Markdown Calculator
This tool evaluates mathematical expressions embedded in Markdown documents. Write your content with calculations enclosed in $$ ... $$ or `...`, and see the results when you process it.
Enter Your Markdown with Calculations
How to Use the Markdown Calculator
Calculation Syntax
Embed calculations in your Markdown using either:
- Block calculations:
$$ 5 + 3 * 2 $$(will be evaluated and replaced) - Inline calculations:
`sqrt(16)`(will be evaluated in place)
Supported Mathematical Operations
- Basic arithmetic:
+ - * / ^ - Parentheses for grouping:
(5 + 3) * 2 - Common functions:
sqrt(), sin(), cos(), tan(), log(), exp(), abs(), round() - Constants:
PI, E
Examples
Example 1: Basic Arithmetic
Input:
The result of 5 + 3 is $$ 5 + 3 $$. The area of a circle with radius 4 is $$ PI * (4^2) $$.
Output:
The result of 5 + 3 is 8. The area of a circle with radius 4 is 50.26548.
Example 2: Scientific Calculations
Input:
The square root of 225 is `sqrt(225)`. The sine of 30 degrees is $$ sin(30 * PI / 180) $$.
Output:
The square root of 225 is 15. The sine of 30 degrees is 0.5.
Example 3: Complex Expressions
Input:
The result of (5 + 3) * 2 is $$ (5 + 3) * 2 $$. The exponential of 2 is $$ exp(2) $$.
Output:
The result of (5 + 3) * 2 is 16. The exponential of 2 is 7.38906.
Example 4: Mixed Markdown and Math
Input:
# Physics Calculation The kinetic energy (KE) of a 5kg object moving at 10m/s is: $$ 0.5 * 5 * (10^2) $$ Joules. The natural log of 10 is `ln(10)`.
Output:
# Physics Calculation The kinetic energy (KE) of a 5kg object moving at 10m/s is: 250 Joules. The natural log of 10 is 2.30259.
Example 5: Temperature Conversion
Input:
98.6°F in Celsius is $$ (98.6 - 32) * 5/9 $$. Absolute zero is $$ -459.67 $$°F.
Output:
98.6°F in Celsius is 37. Absolute zero is -459.67°F.
Example 6: Financial Calculation
Input:
After 5 years at 5% interest: $$ 1000 * (1 + 0.05)^5 $$ = `1000 * (1 + 0.05)^5`
Output:
After 5 years at 5% interest: 1276.28156 = 1276.28156
Example 7: Geometry Formulas
Input:
Area of triangle (base=6, height=4): $$ 0.5 * 6 * 4 $$ Volume of sphere (r=3): $$ (4/3) * PI * (3^3) $$
Output:
Area of triangle (base=6, height=4): 12 Volume of sphere (r=3): 113.09734
Example 8: Statistical Functions
Input:
Standard deviation of [5,10,15]: $$ sqrt(( (5-10)^2 + (10-10)^2 + (15-10)^2 ) / 3) $$
Output:
Standard deviation of [5,10,15]: 4.08248
Example 9: Engineering Calculation
Input:
Stress on a beam (F=500N, A=0.01m²): $$ 500 / 0.01 $$ Pa Resistance (V=12V, I=0.5A): $$ 12 / 0.5 $$ Ω
Output:
Stress on a beam (F=500N, A=0.01m²): 50000 Pa Resistance (V=12V, I=0.5A): 24 Ω
Example 10: Nested Calculations
Input:
Compound expression: $$ sqrt( (5^2) + (12^2) ) $$ Nested functions: $$ round( exp( log(10) ) ) $$
Output:
Compound expression: 13 Nested functions: 10
Frequently Asked Questions
1. What syntax should I use for calculations?
Use $$ expression $$ for block calculations (displayed on their own line) and `expression` for inline calculations (within text). For example: The result is `5 + 3` becomes "The result is 8".
2. What mathematical operations are supported?
The calculator supports:
- Basic arithmetic:
+ - * / ^ - Parentheses for grouping:
(5 + 3) * 2 - Functions:
sqrt(), sin(), cos(), tan(), log(), ln(), exp(), abs(), round() - Constants:
PI (3.14159...), E (2.71828...)
3. How precise are the calculations?
Calculations are performed with JavaScript's floating-point precision (about 15-17 significant digits). Results are displayed with up to 5 decimal places by default.
4. Can I use variables in my calculations?
Not in this basic version. Each expression is evaluated independently. For variable support, you would need to repeat values in each calculation.
5. What happens if I make a syntax error?
The tool will show an error message indicating where the problem occurred. For example, if you write $$ 5 + * 3 $$, you'll get an error about invalid syntax.
6. Can I use this for complex documents with headers and lists?
Yes! The calculator processes all Markdown content and only evaluates the expressions within the calculation delimiters ($$ $$ or `` ` ` ``). All other Markdown formatting (headers, lists, links) remains unchanged.
7. Are there any security concerns with this calculator?
The calculator uses JavaScript's eval() in a controlled way, only evaluating mathematical expressions. It's safe for mathematical operations but shouldn't be used with untrusted user input in a public-facing application.
8. How do I represent exponents?
Use the caret symbol ^. For example, $$ 2^10 $$ calculates 2 to the power of 10 (1024). For scientific notation, write $$ 1.5 * 10^6 $$.
9. Can I calculate percentages?
Yes, but remember to convert percentages to decimals. For example, $$ 200 * 0.15 $$ calculates 15% of 200 (result: 30).
10. What's the difference between log() and ln()?
log() is base-10 logarithm, while ln() is natural logarithm (base e). For example, `log(100)` = 2, while `ln(100)` ≈ 4.60517.
