Calculator guide

Getting started with Calculator

Calculator is a calculator you type into. It understands percentages, units, currencies, dates and times, and keeps a paper tape of what you worked out.

Open Calculator

Type a calculation

Type in Type a calculation and press Enter, or choose =. The answer shows under the line as you type. The keys under it insert brackets, powers, %, √, in, of, ans and the helpers.

Some things to try: 1200 + 20%, 20% of 150, 5 km in mi, 100 C in F, 17:00 - 08:15, 2026-12-25 - today in weeks, tax(200, 8), discount(200, 15) and markup(100, 25).

Names, tape and history

Give a value a name, such as price = 19.99, and use it in later lines: price * 3. Your names are listed under Variables.

Each answer goes on the Paper tape for this visit. History keeps up to 200 calculations on this device; search it and click one to use it again. Save to Files keeps a calculation as a file.

Convert and currencies

The Convert panel converts a value between units: pick the Category, From and To. For money, 100 USD in EUR uses a rate you saved under Exchange rates, or else a rate from Ledger.

When the answer is a date, Add to Calendar puts it in Calendar as an all-day event.

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