Penetration Calculator

Use the calculator on this page to estimate penetration for armour piercing projectiles. Read a bit more about the equations and see an example here.
Estimate:
Caliber mm
Mass kg
Velocity m/s
Penetration mm
Reference (DeMarre only):
Caliber mm
Mass kg
Velocity m/s
Penetration mm

18 comments:

  1. Anonymous1 March 2015 at 11:29

    I'm not sure what it is but there is some problem with the right side (DeMarre) Penetration result. You have to enter a value there and then one pops into the left side (Krupp) Penetration. This is confusing.

    -m

    ReplyDelete
    Replies
    1. Peter1 March 2015 at 14:35

      That's intentional, but I can see how that would be confusing. I'll get around to changing it.

      Delete
  2. Anonymous22 April 2015 at 17:58

    At what range and angle the penetration value is given?

    Is it point blank, i.e. 0 meters @ 90 degree?

    Thanks.

    ReplyDelete
    Replies
    1. Peter23 April 2015 at 00:29

      Depends on what range the shell achieves that velocity at. Penetration for Krupp is 90 degrees, penetration for DeMarre is at whatever your reference angle is.

      Delete
  3. Anonymous23 February 2016 at 10:44

    This comment has been removed by a blog administrator.

    ReplyDelete
  4. Federal Bureau of Investigation Surveillance Network19 June 2016 at 20:03

    This comment has been removed by the author.

    ReplyDelete
  5. Alexander-Maximilian14 July 2017 at 08:20

    Your calculator isn't working properly. When you try to get the results for the DeMarre calculation it gives you a result of "NaN"

    ReplyDelete
    Replies
    1. Peter14 July 2017 at 09:52

      It's working for me. Make sure to fill out all the fields in the Reference section and all fields in the Estimate section except Penetration. If it still doesn't work, post your browser and console output.

      Delete
  6. Unknown1 January 2019 at 09:39

    The DeMarre calculator doesn't work.
    Filled out the conditions for Calibre, Mass and Velocity but when clicking the Calculate (DeMarre) button it just gives a NaN message in the Top penetration calculator.

    ReplyDelete
    Replies
    1. Peter1 January 2019 at 14:57

      You need to enter reference values in the lower set of boxes if you want the DeMarre calculation.

      Delete
    2. Unknown24 March 2019 at 02:53

      Thanks it's working now

      Delete
  7. Jayhawker16 February 2019 at 23:20

    Can you post the DeMarre equation. I can't find it anywhere

    ReplyDelete
    Replies
    1. Peter17 February 2019 at 00:58

      http://tankarchives.blogspot.com/2014/10/penetration-equations.html

      Delete
    2. Jayhawker17 February 2019 at 10:33

      Thanks!

      Delete
  8. Unknown14 July 2019 at 08:36

    I might not be entering the values correctly, but I am finding it very difficult to get 150mm of penetration with a 77mm shell like the 17 pounder was historically capable off.

    ReplyDelete
    Replies
    1. Peter14 July 2019 at 13:00

      The Krupp method does give values that are too low, but I plugged in British data for the 6-pounder (2.7 kg shell, 900 m/s muzzle velocity, 101 mm of penetration) and got 152 mm of penetration for the 17-pdr.

      Delete
  9. peter.f.model22 November 2019 at 18:43

    My Experiments.
    For HMG rounds I am seeing rather high values, for example. 15mm HMG, 0.076kg, 890mps penetration is 26mm, I am assuming ta 90° at peak velocity. This seems a bit high as MG151/15 mm cannon firing AP rounds should achieve 16mm at 30° from horizontal – which is about 18mm of armour. This is a 100m and a small round like that may lose momentum quickly, but at 500m its penetration only drops by 1mm so I am uncertain. The Germans liked using an APHE round, so this could be the cause, but the Besa has similar values. Not a major issue, but interesting.
    The 12.7mm round, in this case an AP W.Mk.1, weights 0.038kg with a velocity of 787mps can penetrate 11mm@30° - which is about 12-13mm of armour. The calculator shows 18mm. If we use an AP/T round which has a higher velocity the penetration is 20mm.
    For the 6-pounder, using the L43 version the British normally used rather than the L43 the US preferred, the APCBC round (APCBC,Mk 1T) has a velocity of 823mps and weights 3.3 penetrates 83mm. British tests show a value of 112mm@90° at 100m. This seems a bit low. If we look at the APC round (APC, Mk8T) the weight is 2.86kg and velocity is 946mps we get an 88mm value. This is more accurate as British tests show 92mm@90° at 100m. At 500m this drops to 83mm. Note: The error could be caused by converting yards to metres. Finally the APDS round, APDS Mk 1T, weights 1.42kg and has a velocity of 1151mps which comes in at 76mm. As this had a value of 120mm@60°, or about 132mm@90°, at 100m. I suspect if using exotic rounds like APDS the calculator does not work, but its acceptable for most rounds such as APHE, AP, APC, APCBC and APBC. I do not have the weight for an APDS would with sabot, perhaps if this is added in the values will look better.
    Generally this is a good attempt.

    ReplyDelete
    Replies
    1. Unknown23 December 2019 at 23:04

      Are you using a reference round? If so, the reference round should of course be similar to the hypothetical. So WWII Soviet APCR would compare nicely with WWII German APCR.

      Delete

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