Field of View Calculator
🔬 Cells & microscopy. Use the Field of view formula to find field of view, field number, objective lens: pick the value you want, type the others, and the answer updates as you go.
The field number is printed on the eyepiece (often 18 mm). Converted to µm here.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Field of view | µm |
| Field number | mm |
| Objective lens | × |
Worked example
Find the field of view when Field number = 18 mm, Objective lens = 40 ×.
Using field of view = field numberMobjective: Field of view = 450 µm.
Frequently asked questions
What is the formula for Field of view?
field of view = field numberMobjective. The field number is printed on the eyepiece (often 18 mm). Converted to µm here.
What do the letters stand for, and what units are used?
Field of view in µm, Field number in mm, Objective lens in ×.
How do you calculate field of view?
Put the values into field of view = field numberMobjective. For example, with Field number = 18 mm, Objective lens = 40 ×, field of view = 450 µm.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (field of view, field number, objective lens) and fill in the others: it rearranges the formula for you.
