Droid Calc
Droid Calc is our awesome, super fast easytouse fullfledged calculator which we especially designed for Android.
The app shares many features with old school calculator:
it comes with decimal, sexagesimal, exponential and fractional displays. It performs arithmetic,
trigonometric and logarithmic functions. It knows about permutations, combinations and coordinate
conversion. And you have 7 memory cells to store your results.
Choose the way you want to input arithmetic expressions. With input method "infix" you can type "sin 45".
You would type "45 sin" if you prefer the oldstyle input method.
While old school calculator is optimized for the iPad, Droid Calc is made for Android:
 It's super fast and has an awesome responsiveness.
 Swipe the display and switch seamlessly between 4 different scientific skins and one basic skin.
 The layout adapts itself to different device configurations.
 It makes use of Android specific features, such as haptic feedback, or the standard
menu button.
Really simple input
Droid Calc knows about precedence rules.
Example: 10 + 2×6  15 ÷ (1 + 2) = 17
input 
display 
1
0
+

10. +

2
×
6


22. 

1
5
÷
(

( 0.

1
+
2
)

3.

=

= 17.

The following examples use a shorter notation.
Instead of 10.25 you would type
10.25.
Droid Calc accepts algebraic (infix) and oldstyle input methods.
You can set the input method to be used on the settings menu.
An example with algebraic (infix) input method: √2 ÷ cos 45° = 2
√2÷cos45+/== 2.
The same example with oldstyle input method: √2 ÷ cos 45° = 2
2√÷45+/cos== 2.
Number input
Category 
Example 

Input 
rational numbers 
0.3 

.3 or 0.3 
negative numbers 
4.7 

4.7+/ 
exponential notation 
3×10^{2} 
(=300) 
3EXP2 

5.2×10^{3} 
(=5200) 
5.2+/EXP3 

8.3×10^{4} 
(=0.00083) 
8.3+/EXP4+/ 
pi 
π 
(=3.141592653...) 
EXP 
fractions 
2/3 
(=0.666666...) 
2a b/c3 

5 1/4 
(=5.25) 
5a b/c1a b/c4 
degrees 
5° 20' 30" 
(=5.341666...) 
5° ' "20° ' "30° ' " 
Functions 1
argumentfunction
For these functions you enter the argument followed by the function key.

Function 
Example 
Input 
Display 
1/x 
Reciprocal 
2^{1} = 0.5 
21/x= 
0.5 
x^{2} 
Square 
3^{2} = 9 
3x^{2}=

9. 
x! 
Factorial 
3! = 6 
3SHIFTx!= 
6. 
Functions 2
Droid Calc comes with 2 input methods: algebraic (infix) and oldstyle.
You can set the input method to be used on the settings menu.
algebraic (infix) input method
functionargument
Modern scientific calculators often use algebraic (infix) input method.
For these functions you press the function key followed by the argument if the
input method is set to algebraic (infix).

Function 
Example 
Display 
√ 
Square root 
√9 = 3
√9= 
3. 
^{3}√ 
Cube root 
^{3}√27 = 3
SHIFT^{3}√27=

3. 
log 
Common logarithm 
log 100 = 2
log100= 
2. 
10^{x} 
Powers of 10 
10^{2} = 100
SHIFT10^{x}2= 
100. 
ln 
Natural logarithm 
ln 10 = 2.302585093
ln10=

2.302585093 
e^{x} 
Powers of e 
e^{2.302585093} = 10
SHIFTe^{x}2.302585093=

10. 
sin cos tan 
Sine, cosine, tangent 
sin 30° = 0.5
sin30= 
0.5 
sin^{1} cos^{1} tan^{1} 
Arc sine, cosine, tangent 
asin 0.5 = 30°
SHIFTsin^{1}.5= 
30. 
hypsin
hypcos
hyptan 
Hyperbolic
sine, cosine, tangent 
sinh 5 = 74.20321058
hypsin5= 
74.20321058 
hypsin^{1}
hypcos^{1}
hyptan^{1} 
Inverse hyperbolic
sine, cosine, tangent 
sinh^{1} 74.20321058 = 5
SHIFThypsin^{1}74.20321058= 
5. 
oldstyle input method
argument function
Older, more basic calculators often use this input method.
For these functions you enter the argument first and then
press the function key if the oldstyle input method is set.

