Free Online Calculator — Type Full Formulas with Parentheses
Type full math expressions instead of pressing buttons one at a time — free, no download. Supports + − * / and parentheses for complex formulas, with step-by-step results as you chain calculations.
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Tips
- Use parentheses to control operator precedence. Example:
(1 + 2) * 3→9 - Decimal calculations are supported. Example:
1.5 * 4→6 - Division results are displayed as decimals when applicable. Example:
10 / 3→3.333... - Entering multiple expressions in sequence shows intermediate results in order, letting you follow the calculation process.
FAQ
5 / 0 will return an error.
Side Note — History of the Calculator: From a 30-Ton Monster to the Smartphone
The world's first general-purpose electronic computer, ENIAC (completed 1945), weighed 30 tons, contained 18,000 vacuum tubes, and consumed 150 kW of power. A modern smartphone packs roughly one million times ENIAC's computing power into a circuit weighing just a few grams.
In the history of Japanese calculators, CASIO launched the world's first program-capable desktop calculator, the "001" (24 kg, ¥530,000), in 1964. The HP-35, released in 1972, was the first handheld scientific calculator, priced at $399 at the time (roughly equivalent to $2,800 today). It was said to have "killed the slide rule" and brought a revolution to engineers' pockets.
As of 2024, the record for computing the digits of π stands at 202 trillion 500 billion digits, achieved by a team including Google's Emma Haruka Iwao. The calculation required dozens of computers and several months of runtime.