methods, since caging needs more room than staking. Square-foot and intensive gardeners use it to balance plant count against airflow and disease risk.
Common mistakes to avoid
- Crowding for more plants: tight spacing traps humidity and spreads blight, lowering total yield.
- Ignoring row spacing: plants set in narrow rows shade each other and are hard to pick.
- Treating all varieties alike: a sprawling heirloom needs twice the room of a dwarf.
- Forgetting paths: leave room to walk and work without trampling roots.
- Spacing by pot size alone: in containers, one plant per large pot beats crowding several.
Accuracy and limitations
The calculator gives sound general spacing, but your variety and climate fine-tune it.
What it calculates accurately: standard in-row and row spacing by variety and support, plus bed capacity from your dimensions.
What it does not account for: exact cultivar size, pruning style, local disease pressure, or irregular bed shapes. In humid regions or for large heirlooms, err toward the wider end.
Methodology
Method: variety-and-support spacing lookup with bed-capacity math. Inputs used: variety type, support method, optional bed length and width. Reference spacing: indeterminate 18 to 36 in in-row and 48 to 54 in rows; determinate 18 to 24 in and 36 to 42 in rows; dwarf 12 to 14 in. Rounding: plant counts rounded down to whole plants. Edge cases: zero or empty bed size shows spacing only, without capacity.
Sources: Iowa State University Extension – Growing Tomatoes, Royal Horticultural Society – Tomatoes, The Old Farmer’s Almanac – Tomatoes. Last reviewed: September 24, 2026 · Reviewed by Aiza Anwar.
Frequently asked questions
How far apart should you plant tomatoes?
Space most tomatoes 18 to 36 inches apart in rows 3 to 4 feet apart. Staked plants can sit at 18 inches; caged and sprawling plants need 24 to 36 inches.
How far apart to plant determinate tomatoes?
Set determinate tomatoes about 18 to 24 inches apart in rows 3 to 3.5 feet apart, since they stay compact and bushy.
How far apart to space indeterminate tomatoes?
Give indeterminate tomatoes 18 inches if staked, 24 to 30 inches if caged, and 36 inches or more if left to sprawl, with rows about 4 feet apart.
Can you plant tomatoes too close together?
Yes. Crowded tomatoes compete for light and nutrients and trap humidity, which spreads fungal disease and lowers overall yield.
How many tomato plants per square foot?
Full-size tomatoes need about 2 to 4 square feet each, so plan roughly one plant per 4 square-foot area, not one per square foot.
How far apart to plant tomatoes in a raised bed?
In a raised bed, space tomatoes 18 to 24 inches apart and stake or prune them, since beds are intensive and airflow matters more.
How many tomato plants in a 4×8 raised bed?
A 4 by 8 foot bed holds about 6 to 8 staked tomatoes, or 3 to 4 caged plants that need wider spacing.
How far apart to space tomatoes in containers?
Grow one full-size tomato per 5-gallon or larger container. Dwarf types can share a large planter at about 12 to 14 inches apart.
Does closer spacing increase tomato yield?
Only up to a point. Beyond it, crowding cuts light and airflow, so total healthy yield falls even with more plants.
Related tomato tools
Visit the Growing Tomatoes hub
This calculator provides general planning guidance, not a rule for every cultivar or climate. In humid regions or for large heirlooms, use wider spacing. Spotted an error? Tell us here.