Magnification Calculator
🔬 Cells & microscopy. Use the Magnification formula to find magnification, image size, real size: pick the value you want, type the others, and the answer updates as you go.
Use the same units top and bottom. Here the image is in mm and the real object in µm (1 mm = 1000 µm).
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 |
|---|---|
| Magnification | × |
| Image size | mm |
| Real size | µm |
Worked example
Find the magnification when Image size = 100 mm, Real size = 250 µm.
Using magnification = (image size)/(real size): Magnification = 400 ×.
Frequently asked questions
What is the formula for Magnification?
magnification = (image size)/(real size). Use the same units top and bottom. Here the image is in mm and the real object in µm (1 mm = 1000 µm).
What do the letters stand for, and what units are used?
Magnification in ×, Image size in mm, Real size in µm.
How do you calculate magnification?
Put the values into magnification = (image size)/(real size). For example, with Image size = 100 mm, Real size = 250 µm, magnification = 400 ×.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (magnification, image size, real size) and fill in the others: it rearranges the formula for you.
