Simple hashrate calculation app...

Actually, the code's so simple I might as well post it here. Contents of the form, minus the properties section.

Private d As Double
Private c As Double
Private a As Double
Private b As Double
Private dnc As Boolean
Private tmh As Double
Private tmm As Double
Private tmd As Double
Private indbl As Double
Private basea
Private baser

Private Sub Command1_Click()
On Error GoTo nosubnoa
d = Text3.Text
a = Text4.Text / Text2.Text
b = d / a
'Text5.Text = Int(b)
'Text6.Text = Int(b / 1000000)
'Text7.Text = Int(b / 1000000000)
Text5.Text = b
Text6.Text = Int((b / 1000000) * 100000) / 10000
Text7.Text = Int((b / 1000000000) * 100000) / 100000
Exit Sub
nosubnoa:
MsgBox "Enter a valid value."
End Sub

Private Sub Command2_Click()
On Error GoTo nosubnob
a = Text3.Text
b = Text14.Text
c = a / b
d = c * Text2.Text
tmm = d
tmh = d / 60
tmd = d / 60 / 24
Text15.Text = Int(tmm)
Text16.Text = Int(tmh)
Text17.Text = Int(tmd)
tmdc = Int(tmd)
tmhc = Int(tmh - tmdc * 24)
tmmc = Int(tmm - tmhc * 60 - tmdc * 60 * 24)
Text18.Text = tmdc & " days, " & tmhc & " hours, " & tmmc & " minutes per block."

Text13.Text = Text14.Text / 1000000
Text12.Text = Text14.Text / 1000000000
'Text18.Text = Int(d / 60 / 24) & " days, " & (Int(d / 60) - Int(d / 60 / 24) * 60) & " hours, " & _
Int(d - (Int(d / 60) - Int(d / 60 / 24) * 60) * 60) & " minutes."
Exit Sub
nosubnob:
MsgBox "Enter a valid value."
End Sub

Private Sub Command3_Click()
On Error GoTo nosubnoc
a = Text3.Text
b = Text13.Text * 1000000
c = a / b
d = c * Text2.Text
tmm = d
tmh = d / 60
tmd = d / 60 / 24
Text15.Text = Int(tmm)
Text16.Text = Int(tmh)
Text17.Text = Int(tmd)
tmdc = Int(tmd)
tmhc = Int(tmh - tmdc * 24)
tmmc = Int(tmm - tmhc * 60 - tmdc * 60 * 24)
Text18.Text = tmdc & " days, " & tmhc & " hours, " & tmmc & " minutes per block."
Text14.Text = Text13.Text * 1000000
Text12.Text = Text13.Text / 1000
'Text18.Text = Int(d / 60 / 24) & " days, " & (Int(d / 60) - Int(d / 60 / 24) * 60) & " hours, " & _
Int(d - (Int(d / 60) - Int(d / 60 / 24) * 60) * 60) & " minutes."
Exit Sub
nosubnoc:
MsgBox "Enter a valid value."
End Sub

Private Sub Command4_Click()
On Error GoTo nosubnod
a = Text3.Text
b = Text12.Text * 1000000000
c = a / b
d = c * Text2.Text
tmm = d
tmh = d / 60
tmd = d / 60 / 24
Text15.Text = Int(tmm)
Text16.Text = Int(tmh)
Text17.Text = Int(tmd)
tmdc = Int(tmd)
tmhc = Int(tmh - tmdc * 24)
tmmc = Int(tmm - tmhc * 60 - tmdc * 60 * 24)
Text18.Text = tmdc & " days, " & tmhc & " hours, " & tmmc & " minutes per block."
Text14.Text = Text12.Text * 1000000000
Text13.Text = Text12.Text * 1000
'Text18.Text = Int(d / 60 / 24) & " days, " & (Int(d / 60) - Int(d / 60 / 24) * 60) & " hours, " & _
Int(d - (Int(d / 60) - Int(d / 60 / 24) * 60) * 60) & " minutes."
Exit Sub
nosubnod:
MsgBox "Enter a valid value."
End Sub

