Free Online Scientific Calculator - sin cos tan log sqrt

A No, factorial is only defined for non-negative integers. So 0! = 1, 5! = 120, but (-5)! won't work here. The calculator will show an error if you try. This is a common point of confusion, even among students taking statistics or probability courses. If you're computing permutations or combinations, double-check that your n and r values are both positive integers before hitting the factorial button.

A This calculator stores history in your browser's temporary memory, not on a server. So refreshing or closing the tab wipes it clean. If you need to keep those results, copy them before navigating away. For tax season or any financial reports, jot down the key numbers in a separate file. We're working on session persistence, but it's not available yet.

A Yes, use the power (^) key for compound interest. Enter P(1+r/n)^(n*t) where P is your starting amount, r the annual rate, n the compounding frequency, and t the years. For $10,000 at 5% compounded monthly over 10 years, type 10000*(1+0.05/12)^(12*10). You'll get $16,470.09. The history feature lets you compare different rates side by side.

A The 'sin' button calculates the sine of an angle you input. 'sin⁻¹' does the reverse — it finds the angle whose sine equals your number. For example, sin(30°) gives you 0.5. But sin⁻¹(0.5) returns 30°. This trips up students all the time when they're checking homework answers. Make sure your angle mode (degrees vs radians) is set correctly before using either function. The mode toggle is in the top menu.

A Most online scientific calculators cap out around 10^308. Go beyond that and you'll get 'Infinity' or an error. This is a hardware limitation, not a bug. For instance, computing 200! (factorial of 200) returns a number with 375 digits. Our tool handles that fine. But try 1000! and you'll hit the wall. If you're working with astronomical figures like Avogadro's constant (6.02e23), you're safe. For galaxy-sized numbers, you'll need specialized software.

A Absolutely. Modulo gives you the remainder after division, which pops up everywhere. Say you're converting minutes to hours: 347 % 60 gives you 47 leftover minutes. Or you're building a repeating pattern and need to know where you are in the cycle. It also helps with currency conversions when you need to split change. For example, 100 % 7 = 2, so if you distribute $100 among 7 people, $2 remains. Try it with larger numbers and you'll spot the pattern fast.

A That button isn't a simple divide-by-100 shortcut. It performs percentage based on the current expression context. For example, type 200 + 10% and you'll get 220, not 210. The calculator treats 10% as 10% of 200, so it adds 20. That catches people off guard constantly, especially when they're doing quick tip math. If you just need 10% of 200 as a standalone value, type 200 × 0.1 instead, or use the divide key clearly. This behavior has tripped up many students I've worked with.

A Logarithms undo exponents. If your textbook asks when a radioactive substance decays to 10 milligrams from 50 milligrams, you need the natural log function. Type ln(10/50) and divide by your decay constant. This saves you from guessing values manually. Many students waste time doing trial and error when the 'ln' button solves it instantly.

A Yes, retirees managing fixed-income withdrawals find the power function indispensable for projections. Say you have $500,000 saved and need to calculate year-end totals after a 4% annual distribution. Type 500000 * (1 - 0.04) and hit enter for your remaining balance. You can chain these operations using the history pane to map out a ten-year retirement timeline. Always check your local tax bracket before finalizing those withdrawal rates.

A Type your math using physical keyboard keys instead of clicking every single icon. For instance, typing '5*4+3' on your keyboard solves the expression instantly. This trick cuts calculation time in half for fast-paced homework sessions. Mouse clicking still works if you prefer touchscreen devices. Try mixing both inputs during long problem sets.