Does the math and shows its work.
Most calculators hand you an answer and forget it. 1+1 keeps a running tape of every step — tap any line to bring it back.
See every step, not just the answer.
Tap any calculation to unfold it into clean, numbered steps — every operation, in the right order. Hit Use to drop a past answer straight back into the keypad.
Keep separate calculations side by side.
Open a tab per job and switch between them like browser tabs — each with its own running tape and a smart memory bank, where the values you reuse most bubble to the front.
Net, VAT, gross — solve any one from the others.
Enter any field and the other two derive instantly, with the rate prefilled for your region.
Compare every tip at once.
Enter the bill and split, then compare several tip rates side by side — each row showing the tip, total, and amount per person. Edit any percentage, or add your own.
Trig, logs, powers, and roots.
A full scientific calculator for the harder problems — sine, cosine, and tangent, logarithms, exponents, and roots, right alongside the everyday keys.
Plan what you spend.
Budget and trip-budget planners track your income and expenses by category — including a trip mode with travel, lodging, and per-day costs.
See how savings grow.
Enter a principal, rate, and term to project compound growth over time — with a growth curve and a year-by-year breakdown.
Your path to financial independence.
Estimate your FIRE number and how many years it takes to reach it — from your income, expenses, and savings rate.
Two calculators, side by side.
On iPad, run a full Split View and drag tabs between panes.
No ads. No tracking.
Just a fast, honest calculator.