Is the BGS number a final grade?
No. It is a centering subgrade estimate. The final grade also depends on the other condition subgrades and Beckett's professional review.
Beckett centering planning tool
BGS Centering Calculator
BGS reports centering as a subgrade on a half-point scale. This calculator applies the project's pinned BGS front/back threshold table to the worse axis, while keeping the result separate from corners, edges and surface.
Your photo never leaves your browser while you measure; transfer happens only when you choose a full grade
Using the BGS centering calculator
- Measure front and back because the pinned BGS table applies different tolerance ladders to each side.
- Use repeatable card and design boundaries; a one-pixel line adjustment matters more on a small or perspective-skewed image.
- A centering subgrade is one input to a BGS estimate, not a standalone final grade.
What the result can tell you
- The displayed BGS value estimates only the centering subgrade supported by your ratios.
- A full BGS estimate also needs measured corners, edges and surface; the weakest subgrades constrain the final result.
Centering threshold reference
BGS (Beckett)
A BGS 10 needs front centering of 55/45 or better, with back centering of 55/45 or better.
BGS reports centering as a subgrade and uses distinct front/back tolerances in this pinned table.
| Tier | Front | Back |
|---|---|---|
| 10 | 55/45 | 55/45 |
| 9.5 | 55/45 | 60/40 |
| 9 | 60/40 | 65/35 |
| 8.5 | 65/35 | 70/30 |
| 8 | 70/30 | 75/25 |
| 7 | 75/25 | 80/20 |
Common questions
Why can front and back measurements produce a lower result?
The calculator checks both sides against their respective thresholds and uses the first tier that both measurements clear.