function 
example 
display 
√ 
Square root 
√9 = 3
9√= 
3. 
^{3}√ 
Cube root 
^{3}√27 = 3
27SHIFT^{3}√=

3. 
log 
Common logarithm 
log 100 = 2
100log= 
2. 
10^{x} 
Powers of 10 
10^{2} = 100
2SHIFT10^{x}= 
100. 
ln 
Natural logarithm 
ln 10 = 2.302585093
10ln=

2.302585093 
e^{x} 
Powers of e 
e^{2.302585093} = 10
2.302585093SHIFTe^{x}=

10. 
sin cos tan 
Sine, cosine, tangent 
sin 30° = 0.5
30sin= 
0.5 
sin^{1} cos^{1} tan^{1} 
Arc sine, cosine, tangent 
asin 0.5 = 30°
.5SHIFTsin^{1}= 
30. 
hypsin
hypcos
hyptan 
Hyperbolic
sine, cosine, tangent 
sinh 5 = 74.20321058
5hypsin= 
74.20321058 
hypsin^{1}
hypcos^{1}
hyptan^{1} 
Inverse hyperbolic
sine, cosine, tangent 
sinh^{1} 74.20321058 = 5
74.20321058SHIFThypsin^{1}= 
5. 
Functions with two arguments
argument 1functionargument 2

function 
example 
display 
x^{y} 
Powers 
2^{3} = 8
2x^{y}3= 
8. 
^{x}√ 
Roots 
^{7}√128 = 2
7SHIFT^{x}√128= 
2. 
nPr 
Permutations 
6 nPr 3 = 120
6SHIFTnPr3= 
120. 
nCr 
Combinations 
6 nCr 3 = 20
6SHIFTnCr3= 
20. 
R→P 
Rectangular to polar coordinate conversion 
x=3, y=4: 3 RP 4 = 5 (r), 53.13010235 (θ)
3SHIFTR→P4= 
r = 5. 


SHIFTx ↔ y 
θ = 53.13010235 
P→R 
Polar to rectangular coordinate conversion 
r=2, θ=60: 2 PR 60 = 1 (x), 1.732050808 (y)
2SHIFTP→R60= 
x = 1. 


SHIFTx ↔ y 
y = 1.732050808 
Percentage calculations
You can set the kind of percentage calculation to be used on the settings page
(gear in top right corner).
Percentage calculations  advanced
Modern scientific calculators often use this kind of percentage calculation. The advanced percentage
calculation answers several questions easily.
19% of 120 = 22.8
120×19SHIFT%
22.8
Percentage of 80 represented by 25 = 31.25%
25÷80SHIFT%
31.25
19% addon of 120 = 142.8
120×19SHIFT%+
142.8
30% discount of 1000 = 700
1000×30SHIFT%
700.
20 apples are added to a basket with 50 apples. What is the percentage of the new number of
apples to the initial number of apples?: 140%
20+50SHIFT%
140.
If you got 50 EUR last week and 80 EUR this week, what is the percent increase?: 60%
8050SHIFT%
60.
Percentage calculations  simple
Basic calculators come often with this kind of percentage calculation.
example 
input 
display 
200 + 19% = 238 
200+19SHIFT%= 
238. 
238  19% = 192.78 
23819SHIFT%= 
192.78 
200 ÷ 50% = 2 
200÷50SHIFT%= 
2. 
200 × 50% = 20000 
200×50SHIFT%= 
20000. 
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History
Version 1.2
Google Play Store 20110813.
 new: key vibration switch.
 change: new icon.
Version 1.1
Google Play Store 20110619.
 new: 4 additional skins. Swipe the display and change between a basic skin and 4 scientific skins.
 bugfix: cube root.
Version 1.0
Google Play Store 20110613.
