1+1 Calculator

See every step on an always-on tape, run calculators in tabs, go scientific, split the bill with tip, and sort VAT or GST in seconds — no ads, no tracking.

1+1 Calculator does the math and shows its work.

Most calculators give you only an answer. This one keeps an always-on tape of your calculations on the main screen — every expression and result, with correct operator precedence — so you can double-check your work and reuse earlier answers with a tap.

Built for everyday math:

An always-on history tape, so you see your steps and not just the answer Multiple calculators in tabs to keep separate calculations side by side A scientific calculator with trig, logs, powers, and roots for the harder problems A VAT / GST calculator: enter net, VAT, or gross and get the other two instantly, with the rate prefilled for your region A tip & split calculator: enter the bill, pick a tip, and split the check across the table A memory bank to copy and reuse values

Plus money tools that look ahead:

A budget and trip-budget planner to keep track of what you spend An interest calculator to see how savings grow over time A FIRE calculator to estimate your path to financial independence

A clean, modern design for iPhone and iPad. No ads. No tracking. Just a fast, honest calculator.