🧮Calculators
Calculators cover finance, health, math, physics, engineering and everyday life: interest and loans, net salary, BMI, rule of three, conversions and more. Results are informational and educational — for important decisions, confirm with a professional and official sources.
2826 tools
Arcsine Calculator
Calculate the arcsine (arcsin) of a value and get the angle in degrees, radians and gradians. Domain: −1 to 1.
Arccosine Calculator
Calculate the arccosine (arccos) of a value and get the angle in degrees, radians and gradians. Domain: −1 to 1.
Arctangent Calculator
Calculate the arctangent (arctan) of a value and get the angle in degrees, radians and gradians. Accepts any real number.
Arccotangent Calculator
Calculate the arccotangent (arccot) of a value and get the angle in degrees, radians and gradians. Accepts any real number.
Arcsecant Calculator
Calculate the arcsecant (arcsec) of a value and get the angle in degrees, radians and gradians. Domain: |x| ≥ 1.
Arccosecant Calculator
Calculate the arccosecant (arccsc) of a value and get the angle in degrees, radians and gradians. Domain: |x| ≥ 1.
List Statistics
Calculate complete statistics for a list of numbers: sum, mean, median, mode, min, max, range and standard deviation.
Volume Calculator
Calculate the volume of geometric solids: cube, sphere, cylinder, cone, pyramid and rectangular prism. Instant result with the formula used.
Prime Number Checker
Check if a number is prime. Shows the prime factorization, the previous prime and the next prime. Instant result.
Combinations & Permutations
Calculate combinations C(n,k) and permutations P(n,k) with formulas and results for large numbers. Essential for combinatorics.
Fibonacci Sequence Generator
Generate the first N terms of the Fibonacci sequence. Shows the sequence, the nth term and the sum of all terms.
Weighted Average Calculator
Calculate the weighted average by entering values and weights in parallel lists. Ideal for calculating grades, scores and weighted metrics.
Speed, Distance & Time Calculator
Calculate speed, distance or time from the other two values. Supports km/h, m/s and mph. Ideal for sports, travel and physics.
Pythagorean Theorem Calculator
Calculate any side of a right triangle from the other two. Enter two sides and get the third with the formula a² + b² = c².
Root Calculator
Calculate the square root, cube root or nth root of any number. Result with 10 decimal places of precision.
Power Calculator
Calculate the power aⁿ of any base and exponent, including negatives and decimals. Shows the result in scientific notation when necessary.
Compound Interest Calculator
Calculate final amount, accumulated interest and return with compound interest. Supports initial capital, monthly contributions and monthly or annual rates.
Time Calculator
Add time durations in hours, minutes and seconds, and convert between milliseconds, seconds, minutes, hours and days.
Loan Calculator
Simulate loans and financing with a full amortization table. Calculate installments, total interest, and the real cost of credit.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) and Basal Metabolic Rate (BMR). Find out how many calories you need per day and your macro breakdown.
Function Animation
Visualize and animate mathematical functions f(x, t) in real time. The parameter t varies automatically — perfect for waves, trig functions and dynamic equations.
Parametric Curves
Animate and plot parametric curves defined by x(t) and y(t). Explore Lissajous, spirals, epicycloids, roses and other classic curves.
Aspect Ratio Calculator
Calculate the aspect ratio of any resolution (e.g. 1920×1080 = 16:9). Or calculate the missing dimension from a ratio and one side.
Tip Calculator
Calculate tip and split the bill among multiple people. Enter the total, tip percentage and number of people to see the per-person amount.
Fuel Cost Calculator
Calculate the fuel cost of a trip: enter distance in km, vehicle consumption (km/L) and price per liter. See liters needed, total cost and cost per km. All in the browser.
Sleep Cycle Calculator
Find the best time to sleep or wake up based on 90-minute sleep cycles. Waking between cycles helps you feel more rested. Allows 14 minutes to fall asleep. Everything in your browser.
Daily Water Intake Calculator
Calculate how many liters of water you should drink each day based on weight, physical activity and climate. Includes a goal in 250 ml glasses to track during the day. Everything in your browser.
Body Fat Calculator
Estimate your body fat percentage using the US Navy method (Hodgdon-Beckett). Enter height, neck, waist (and hip for women). Shows the fitness category. Everything in your browser.
Pet Age Calculator
Convert your dog or cat age into human years using the modern AVMA formula. Large and giant dogs age faster. Shows the pet life stage. Everything in your browser.
Caffeine Calculator
Calculate how long caffeine stays in your body. See the remaining amount after each half-life and when it is safe to sleep. Includes a sources table (coffee, tea, energy drinks, chocolate). Everything in your browser.
ROI Calculator
Calculate Return on Investment (ROI) from invested amount and gain. Shows ROI percent, net profit and annualized ROI. Useful for investment analysis. Everything in your browser.
CAGR Calculator
Calculate the Compound Annual Growth Rate (CAGR) between a start and end value over N years. Shows average annual growth of investments, revenue or KPIs. Everything in your browser.
