Reference data · nominal SBS/ANSI values
Well Plate Surface Area & Volume Chart
Growth area, working volume and maximum volume for every standard microplate format, from the roomy 6-well to the high-density 384-well, in one comparison table.
Quick answer
Per-well growth area falls as well count rises: about 9.6 cm² for a 6-well, 3.8 cm² (12-well), 1.9 cm² (24-well), 1.1 cm² (48-well), 0.32 cm² (96-well) and 0.056 cm² (384-well). Working volumes scale the same way, from ~2 mL down to 20–50 µL. Use the ratio of areas to convert cell-seeding densities between formats.
| Plate format | Wells | Growth area / well | Working volume | Max volume | Well pitch |
|---|---|---|---|---|---|
| 6-well plate | 2 × 3 | 9.6 cm² | 1.9–2.5 mL | 16.8 mL | 39.12 mm |
| 12-well plate | 3 × 4 | 3.8 cm² | 1.0–2.0 mL | 6.9 mL | 26.01 mm |
| 24-well plate | 4 × 6 | 1.9 cm² | 0.5–1.0 mL | 3.4 mL | 19.3 mm |
| 48-well plate | 6 × 8 | 1.1 cm² | 0.2–0.5 mL | 1.6 mL | 13 mm |
| 96-well plate | 8 × 12 | 0.32 cm² | 100–200 µL | 360 µL | 9 mm |
| 384-well plate | 16 × 24 | 0.056 cm² | 20–50 µL | 112 µL | 4.5 mm |
Nominal values for standard flat-bottom, TC-treated plates. Deep-well, round- and V-bottom plates differ, so always confirm against the manufacturer datasheet for critical work.
- A 6-well well has ~30× the area of a 96-well and ~170× a 384-well.
- Convert seeding density by the ratio of growth areas between formats.
- Working volume is what you use; max volume is the physical brim capacity.
- Values are nominal for flat-bottom TC plates, so confirm on the datasheet.
How surface area scales across formats
As you move to higher-density plates, per-well growth area falls sharply while total reactions per plate rise. A single 6-well well (~9.6 cm²) has roughly 30× the surface of a 96-well well (~0.32 cm²), and about 170× that of a 384-well. That is why cell-seeding densities and reagent volumes must be recalculated whenever you change format.
Total area tells a different story. Multiply area per well by well count and the whole-plate figure stays inside a threefold range, because denser plates spend their footprint on walls between wells rather than on growth surface:
That is the trade in one line. Moving up a format buys parallel conditions, not extra surface, so a protocol that needs a fixed number of cells per condition needs more plates, not a denser one.
Working volume vs. maximum volume
Working volume is the recommended amount for routine culture or assays: enough to cover cells without spillage or meniscus artefacts on a reader. Maximum volume is the physical capacity of the well; filling to the brim risks cross-contamination and edge effects, so it is rarely used in practice.
Converting cell numbers between formats
To keep confluency comparable when you change format, scale the seeding number by the ratio of growth areas. Moving from a 96-well (≈0.32 cm²) to a 24-well (≈1.9 cm²) is about a 6× larger area, so seed roughly six times as many cells. The same ratio applies to media volume and, approximately, to reagent amounts.
| From → To | Area ratio | Scale cells/volume by |
|---|---|---|
| 96-well → 24-well | ≈ 6× | Seed ~6× more |
| 96-well → 6-well | ≈ 30× | Seed ~30× more |
| 24-well → 96-well | ≈ 0.17× | Seed ~1/6 as many |
| 96-well → 384-well | ≈ 0.18× | Seed ~1/6 as many |
Frequently asked questions
What is the surface area of a 96-well plate well?
Each well of a standard flat-bottom 96-well plate has a growth area of about 0.32 cm², with a working volume of 100–200 µL.
What is the surface area of a 6-well plate?
Each well of a 6-well plate offers roughly 9.6 cm² of growth area, the largest in the standard microplate family, with a working volume of about 1.9–2.5 mL.
What is the surface area of a 384-well plate well?
Each well of a 384-well plate has only about 0.056 cm² of growth area, roughly a sixth of a 96-well, with a working volume of 20–50 µL. It is the smallest format in the standard family.
How do I convert cell numbers between plate formats?
Scale by the ratio of growth areas. For example, moving from a 96-well (~0.32 cm²) to a 24-well (~1.9 cm²) is roughly a 6× larger area, so seed about six times as many cells to keep confluency comparable.
What is the surface area of a 12-well and a 48-well plate?
A 12-well plate provides about 3.8 cm² of growth area per well, and a 48-well about 1.1 cm². As well count rises, per-well area falls while the number of parallel conditions increases.
What is the difference between working volume and total volume?
Working volume is the recommended fill for routine culture or assays; total (maximum) volume is the physical brim capacity of the well. Filling to the maximum risks spillage, cross-contamination and edge effects, so it is rarely used in practice.
How much medium should each well hold?
Use the working volume for the format: roughly 1.9–2.5 mL (6-well), 1–2 mL (12-well), 0.5–1 mL (24-well), 0.2–0.5 mL (48-well), 100–200 µL (96-well) and 20–50 µL (384-well).
- 96-well plate dimensions: full specification (this site)
- Manufacturer datasheets (Corning, Greiner, Thermo Nunc) for exact growth areas.