🧮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.
2904 tools
Rent Adjustment Calculator
Compute annual rent adjustment by IGP-M or IPCA accumulated in the last 12 months (manually configurable).
Pregnancy Calculator
Compute estimated due date (EDD), gestational age and trimester from the last menstrual period (LMP).
Fertile Period Calculator
Compute fertile window and ovulation day from the first day of the last cycle and the average cycle length.
Heart Rate Calculator
Compute max HR (220 − age) and training zones (fat burn, aerobic, anaerobic) using the Karvonen method.
BBQ Calculator
Compute quantities of meat, drinks, bread, charcoal and side dishes for a BBQ based on adults, kids and duration.
First Million Calculator
Compute how long it takes to reach R$1,000,000 given a monthly contribution and compound interest rate.
Financing Simulator
Simulate financing (Price or SAC tables) with value, term and rate. Shows installments, total paid and interest.
Loan Simulator
Simulate personal loan (Price table) computing monthly installments, total paid and effective cost.
Savings Simulator
Simulate Brazilian savings yield over a period with initial and monthly contributions. Uses 0.5% + TR estimate.
MEI DAS Tax Calculator (Brazil)
2024 fixed monthly slip by activity in Brazil's microentrepreneur regime: R$72.60 commerce, R$76.60 service, R$77.60 both, plus the R$81,000 cap check.
Household Employee Salary Calculator
Computes total employer cost for a Brazilian household employee (eSocial): employee/employer INSS, FGTS, accident insurance and severance provision.
Unemployment Benefit Calculator
Estimates Brazilian unemployment benefit installments based on the average of the last 3 salaries (2024 table).
Hours Calculator
Add and subtract hours and minutes. Compute worked time from entry, exit and breaks.
Overtime Calculator
Compute overtime pay with 50% (weekday) and 100% (Sunday/holiday) surcharges over the normal hour value.
INSS Calculator
Calculate Brazilian INSS payroll deduction using the 2024 progressive table (7.5% to 14%).
FGTS Calculator
Calculate monthly FGTS deposit (8% of gross salary) and accumulated balance over a period.
13th Salary Calculator
Calculate the Brazilian 13th salary, proportional to months worked, with INSS and income-tax deductions on the second installment.
Net Salary Calculator
Compute net salary from gross by deducting Brazilian INSS and IRRF (2024 tables). Considers dependents.
Fraction Calculator
Add, subtract, multiply and divide fractions. Simplifies to lowest terms and converts to decimal.
Proportion Calculator
Solves proportions (rule of three) with up to 4 terms: A is to B as C is to X. Computes the unknown.
Simple Interest Calculator
Compute simple interest with J = C × i × t. Auto-adjusts time unit (days, months, years).
VAT Calculator
Compute VAT in different rates. Useful for Portugal and other Portuguese-speaking countries.
BPM Tap Calculator
Compute BPM (beats per minute) by tapping Space in rhythm. Useful for musicians and DJs.
Roman Numerals Converter
Convert Arabic numbers to Roman numerals and vice versa. Supports values from 1 to 3999. Instant bidirectional conversion.
GCD Calculator
Calculate the Greatest Common Divisor (GCD) of two or more numbers using the Euclidean algorithm. Instant result.
LCM Calculator
Calculate the Least Common Multiple (LCM) of two or more numbers. Instant result in the browser.
Percentage Calculator
Calculate percentages in three ways: X% of Y, X is what % of Y, and X increased or decreased by Y%. Instant result.
Rule of Three Calculator
Solve a simple rule of three online. Enter three values and automatically calculate the fourth.
Modulo Calculator
Calculate the remainder of integer division (modulo) between two numbers. Instant result in the browser.
Prime Factorization
Decompose any number into its prime factors. Instant result with the complete factorization.
Circle Area Calculator
Calculate the area of a circle from its radius. Formula: A = π × r². Instant result in the browser.
Square Area Calculator
Calculate the area of a square from its side. Formula: A = l². Instant result in the browser.
Rectangle Area Calculator
Calculate the area of a rectangle from its base and height. Formula: A = b × h. Instant result.
Triangle Area Calculator
Calculate the area of a triangle from its base and height. Formula: A = (b × h) / 2. Instant result.
Pentagon Area Calculator
Calculate the area of a regular pentagon from its side length. Instant result in the browser.
Hexagon Area Calculator
Calculate the area of a regular hexagon from its side length. Instant result in the browser.
Regular Polygon Area Calculator
Calculate the area of any regular polygon by entering the number of sides and side length.
Rhombus Area Calculator
Calculate the area of a rhombus from its major and minor diagonals. Formula: A = (D × d) / 2.
Trapezoid Area Calculator
Calculate the area of a trapezoid from its parallel bases and height. Formula: A = ((B + b) × h) / 2.
Parallelogram Area Calculator
Calculate the area of a parallelogram from its base and height. Formula: A = b × h. Instant result.
Ellipse Area Calculator
Calculate the area of an ellipse from its semi-major and semi-minor axes. Formula: A = π × a × b.
Annulus Area Calculator
Calculate the area of a circular ring (annulus) from its outer and inner radii. Formula: A = π × (R² − r²).
Circular Sector Area Calculator
Calculate the area of a circular sector from its radius and central angle in degrees. Formula: A = (π × r² × θ) / 360.
Severance Pay Calculator (Brazil)
Calculate Brazilian employment termination amounts: salary balance, proportional vacation, 13th salary, FGTS and dismissal fine.
Vacation Pay Calculator (Brazil)
Calculate vacation pay with the constitutional third per Brazilian labor law (CLT). Enter gross salary and vacation days to get the estimated net amount.
BMI Calculator
Calculate your Body Mass Index (BMI) and find your classification according to WHO. Enter weight and height for an instant result.
Ethanol vs Gasoline Calculator
Find out which fuel is more cost-effective: ethanol or gasoline. Enter the prices and see which is better for your flex-fuel car.
Interest Rate Calculator
Calculate simple and compound interest. Enter the principal, rate and period to get the interest and final amount.
Discount Calculator
Calculate the discount amount and final price from the original price and discount percentage. Instant result.
Linear Equation Solver
Solve first-degree equations (ax + b = 0) instantly. Enter the coefficients and see the value of x with step-by-step solution.
Quadratic Equation Solver
Solve quadratic equations (ax² + bx + c = 0) with the quadratic formula. Shows the discriminant Δ and real roots.
Arithmetic Progression
Calculate the general term and sum of an Arithmetic Progression. Enter the first term, common difference and number of terms.
Geometric Progression
Calculate the general term and sum of a Geometric Progression. Enter the first term, ratio and number of terms.
Multiplication Table
Generate the multiplication table for any number. See the multiplication line by line up to any multiplier.
Sine Calculator
Calculate the sine of an angle in degrees, radians or gradians. Precise result with up to 10 significant digits.
Cosine Calculator
Calculate the cosine of an angle in degrees, radians or gradians. Precise result with up to 10 significant digits.
Tangent Calculator
Calculate the tangent of an angle in degrees, radians or gradians. Shows "Undefined" when the tangent does not exist.
Cotangent Calculator
Calculate the cotangent of an angle in degrees, radians or gradians. Shows "Undefined" when the cotangent does not exist.
Secant Calculator
Calculate the secant of an angle in degrees, radians or gradians. The secant is the reciprocal of the cosine.
Cosecant Calculator
Calculate the cosecant of an angle in degrees, radians or gradians. The cosecant is the reciprocal of the sine.