Scientific calculator with unit converter: sine, logs, powers, units
Type an expression such as sin(45) + sqrt(2), or build it with the keys, and see the result while you type. The calculator handles powers, roots, logarithms and trigonometry in degrees or radians, and the second tab converts 53 units.
Opens without an account, with no daily limit.
- 11 functions and 2 constantssin, cos, tan, log, ln, sqrt and more
- Degrees or radiansone switch
- 53 unitsin 8 categories
- Live resultas you type
What a scientific calculator online is
A scientific calculator online is a calculator that goes beyond the four operations: it handles powers, roots, logarithms and trigonometric functions in degrees or radians. This one from EduFacturing opens in the browser, free and with no account.
Next to it sits a unit converter. You write the expression on one line, for example (3 + 4) * 2^3, and the calculations run in your browser.
What it calculates: expressions, angles, logs, units
Calculates expressions with brackets, powers and roots
You type + - * / ^ and brackets: (3 + 4) * 2^3 is 56. Brackets come first, then ^, then * and /, then + and -. A power is worked from right to left: 2^3^2 is 512.
Calculates sine, cosine and tangent in degrees or radians
The default is degrees: sin(30) is 0.5. In Radians (RAD) the same angle is sin(pi/6), and tan(30) gives −6.405 because 30 is now in radians.
Calculates logarithms and powers of e
log(100) is 2, ln(e) is 1, exp(1) is 2.718281828. The constants pi and e are written in lower case. A logarithm with another base: ln(8) / ln(2) is 3.
Converts 53 units in 8 categories
You pick a category, a number, From and To. The table on the right shows the same number in every unit of the category, and the swap button flips the two units.
When you need a scientific calculator and a converter
You need a scientific calculator when an ordinary one runs out: angles, logarithms and foreign units.
A physics or math problem
A student checks a result with a sine, a logarithm or a root and picks degrees or radians to match the problem.
A slope or an angle in the workshop
The slope of a 30° angle is tan(30), about 0.577. An angle from a ratio of sides: atan(1) is 45°.
Sizes from a foreign drawing
Inches to millimeters: 1 in is 25.4 mm. Mile, foot and yard are in the Length category, the gallon is under Volume.
Temperature and data
212 °F is 100 °C, and 300 K is 26.85 °C. In the converter, 1 TB is 1024 GB.
How an expression is calculated and units are converted
An expression goes through three steps and is never run as a program.
Reading
The text is split into numbers, operations, brackets and function names. An unknown character or function gives an error message.
Ordering by priority
Dijkstra's shunting-yard algorithm puts the operations in reverse Polish notation: 3 + 4 * 2 becomes 3 4 2 * +.
Calculating and display
Numbers pile up on a stack and each operation takes what it needs from the top. The result has up to 10 significant digits: 0.1 + 0.2 shows as 0.3.
| Applies to | Formula | Meaning |
|---|---|---|
| Angles | sin(x°) = sin(x · π / 180) | in degrees mode the angle first becomes radians; asin, acos and atan return degrees |
| Units | number · factor(From) / factor(To) | the factor is to a base unit: m, kg, m², m³, m/s, s or B |
| Temperature | °F = °C · 9/5 + 32 ; K = °C + 273.15 | through Celsius, both ways |
| Data | 1 KB = 1024 B | binary system: 1 GB = 1024 MB |
Reference
Unit categories and functions
| Parameter | Value | Unit |
|---|---|---|
| Length | m, km, cm, mm, um, nm, in, ft, yd, mile, nmi | 11 units |
| Mass | kg, g, mg, t, lb, oz | 6 units |
| Temperature | C, F, K | 3 units |
| Area | m2, km2, cm2, mm2, ha, acre, ft2, in2 | 8 units |
| Volume | m3, L, mL, cm3, mm3, gal, qt, pt, fl oz, ft3, in3 | 11 units |
| Speed | m/s, km/h, mph, knot, ft/s | 5 units |
| Mathematical functions | sin, cos, tan, asin, acos, atan, log, ln, sqrt, exp, abs | 11 functions |
Eight categories with over 50 units; every value passes through the SI base unit
Degrees or radians and a history of calculations
The angle mode is always visible
The Degrees (DEG) and Radians (RAD) switch sits above the field, and the result area says "mode: degrees" or "mode: radians".
The result comes before the equals key
While you type, the result shows faded, next to the note "press = to save".
An old expression comes back with one click
The history keeps the last 10 calculations, and a click on an expression returns it to the field.
It does not plot graphs or solve equations, and it has no factorial, fractions, memory or complex numbers. Multiplication is not implied: write 2*pi, not 2pi. The decimal mark is a point or a comma, and a comma between digits is always decimal: 1,000 is one, not a thousand. A form like 1e5 gives an error. The characters −, × and ÷ are accepted as minus, multiply and divide.
A minus before a number is applied after the power: -3^2 gives −9, the same as -(3^2), and (-3)^2 gives 9. The % key only divides by 100: 200 + 10 % is 200.1. The history, the expression and the chosen units stay when you switch tabs, but are not kept after the page is reloaded. The converter has no pressure, energy or angles, and data units are binary only. The square root or logarithm of a negative number and 0/0 show “Not a number (NaN)”, 1/0 shows “∞” and ln(0) shows “-∞”.
Questions about sine, logarithms and units
How to calculate sine on a calculator?
Type sin( and the angle, for example sin(30), and press equals. In Degrees (DEG) mode you get 0.5, and in Radians (RAD) the same angle is sin(pi/6).
How to switch between degrees and radians on a calculator?
Use the Degrees (DEG) and Radians (RAD) switch above the expression field. It applies to sin, cos, tan, asin, acos and atan, and the result area names the active mode.
What is the difference between log and ln?
log is base 10: log(100) is 2. ln is the natural logarithm, base e: ln(e) is 1. For another base divide: ln(8) / ln(2) is 3.
How to convert Fahrenheit to Celsius?
In Unit converter choose Temperature, From Fahrenheit, To Celsius, and enter the number. 212 °F is 100 °C.
How many megabytes are in a gigabyte?
In this converter, 1024: it works in binary units, 1 GB = 1024 MB. It has no decimal system with 1000.
What is a scientific calculator?
A calculator with functions beyond the four operations: powers, roots, logarithms and trigonometry.
Is the scientific calculator free?
Yes. It opens without an account and with no daily limit.
The scientific calculator is free. Pro opens the rest
Pro costs 15 EUR a month and opens 45 Pro tools.
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Calculate an expression or convert a unit
Opens without an account, with no daily limit.