Enter the total screen area (mm^2) and the total body area (mm^2) into the Screen to Body Ratio Calculator. The calculator will evaluate and display the Screen to Body Ratio.
Screen to Body Ratio Formula
The screen-to-body ratio measures how much of a device’s front surface is active display area. It is usually shown as a percentage. A higher percentage means more screen space is packed into the same overall device footprint.
SBR = \frac{SA}{BA} \times 100- SBR = screen-to-body ratio as a percentage
- SA = total screen area
- BA = total body area
If you want the result as a raw ratio instead of a percentage, use the same calculation without multiplying by 100.
Ratio = \frac{SA}{BA}How to Calculate Screen to Body Ratio
- Measure or enter the total visible screen area.
- Measure or enter the total front body area of the device.
- Divide the screen area by the body area.
- Multiply by 100 to convert the result to a percentage.
Both area values must use the same units. If the screen area is in mm², the body area must also be in mm². The calculator accepts multiple area units, but they must remain consistent within the same calculation.
Calculating the Areas First
If you only know width and height, calculate each area before finding the ratio.
SA = W_s \times H_s
BA = W_b \times H_b
- Ws = screen width
- Hs = screen height
- Wb = body width
- Hb = body height
Rearranged Screen to Body Ratio Equations
If you know any two values, you can solve for the third.
| Unknown | Formula | Use Case |
|---|---|---|
| Screen to Body Ratio |
SBR = \frac{SA}{BA} \times 100 |
Use when screen area and body area are known. |
| Screen Area |
SA = \frac{SBR}{100} \times BA |
Use when the target percentage and body area are known. |
| Body Area |
BA = \frac{SA \times 100}{SBR} |
Use when screen area and ratio percentage are known. |
Example Calculation
If a device has a screen area of 400 mm² and a body area of 500 mm², the screen-to-body ratio is:
SBR = \frac{400}{500} \times 100 = 80\%An 80% result means 80% of the device’s front face is screen and 20% is occupied by bezels, frame material, sensors, speakers, hinges, or other non-display elements.
How to Interpret the Result
| Result | Interpretation |
|---|---|
| Lower percentage | More of the front face is taken up by bezels or non-screen structure. |
| Higher percentage | More of the front face is usable display area. |
| 100% | The screen area equals the full body area, which is usually a theoretical maximum. |
| Greater than 100% | This normally indicates incorrect measurements, inconsistent units, or a data-entry error. |
Common Mistakes
- Mixing units: Do not combine mm² with cm² or in² unless the values are converted first.
- Using screen diagonal instead of screen area: Diagonal size alone is not enough to calculate area.
- Using total device thickness or side surfaces: Screen-to-body ratio is typically based on the front face only.
- Confusing ratio and percentage: A ratio of 0.80 is the same as 80%.
Why Screen to Body Ratio Matters
- Helps compare display efficiency between devices of different sizes.
- Shows how effectively a design minimizes bezel space.
- Useful for phones, tablets, laptops, monitors, handheld gaming devices, and embedded displays.
- Makes it easier to judge how much usable screen area you get for a given product footprint.
Quick Reference
| Question | What to Do |
|---|---|
| Know screen area and body area? | Calculate the percentage directly. |
| Know width and height only? | Find each area first, then compute the ratio. |
| Comparing two devices? | The higher percentage has more screen relative to its front size. |
| Need the decimal form? | Use the raw ratio before multiplying by 100. |
