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Generally, tanks storing the liquid fuel/oxidizer combination used for rockets all have the same mass fraction. For example: all 1.25m FL-T tanks have a mass fraction of 9 (meaning 8 tons of fuel for every 1 ton of dry mass). The 1.875m FL-TX tanks also have a mass fraction of 9. As does the 2.5m Rockomax X series... and the 3.75m Kerbodyne S3 series... and even the 5m Kerbodyne S4 series.

If you look at different fuel types, then you start to see differences. For example, the three tanks in the FL-R monopropellant tank series all have different mass fractions (5, 7, and 8.5, resectively). The liquid fuel fuselages used in aircraft also do not always follow a consistent pattern.

To determine the mass fraction, simply divide the full weight of the tank by its empty weight.

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@American Patriot:

Ask not what your forum can do for you ....

Part Size Cost Full Empty Mass Ratio Cost per Tonne
R-4 'Dumpling' External Tank Radial mounted 50 0.1238 0.0138 9.0 404

R-11 'Baguette' External Tank

Radial mounted 50 0.3038 0.0338 9.0 165
R-12 'Doughnut' External Tank Small 147 0.3375 0.0375 9.0 436
Oscar-B Fuel Tank Tiny 70 0.2250 0.0250 9.0 311
FL-T100 Fuel Tank Small 150 0.5625 0.0625 9.0 267
FL-T200 Fuel Tank Small 275 1.1250 0.1250 9.0 244
FL-T400 Fuel Tank Small 500 2.2500 0.2500 9.0 222
FL-T800 Fuel Tank Small 800 4.5000 0.5000 9.0 178
Rockomax X200-8 Fuel Tank Large 800 4.5000 0.5000 9.0 178
Rockomax X200-16 Fuel Tank Large 1550 9.0000 1.0000 9.0 172
Rockomax X200-32 Fuel Tank Large 3000 18.0000 2.0000 9.0 167
Rockomax Jumbo-64 Fuel Tank Large 5750 36.0000 4.0000 9.0 160
Kerbodyne S3-3600 Tank Extra large 3250 20.2500 2.2500 9.0 160
Kerbodyne S3-7200 Tank Extra large 6500 40.5000 4.5000 9.0 160
Kerbodyne S3-14400 Tank Extra large 13000 81.0000 9.0000 9.0 160
Mk2 Rocket Fuel Fuselage Short Mk2 750 2.2900 0.2900 7.9 328
Mk2 Rocket Fuel Fuselage Mk2 1450 4.5700 0.5700 8.0 317
Mk3 Rocket Fuel Fuselage Short Mk3 2500 14.2900 1.7900 8.0 175
Mk3 Rocket Fuel Fuselage Mk3 5000 28.5700 3.5700 8.0 175
Mk3 Rocket Fuel Fuselage Long Mk3 10000 57.1400 7.1400 8.0 175
C7 Brand Adapter - 2.5m to 1.25m Small, Large 800 4.5700 0.5700 8.0 175
C7 Brand Adapter Slanted - 2.5m to 1.25m Small, Large 800 4.5700 0.5700 8.0 175
Mk2 to 1.25m Adapter Small, Mk2 550 2.2900 0.2900 7.9 240
Mk2 to 1.25m Adapter Long Small, Mk2 1050 4.5700 0.5700 8.0 230
Mk2 Bicoupler Small, Mk2 x 2 860 2.2900 0.2900 7.9 376
2.5m to Mk2 Adapter Large, Mk2 800 4.5700 0.5700 8.0 175
Mk3 to Mk2 Adapter Mk2, Mk3 2200 11.4300 1.4300 8.0 192
Mk3 to 2.5m Adapter Large, Mk3 2500 14.2900 1.7900 8.0 175
Mk3 to 2.5m Adapter Slanted Large, Mk3 2500 14.2900 1.7900 8.0 175
Mk3 to 3.75m Adapter Extra large, Mk3 2500 14.2900 1.7900 8.0 175
Kerbodyne ADTP-2-3 Large, Extra large 1623 16.8800 1.8800 9.0 96
Mk0 Liquid Fuel Fuselage Tiny 200 0.2750 0.0250 11.0 727
Mk1 Liquid Fuel Fuselage Small 550 2.2500 0.2500 9.0 244
Mk2 Liquid Fuel Fuselage Short Mk2 750 2.2900 0.2900 7.9 328
Mk2 Liquid Fuel Fuselage Mk2 1450 4.5700 0.5700 8.0 317
Mk3 Liquid Fuel Fuselage Short Mk3 4300 14.2900 1.7900 8.0 301
Mk3 Liquid Fuel Fuselage Mk3 8600 28.5700 3.5700 8.0 301
Mk3 Liquid Fuel Fuselage Long Mk3 17200 57.1400 7.1400 8.0 301
NCS Adapter Small, Tiny 320 0.5000 0.1000 5.0 640
FL-R10 RCS Fuel Tank Tiny 200 0.1000 0.0200 5.0 2000
FL-R25 RCS Fuel Tank Small 330 0.5600 0.0800 7.0 589
FL-R1 RCS Fuel Tank Large 1800 3.4000 0.4000 8.5 529
Mk2 Monopropellant Tank Mk2 750 1.8900 0.2900 6.5 397
Mk3 Monopropellant Tank Mk3 5040 9.8000 1.4000 7.0 514
Stratus-V Roundified Monopropellant Tank Radial mounted 200 0.1000 0.0200 5.0 2000
Stratus-V Cylindrified Monopropellant Tank Radial mounted 250 0.2300 0.0300 7.7 1087
PB-X50R Xenon Container Radial mounted 2220 0.0540 0.0140 3.9 41111
PB-X150 Xenon Container Tiny 3680 0.1000 0.0240 4.2 36800
PB-X750 Xenon Container Small 24300 0.7600 0.1900 4.0 31974
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