Basics
Type a calculation on any line and its result appears right beside it as a dimmed hint. Errors show inline in red. The total at the bottom sums all numeric results, and results are formatted with thousands separators.
| Operator | Function |
|---|
+ | Add |
- | Subtract |
* | Multiply |
/ | Divide |
^ | Power |
% | Remainder |
Many more functions and operators are available — see the mathjs documentation.
Tabs
Use the tabs at the top to keep separate worksheets. Every tab is saved automatically as you type.
- Switch — click a tab (or use
←/→ once focused, or Ctrl+Tab).
- Reorder — click and drag a tab to a new position.
- Rename — double-click the tab name.
- Close — click the
× (you'll be asked to confirm).
- Add — click the
+ tab.
- Export / Import — use the buttons in the Settings modal to download the active sheet as text or load one from a file.
Variables
Assign a value with = and reuse it on later lines. Use prev for the previous line's result, and sum/total/average/avg to aggregate the lines above until a blank line.
Functions
Store a function with f(x) = … and call it later. Numi-style aliases are available too: ln, fact, arcsin, arccos, arctan, root.
Lists
Write a list with square brackets. Lists are 1-indexed: n[1] is the first
element. Slice with a range, assign elements, do element-wise arithmetic, and combine lists with
the mathjs functions.
Sequences & iteration
A range start:end (with an optional :step) makes a list of numbers, and
calling a function with a range applies it to every element. Lists can be named and indexed like
any other variable.
Percentages
Use of, on and off with % for percentage math.
Operators & scales
Word operators and number scales work naturally.
Unit conversion
Convert units with to or in. CSS units are supported too: px, em and point.
| Base |
Unit |
| Length |
meter (m), inch (in), foot (ft), yard (yd), mile (mi), link (li), rod (rd), chain (ch), angstrom, mil |
Surface
area |
m2, sqin, sqft, sqyd, sqmi, sqrd, sqch, sqmil, acre, hectare |
| Volume |
m3, litre (l, L, lt, liter), cc, cuin, cuft, cuyd, teaspoon, tablespoon |
Liquid
volume |
minim (min), fluiddram (fldr), fluidounce (floz), gill (gi), cup (cp), pint (pt), quart (qt), gallon (gal), beerbarrel (bbl), oilbarrel (obl), hogshead, drop (gtt) |
| Angles |
rad (radian), deg (degree), grad (gradian), cycle, arcsec (arcsecond), arcmin (arcminute) |
| Time |
second (s, secs, seconds), minute (mins, minutes), hour (h, hr, hrs, hours), day (days), week (weeks), month (months), year (years), decade (decades), century (centuries), millennium (millennia) |
| Frequency |
hertz (Hz) |
| Mass |
gram(g), tonne, ton, grain (gr), dram (dr), ounce (oz), poundmass (lbm, lb, lbs), hundredweight (cwt), stick, stone |
Electric
current |
ampere (A) |
| Temperature |
kelvin (K), celsius (degC), fahrenheit (degF), rankine (degR) |
Amount
of
substance |
mole (mol) |
Luminous
intensity |
candela (cd) |
| Force |
newton (N), dyne (dyn), poundforce (lbf), kip |
| Energy |
joule (J), erg, Wh, BTU, electronvolt (eV) |
| Power |
watt (W), hp |
| Pressure |
Pa, psi, atm, torr, bar, mmHg, mmH2O, cmH2O |
Electricity
and
magnetism |
ampere (A), coulomb (C), watt (W), volt (V), ohm, farad (F), weber (Wb), tesla (T), henry (H), siemens (S), electronvolt (eV) |
| Binary |
bits (b), bytes (B) |
See the mathjs units reference for the full list.
Currency conversion
Convert between currencies using 3-letter ISO codes or symbols. Rates come from the European Central Bank (via frankfurter.dev) and are cached locally for offline use.
Supported codes: BRL, CAD, CHF, CNY, CZK, DKK, EUR, GBP, HKD, HUF, IDR, ILS, INR, ISK, JPY, KRW, MXN, MYR, NOK, NZD, PHP, PLN, RON, SEK, SGD, THB, TRY, USD, ZAR.
Dates
Convert unix timestamps with fromunix, get the current time with unix(), and use date units directly.
Shortcuts & files
The active sheet can be exported and imported from the Settings modal or with the shortcuts below.
| Shortcut | Action |
|---|
⌘Z | Undo the last change in the tab |
⇧⌘Z | Redo |
Ctrl+Tab
Ctrl+⇧Tab | Next / previous tab |
⌘1…9
Ctrl+1…9 | Jump to the nth tab |
⌘F | Find & replace in the active sheet |
⇧⌘C | Copy the current line's result |
⇧⌘E | Export the active sheet |
⇧⌘I | Import a sheet |
⇧⌘⌫ | Clear the active sheet |