How to use Notepad

Variables, units, currencies, percentages — with examples for each.

Last updated 1 day ago

Notepad

Write your calculations as plain text. Every line is worked out as you type it, with the result shown on the right.

rent = 256 + 128 384 utilities = 85 85 rent + utilities 469

Unit Conversion

Use in (also to, as) to convert one unit into another. Units are stripped from the expression automatically, so you can do maths with them.

20 ml in tsp 100 USD in EUR 25 cm * 6 price in USD + 4

Multi-word unit names work too: tea spoons, nautical mile, square meter.

Unit names are localised — if the app is set to German, 20 ml in Teelöffel works as well.

Currency

Use ISO 4217 codes (USD, EUR, GBP, JPY…), common symbols ($, €, £, ¥), or localised names. Rates update automatically and are cached for offline use.

$9 + 3 100 USD in EUR 4 GBP in JPY

Note: only the first currency symbol in a line is recognised. Write $9 + $3 as 9 + 3 USD instead.

Operations

Symbols and words both work.

	OperationHow to write it
Addition	`+`, `plus`, `and`, `with`
Subtraction	`-`, `minus`, `subtract`, `without`, `less`
Multiplication	`*`, `×`, `times`, `multiplied by`, `mul`
Division	`/`, `÷`, `divide`, `divide by`, `divided by`
Exponent	`^`
Modulo	`mod(10, 3)`

Word operators need spaces around them, so minutes is not read as minus.

8 times 9 20 divided by 4 2^10

Expressions stack, and parentheses next to each other multiply:

1 meter 20 cm 120 cm 6 (3) 18

Numbers

Decimal, binary (0b), octal (0o) and hexadecimal (0x).

0b110111011 443 0o1435343 408291 0x1F 31

Scales

Short forms for large numbers. One-letter scales are case-sensitive — M is million, while m is reserved for metres.

2k 2,000 3M 3,000,000 1.5B 1,500,000,000 2 thousand 2,000

Also million, billion, trillion.

Percentage

		OperationExampleResult
Percentage value	`20% of 100`	20
Adding a percentage	`5% on 30`	31.5
Subtracting a percentage	`6% off 40`	37.6
Relative percentage	`100 - 40%`	60
Value by percent part	`5% of what is 6`	120
Standalone	`8%`	0.08

In an addition or subtraction, a percentage is taken relative to the left side — 100 - 40% is 60, not 99.6.

Variables

Declare with = (or :) and reuse them anywhere below.

price = 10 fee = 8% price * 3

Variable names can use letters from any supported language — rent, 房租, 家賃, цена all work. They cannot start with a number or contain spaces.

Note: a variable stores the calculated number, not the expression. fee = 8% stores 0.08, so 40 + fee is 40.08. For a relative percentage, use fee on 40 instead.

Previous Result

prev (or last) refers to the line above.

20 prev + 5 25

Sum and Average

sum (or total) adds every non-assignment line above, back to the last blank line. avg (average, mean) does the same for the average. Also available: count, min, max.

10 15 sum 25

A blank line starts a new block, so each section can have its own total.

Constants and Functions

pi and e are built in.

		DescriptionFunctionExample
Square root	`sqrt`	`sqrt(16)`
Cube root	`cbrt`	`cbrt(8)`
Absolute value	`abs`	`abs(-4)`
Logarithm	`log`	`log(10)`
Base-2 / base-10 log	`log2`, `log10`	`log2(8)`
Natural logarithm	`ln`	`ln(3)`
Factorial	`!`	`5!`
Rounding	`round`, `ceil`, `floor`	`round(3.45)`
Trigonometry	`sin`, `cos`, `tan`	`sin(45)`
Inverse	`asin`, `acos`, `atan`	`asin(0.5)`
Hyperbolic	`sinh`, `cosh`, `tanh`	`sinh(3)`
Inverse hyperbolic	`asinh`, `acosh`, `atanh`	`asinh(3)`
Modulo	`mod`	`mod(10, 3)`

Trigonometric functions take radians by default. The Scientific page has a Rad/Deg toggle that also applies here.

Formatting

	SyntaxEffect
`# text`	Comment — the whole line is ignored
`// text`	Comment — same as above
`Label: 10 + 5`	The label is ignored, the expression is calculated
blank line	Starts a new block for `sum` / `avg`

# Monthly costs rent = 1200 utilities = 85 Total: rent + utilities

Units

	CategoryExamples
Currency	30+ currencies with live rates
Length	mm, cm, m, km, inch, foot, yard, mile, nautical mile, light-year…
Weight	mg, g, kg, tonne, ounce, pound, stone
Temperature	celsius, fahrenheit, kelvin
Area	cm², m², km², hectare, acre, square foot…
Volume	ml, l, m³, teaspoon, tablespoon, cup, pint, quart, gallon
Speed	m/s, km/h, mph, knot
Data	bit, byte, KB, MB, GB, TB, and the kibi- forms
Duration	ms, second, minute, hour, day, week, year
Pressure	hPa, kPa, bar, psi, mmHg
Power	watt, kilowatt, horsepower
Energy	joule, calorie, kWh
Force	newton, pound-force
Angle	degree, radian, gradian, arcminute, arcsecond
Fuel	L/100km, mpg, km/L

123 units across 15 categories. Names and abbreviations are localised in every supported language.

Multiple Notes

Tap the list icon to switch between notes or create a new one. The title comes from the first non-empty line, so you don't need to name them.

Not supported

These appear in similar apps but are not available here:

Date and time calculations — now, next friday + 2 weeks, time zones
Bitwise operations — &, |, xor, <<, >>
CSS units — px, pt, em
Cryptocurrencies
Inline comments — 10 + 5 "note" (use # on its own line instead)
Scientific notation formatting — 5300 in sci