Maindeck doorsills on 747 classics have minimum heights from 457 to 478 cm.
On DC-10, the nominal doorsill heights are 480 to 465 cm.
On empty A310-300, the heights are 455 to 480 cm.
On 767-200, the minimum sill heights are 406 to 409 cm.
On empty A330-300, the heights are 455 to 577 cm.
On 777-200, the minimum heights are 471 to 528 cm.
On laden A380, the heights are 512 to 514 cm.
The distance from the sill of front cargo door of DC-10 to the sill of main deck door above is 201 cm. From rear cargo door to main deck door above, 198 cm.
See the implications here. About 200 cm floor to floor. The headroom in underbelly is less than this by the thickness of the main deck. 167 cm on DC-10. Not enough for a stand-up cabin.
On A310, the front maindeck door is 193 cm above belly door, and rear maindeck door is 210 cm above belly door. So, similar range. Headroom is for 163 cm pallets and containers – not standing humans.
On B767, the front maindeck door is 183 cm above belly door, and rear maindeck door is 180 cm above.
On A330 (jacked), the front maindeck doors are 218 cm above belly door, and rear maindeck doors are 219 to 229 cm above belly door. The front underbelly is 171 cm high, rear underbelly 167 cm.
On 777-200, the front maindeck doors are 190 to 207 cm above underbelly door, and the rear doors are 192 to 206 cm above.
On a jacked A380, maindeck doors are 203 cm above belly doors.
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