Ohm’s Law Calculator
Calculate voltage (V), current (I), resistance (R) and power (P) using Ohm’s Law. Provide any two values and the calculator finds the other two. Useful for electronics and electrical work. Everything in your browser.
Resistor Color Code Calculator
Decode 4, 5 or 6 band resistors from their colors and see the value in ohms with tolerance. Also supports the reverse (value → colors). Useful for electronics. Everything in your browser.
Distance Between Coordinates
Calculate the great-circle distance between two GPS points using the Haversine formula. Result in km, miles and nautical miles, with bearing. Everything in your browser.
Markup and Margin Calculator
Compute sale price from cost + markup or margin (and vice versa). Also explains the difference between markup and margin — a common retail confusion. Everything in your browser.
Break-even Calculator
Find how many units you must sell to cover fixed and variable costs (break-even). Shows break-even in units and revenue, with contribution margin. Everything in your browser.
Math Expression Evaluator
Calculate math expressions as you type — sum, subtraction, multiplication, division, powers, square root, log, sin, cos, tan and parentheses. Shows the result. Everything in your browser.
ETA Calculator
Estimate the remaining time (ETA) for a task: from current progress, total and elapsed time, calculate how much is left and when it finishes. Useful for downloads, builds, processing. Everything in your browser.
BMR (Basal Metabolic Rate) Calculator
Compute Basal Metabolic Rate (BMR) — calories your body burns at rest — using Mifflin-St Jeor and Harris-Benedict formulas. Foundation for diet planning. Everything in your browser.
Parallel Resistor Calculator
Compute the equivalent resistance of up to 10 resistors in parallel (Req = 1 / Σ(1/Ri)). Also shows the series total for comparison. Everything in your browser.
Voltage Divider Calculator
Compute the output voltage of a voltage divider (Vout = Vin × R2 / (R1+R2)) and find resistor values for a desired output. Everything in your browser.
RC Time Constant Calculator
Compute the time constant τ = R × C of an RC circuit, cutoff frequency, and charge time to 63%, 95% and 99%. Useful for filters and timers. Everything in your browser.
Running Pace Calculator
Convert pace (min/km) to speed (km/h) and compute total time for 5K, 10K, half-marathon and marathon distances. Useful for runners. Everything in your browser.
Factorial Calculator
Compute n! (factorial) for any integer up to 170 (double precision limit). Above that, returns exact BigInt. Useful for combinatorics, probability and discrete math. Everything in your browser.
VO2 Max Calculator
Estimate your VO2 max (aerobic capacity) by 3 methods: 12-minute run (Cooper), 1.5-mile (Rockport) and resting heart rate. Everything in your browser.
Surface Area Calculator (3D)
Compute the surface area of cubes, rectangular prisms, spheres, cylinders, cones and pyramids. Shows the formula used. Everything in your browser.
LC Resonance Frequency Calculator
Compute the resonance frequency f = 1/(2π√(LC)) of an LC circuit. Useful for radio, filters and oscillators. Everything in your browser.
CPM Calculator
Compute CPM (Cost per Mille), impressions from budget+CPM, or total budget. Fundamental for paid media. Everything in your browser.
CPC and CPA Calculator
Compute CPC (Cost per Click) and CPA (Cost per Acquisition) from spend, clicks and conversions. Ideal for Google/Meta/TikTok Ads. Everything in your browser.
MRR and ARR Calculator
Compute MRR (Monthly Recurring Revenue) and ARR from monthly and annual subscriptions. Also shows ARPU. Key SaaS metrics. Everything in your browser.
Churn Rate Calculator
Compute churn rate (cancellation rate) and retention rate. Supports customer churn and revenue churn. Everything in your browser.
LTV / CAC Calculator
Compute Lifetime Value (LTV), Customer Acquisition Cost (CAC) and the LTV/CAC ratio. Healthy when ≥ 3. Everything in your browser.
Payback Calculator
Compute the payback time of an investment — how long until you recover the initial value given a periodic cash flow. Everything in your browser.
Z-Score Calculator
Compute the Z-score (standard score) of a value given population mean and standard deviation. Includes corresponding percentile. Everything in your browser.
Percentile Calculator
Compute the percentile of a value in a sample, or the value at a given percentile (p25, p50/median, p75, p99). Everything in your browser.
Basic Statistics Calculator
From a list of numbers, compute mean, median, mode, min, max, sum, standard deviation and variance (population and sample). Everything in your browser.
Blood Alcohol (BAC) Calculator
Estimate blood alcohol content (BAC) using the Widmark formula from drinks, weight, sex and time. Estimate only — do not drive after drinking. Everything in your browser.
Change Breakdown Calculator
Break a change amount into Brazilian banknotes and coins (R$ 200, 100, 50, 20, 10, 5, 2, 1, coins). Useful for cashiers and simulators. Everything in your browser.
Pizza Party Calculator
How many pizzas to order for X people? Estimate based on appetite (light/medium/large) and rodízio preference. Everything in your browser.