Phone Drop Test Height Calculator
Pick a height and a surface. The calculator returns the impact speed, the energy the glass has to absorb, the peak g load, and the damage number the drop bench on this site would score it.
Model: free fall, v = √(2gh), g = 9.81 m/s². Energy at a 200 g handset. Peak g assumes the phone stops in 1.6 ms, which is roughly the contact time of a rigid corner hit. Damage follows the same curve the game uses: 100 × (v / 25)1.7 × surface / toughness.
What the numbers mean
| Drop | Impact speed | Energy (200 g) | Real-world outcome on concrete |
|---|---|---|---|
| 0.5 m — pocket | 3.1 m/s | 1.0 J | Scuffs, no cracked glass |
| 1.5 m — ear height | 5.4 m/s | 2.9 J | Corner chip on the frame, glass usually survives |
| 3 m — ladder | 7.7 m/s | 5.9 J | Spiderweb crack, digitizer often still works |
| 8 m — balcony | 12.5 m/s | 15.7 J | Glass gone, body bent, battery usually intact |
| 20 m — roof | 19.8 m/s | 39.2 J | Totaled; the phone stops being one object |
Those outcomes are what a real handset does. The bench's own damage score runs lower on purpose: a 20 m drop on concrete scores about 54 there, because the game needs a couple of impacts to fill the bar and end a round.
Speed grows with the square root of height, which is why the numbers feel unintuitive: four times the height is only twice the speed. Damage, though, follows a power curve on that speed, so it climbs much faster than the fall does. Going from a 1.5 m pocket drop to a 3 m ladder drop doubles the energy and roughly doubles the damage score — and the step from there to 8 m more than doubles it again.
Why the surface matters more than the phone
Concrete returns almost nothing and forces the glass to absorb the whole stop. Carpet at a quarter of that hardness spreads the deceleration over a longer contact, and water is barely a collision at all until water reaches the seals. On the calculator, moving the same 1.5 m drop from concrete to carpet turns a cracked-corner score into a scuff.
Handset toughness cuts the damage by about 40 percent across the whole range, from budget plastic to a titanium flagship. Big, but not as big as height: dropping a flagship from 8 m still beats dropping a budget phone from 1.5 m, nearly every time.
How to read the damage figure
- Under 20 — cosmetic. The chassis took a hit, the glass is fine.
- 20 to 55 — cracked glass somewhere, usually the corner that landed first.
- 55 to 99 — multiple cracks, screen artefacts, touch sensors failing at the edges.
- 100 and over — totaled. On the bench this ends the round with a destroy bonus.
Real handsets do not fail on a smooth curve: there is a threshold where the glass either survives or it does not. The curve here is the bench's scoring model, tuned so a round lasts about two minutes — not a materials simulation. For the engineering version of this problem, look at drop-tower data from the manufacturers.
Try the same drop on the bench
The drop bench runs this exact physics with chips attached to it: four drops per handset, damage as currency, and a repair bill that makes you decide whether the next impact is worth it. If you want the short version of the physics instead, readhow high a phone can fall before it breaks.