Scratchpad

Name your figures, write the working, and calculate when you’re ready.

Your working

Input

Separate declarations with semicolons. End with an expression for a result. Enter starts a new line; Shift Enter calculates.

Result

Suffixed

Your result will appear here after you calculate.

Named bindings

0 defined

Keep track of the figures in your calculation.

rent = $1,850; gives a figure a name you can reuse.

Syntax & examples

Figures & names

$1,250.50, 2.5k, 3M, 1b, 1t

income = $1k;
tax rate = 0.25;
income * (1 - tax rate)

Names can contain spaces. A # starts a comment.

Arithmetic & functions

+ - * / ^ % with () [] {} grouping. % means remainder; write 5% as 0.05.

log lg ln sqrt abs floor ceil fact inv

Constants: e pi phi.

sqrt(3 ^ 2 + 4 ^ 2)

Sums & products

sum_i(i ^ 2, 1, 10)

prod_y(1.05, 1, 5)

Both bounds are inclusive whole numbers. The index belongs to the first argument. Use ungrouped figures for bounds.

Undefined arithmetic is shown as Undefined. Results use floating-point arithmetic.

Nested sums & products

Deposit $5,000 at the start of each of five years. Each deposit grows through the remaining years, with the rate rising from 3% by half a percentage point each year.

The sum’s local index t selects the deposit year and supplies the product’s starting bound. The product’s local index y selects each growth year and exists only inside that product’s first argument.

Result: 28,429.910985.

# Five deposits, each growing from its own year
deposit = $5k;
sum_t(
  deposit * prod_y(1.03 + 0.005 * (y - 1), t, 5),
  1, 5
)