Free, nothing to install, no sign-up. Works on your phone and on your computer.
A free scientific calculator that works on your phone and on your computer, with nothing to install and no sign-up. It has what you need for school and early university: powers and roots, logarithms, the trigonometric functions with their inverses, combinations and permutations, memory and the degrees/radians switch. It runs inside your browser, so once the page has loaded you do not need a connection.
This is the big difference from the basic calculator in the drawer. Type 2 + 3 × 4 and a basic one works along as you press and answers 20; this one answers 14, which is right, because multiplication comes before addition. The order is: brackets first, then powers and roots, then multiply and divide, and addition and subtraction last.
The sine of 30 is 0.5 in degrees but −0.988 in radians, and the calculator has no way of knowing which you meant. It is the mistake that costs more marks in exams than any other. Check the switch BEFORE you start: degrees for geometry angles, radians for calculus.
Several keys keep a second operation behind them, usually the inverse or the sibling of the one you can see: behind the square root is the cube root, behind x to the power of y is the yth root, and behind sin, cos and tan are their inverses — the ones written with the −1 above, which find the angle when what you know is the ratio. And nCr is combinations, with nPr behind it: nCr counts groups where order does not matter and nPr counts arrangements where it does, which is the distinction that always comes up.
M+ adds whatever is on the display to the memory, MR brings it back and MC clears it. It saves you jotting intermediate results on paper: work out one part, store it, work out another and add it on. And it pays to press MC before starting something new, because a stale memory left in place is exactly how you get an answer that does not add up with no obvious reason.
Before trusting a number, estimate the size of it in your head: 48 times 52 has to land near 2,500, so 249.6 or 24,960 means a decimal point or a zero out of place. And in trigonometry there is a limit that never fails: the sine and cosine of any angle are always between −1 and 1. If you get 30, you have pressed the inverse by accident.
Because 14 is the right answer: multiplication happens before addition, so first 3 × 4 = 12 and then 2 + 12 = 14. Basic calculators give 20 because they operate as you press, ignoring the order. If you really do want the addition first, put it in brackets: (2 + 3) × 4 = 20.
Degrees for angles in shapes, triangles and geometry problems, which is the usual case at school. Radians for calculus: derivatives, integrals and anything with trigonometric functions inside. If the question writes the angle with a degree symbol, it is degrees.
log is the logarithm to base 10 and ln is the natural logarithm, to base e. Same idea, different base, and you convert between them by dividing. Physics and continuous growth use ln; scales like pH and decibels use log.
Once the page has loaded, yes: the whole calculator is inside your browser and it does not call out to anything. Nothing you type is stored anywhere either, and no account or email address is needed.
Written and checked by the Tutorio Lab editors · Who we are and how we are funded
Hecha por Tutorio Lab. Nada de lo que escribes sale de tu equipo: la calculadora funciona entera dentro de tu navegador.