CalcPlanet offers 725+ free online calculators and tools across finance, health, math, science, conversions, and everyday life. Use our BMI calculator, mortgage calculator, percentage calculator, loan EMI calculator, tip calculator, currency converter, salary to hourly converter, discount calculator, sales tax calculator, and hundreds more — all instant, mobile-friendly, and require no sign-up. Whether you need to calculate body mass index, monthly mortgage payments, percentage change, compound interest, calorie intake, unit conversions, or crypto prices, CalcPlanet provides accurate results with transparent formulas and step-by-step explanations. Our growing library of free calculators is trusted worldwide for finance planning, fitness tracking, academic study, engineering, cooking, travel, and small business. Explore curated guides, real-world examples, and formula references to learn how each calculation works. Browse popular categories: BMI calculator, percentage calculator, mortgage calculator, tools, all calculators, guides, formulas, finance, health, math, conversion, and about CalcPlanet. Free calculators, instant answers, no ads in core results, accurate every time.
A scientific calculator is essential for anyone working beyond basic arithmetic — students solving physics problems, engineers calculating circuit values, chemists converting moles, or data scientists running statistical tests. This free online scientific calculator provides every function you'd find on a TI-84 or Casio fx-991, right in your browser. No app downloads, no batteries, no cost — just…
## Available Functions The scientific calculator includes a complete set of mathematical functions organized into clear categories: **Trigonometry**: sin, cos, tan, and their inverses (asin, acos, atan). Switch between degree and radian mode depending on your problem. **Logarithms**: log (base 10) for engineering and chemistry, and ln (natural log, base e) for calculus and finance. **Powers & Roots**: x², x³, √x, ∛x, xʸ (any power), 10ˣ, eˣ. **Constants**: π (3.14159…) and e (2.71828…) — the two most important mathematical constants. **Utility**: 1/x (reciprocal), n! (factorial), % (percentage), and parentheses for controlling order of operations.
## Degrees vs. Radians The DEG/RAD toggle is critical for trigonometric calculations. **Degrees** are used in geometry, navigation, and everyday angle measurement (a right angle = 90°). **Radians** are the standard in calculus, physics, and engineering (a right angle = π/2 ≈ 1.5708 radians). Using the wrong mode is one of the most common errors in scientific calculations — always check before computing trig functions. Conversion: radians = degrees × (π/180). So 45° = 0.7854 rad, 180° = π rad, 360° = 2π rad.
## Common Scientific Calculations **Physics — Projectile Motion**: To find the horizontal distance of a projectile: d = (v² × sin(2θ)) / g. With v=20 m/s, θ=45°, g=9.81: d = (400 × sin(90°)) / 9.81 = 400/9.81 = 40.8 m. **Chemistry — pH Calculation**: pH = −log₁₀[H⁺]. For a solution with [H⁺] = 0.001 M: pH = −log(0.001) = 3. **Finance — Compound Interest**: A = P × e^(rt) for continuous compounding.
This tool is most valuable when you need a result to compare against something else: a quoted figure, a competing option, or a budget threshold. Accurate comparisons require accurate inputs and arithmetic — this calculator ensures both.
Many errors with this type of calculation stem from unit inconsistency: mixing metric and imperial, or mixing annual and monthly rates. Ensure all inputs use the same unit system before running the calculation.
A business owner spots that revenue grew from £180,000 last year to £213,400 this year. The calculator confirms the increase is 18.6% — a figure needed for the annual report and for comparing against the industry growth rate cited in the sector report.
Core Scientific Functions
sin(θ) cos(θ) tan(θ) | log₁₀(x) ln(x) | x² √x xʸ | n!
θ in degrees or radians. log = base 10. ln = natural log (base e ≈ 2.71828). x^y = x raised to the power y. n! = n factorial.
Find the hypotenuse of a right triangle with legs a=5 and b=12 using the Pythagorean theorem.
Result: Hypotenuse = 13 — confirmed by the 5-12-13 Pythagorean triple
Sin, cos, tan, asin, acos, atan, x², √, x³, ∛, log (base 10), ln (natural log), 10^x, e^x, x^y, π, e, 1/x, n!, %, and memory functions (M+, M−, MR, MC).
Both. Use the DEG/RAD toggle to switch modes. Degrees are standard for geometry; radians for calculus and physics.
log(x) is the common logarithm (base 10), used in engineering, chemistry (pH), and decibel calculations. ln(x) is the natural logarithm (base e ≈ 2.71828), used in calculus, compound interest, and population growth models.
Yes. The scientific calculator is fully responsive and optimized for smartphones and tablets. All buttons are touch-friendly and the display adjusts to screen size.
The scientific calculator follows standard mathematical order of operations (PEMDAS/BODMAS): Parentheses first, then Exponents, then Multiplication/Division, then Addition/Subtraction.
Free, fast, and easy. Use 722 calculators and 108 tools. No sign-up. Get instant results for math, money, health, and more.
By CalcPlanet Editorial · · According to our Editorial Standards and Formula Sources, every calculator is reviewed before publication.
CalcPlanet calculators are free, privacy-first, and formula-reviewed.
Editorial Standards · Formula Sources · Privacy · Terms · Contact
