← Vermels
Free Online Tool
Universal
Calculator
Scientific calculator, unit converter, percentage, date difference, number bases
🌙
🧮
Scientific
%
Percentage
Converters
📏
Unit
🔢
Number Base
📅
Date Diff
🌡
Temperature
0
sin
cos
tan
log
ln
√
∛
xʸ
|x|
π
C
⌫
(
)
%
7
8
9
÷
xʸ
4
5
6
×
e
1
2
3
−
1/x
0
.
±
+
=
% of a number
Percentage
Of number
36
15% of 240
What % is A of B?
A
B
15%
36 is 15% of 240
% change
From
To
+25%
80 → 100 is a 25% increase
Category
Length
Weight / Mass
Area
Volume
Speed
Data Storage
Time
From
To
Value
–
Input Base
Binary (2)
Octal (8)
Decimal (10)
Hex (16)
Number
BIN
11111111
OCT
377
DEC
255
HEX
FF
Start Date
End Date
0
Days
0
Weeks
0
Months
0
Hours
0
Minutes
0
Seconds
–
Celsius (°C)
Fahrenheit (°F)
Kelvin (K)
Rankine (°R)
Frequently Asked Questions
What can this universal calculator do?
Scientific calculations, unit conversion, number base conversion (binary/hex/octal) and date difference — all in one free tool.
Does it work offline?
Yes, once the page is loaded everything runs locally in your browser with no server round-trips.
More free tools:
Finance Calculator
Fuel Calculator
Salary Calculator
Need the desktop app?
View all apps on vermels.com →