Private Sub Command5_Click()
On Error GoTo nolol
baser = InputBox("Enter hashrate in hash/s." & vbNewLine & "Add 000 000 000 for ghash/s. Eg." & vbNewLine & vbNewLine & "1972 ghash/s = 1972 000 000 000 hash/s.") / 1000000000
basea = InputBox("Time in minutes to find a block at " & baser & " ghash/s?")
Text1.Text = baser / 1000000000
Text8.Text = baser / 1000000
Text2.Text = basea
Exit Sub
nolol:
MsgBox "Edit cancelled."
End Sub

Private Sub Command6_Click()
End
End Sub

Private Sub Form_Load()
basea = 78
baser = 1972
End Sub

Private Sub insmnubut_Click()
MsgBox "Bitcoin ref-based calc, 1.0" & vbNewLine & vbNewLine & _
"This calculator does not attempt to approximate time " & vbNewLine & _
"to completion via the difficulty. Rather, you can input " & vbNewLine & _
"a known set of values - for instance, the hashrate and " & vbNewLine & _
"average findrate of a given mining pool - and calculate " & vbNewLine & _
"your performance based on that." & vbNewLine & vbNewLine & _
"Please note the default time ratio is relevant as of 24/6/11." & vbNewLine & _
"The program makes no attempt to correct this ratio via " & vbNewLine & _
"difficulty, and so you will NEED TO MANUALLY SET IT " & vbNewLine & _
"YOURSELF. It's self-explanitory. Enter hashrate in hash/s," & vbNewLine & _
"not khash, mhash or ghash/s." & vbNewLine & vbNewLine & _
"TO calc by time, simply enter the time in minutes you " & vbNewLine & _
"want to take to generate a block at the power of the " & vbNewLine & _
"reference miner, and click Calculate to see the required" & vbNewLine & _
"hashrate. Twice the time will require half the power." & vbNewLine & vbNewLine & _
"TO calc by hashrate is fairly self-explanitory. Enter your" & vbNewLine & _
"desired rate in the relevant box and hit the button next " & vbNewLine & _
"to it. Results appear directly beneath - the minutes, " & vbNewLine & _
"hours and days are each totals." & vbNewLine & vbNewLine & _
"Brought to you by Ruski."

End Sub

Private Sub mnuabt_Click()
MsgBox "Brought to you by Ruski." & vbNewLine & vbNewLine & _
"I know you have no idea of whom Ruski may be." & vbNewLine & vbNewLine & _
"I'm also quite OK with this." & vbNewLine & vbNewLine & _
"Enjoy responsibly."
End Sub

Private Sub mnuexit_Click()
End
End Sub

Private Sub Text1_Change()
On Error GoTo nochangea
If dnc = True Then Exit Sub
dnc = True
Text3.Text = Text1.Text * 1000000000
Text8.Text = Text1.Text * 1000
indbl = basea * (baser / Text1.Text)
Text2.Text = Int(indbl)
dnc = False
nochangea:
dnc = False
Exit Sub
End Sub

Private Sub Text3_Change()
On Error GoTo nochangeb
If dnc = True Then Exit Sub
dnc = True
Text1.Text = Text3.Text / 1000000000
Text8.Text = Text3.Text / 1000000
dnc = False
indbl = basea * (baser / Text1.Text)
Text2.Text = Int(indbl)
Exit Sub
nochangeb:
dnc = False
Exit Sub
End Sub

Private Sub Text8_Change()
On Error GoTo nochangec
If dnc = True Then Exit Sub
dnc = True
Text3.Text = Text8.Text * 1000000
Text1.Text = Text8.Text / 1000
dnc = False
indbl = basea * (baser / Text1.Text)
Text2.Text = Int(indbl)
nochangec:
dnc = False
Exit Sub
End Sub