SMALL TOOLS. CLEAR ANSWERS.

Make the numbers
make sense.

Everyday calculations, without a spreadsheet. Free to use, with the formulas explained and your inputs kept in your browser.

A segmented circular disk and square tiles representing parts of a whole

01 / EVERYDAY MATH

Percentage calculator

Find a percentage of any number.

Two groups of blocks at different heights connected by a change arrow

02 / EVERYDAY MATH

Percentage increase / decrease

Understand how much a value changed.

A blank price tag beside a separated portion of a tile representing savings

03 / EVERYDAY MATH

Discount calculator

Know what you save before you buy.

Layered slabs representing revenue, cost, and profit

04 / EVERYDAY MATH

Profit margin calculator

See your profit, margin, and markup.

Two clock faces connected by an arc representing elapsed time

05 / EVERYDAY MATH

Time duration calculator

Find the time between two moments.

Calendar squares and task tokens arranged beside an estimate tray

06 / EVERYDAY MATH

Reward earnings estimator

Explore the numbers behind your assumptions.

A funnel dividing reward tokens into fees and remaining payout

07 / EVERYDAY MATH

Reward cashout fee calculator

See your net payout after withdrawal fees.

A survey checklist, sand timer, and reward token

08 / EVERYDAY MATH

Survey hourly rate calculator

Include extra time to estimate your effective hourly rate.

No mystery math.

Each calculator includes its formula, a worked example, and important limits. Results are computational aids; financial decisions may need more context than a simple calculator can provide.

Read: profit margin vs. markup