The right number. And why it&#x27;s right.

Finance

Compound Interest

Simulate investments with monthly contributions and watch your portfolio grow over time.

Finance

First Million

Find out how much to invest per month and for how long to reach 1 million.

Finance

Mortgage

Full mortgage simulation with constant-amortization (SAC) and constant-payment (Price) tables.

Finance

ROI

Calculate Return on Investment for campaigns, projects and businesses with clarity.

Finance

50-30-20 Budget

Split your net income automatically using the popular 50/30/20 budgeting model.

Health

BMI

Body Mass Index following the official WHO reference, with full result interpretation.

Health

Sleep Calendar

Find the best bedtimes and wake-up times based on 90-minute sleep cycles.

Cooking

Air Fryer Converter

Convert oven temperature and time to air fryer settings with precision.

Math

Integral Calculator

Solve definite and indefinite integrals with step-by-step work, chart and symbolic antiderivative.

Math

Derivative Calculator

Differentiate single- and multi-variable functions and see which rule applies at each step.

Math

Limit Calculator

Compute one-sided limits, limits at infinity and indeterminate forms with detailed explanation.

Math

Equation Solver

Solve linear, quadratic and systems of equations with exact and numerical solutions.

Math

Matrix Calculator

Add, multiply, invert and compute determinants of matrices with visible steps.

Math

Descriptive Statistics

Mean, median, standard deviation and quartiles from any data set.

Construction

Concrete Calculator

Calculate concrete volume and mix ratio for slabs, beams and columns, with waste factor.

Construction

Bricks Calculator

How many bricks your wall needs, with mortar and waste factor included.

Construction

Flooring Calculator

Estimate area, boxes and waste for tiles or porcelain flooring per room.

Construction

Paint Calculator

How many liters of paint per wall, with coats, coverage and doors discounted.