❤️

Target Heart Rate Calculator

Calculate target heart rate zones for fat burning and cardio training.

Health & Fitness

🎖️

Army Body Fat Calculator

Calculate body fat percentage using the US Army tape method.

Health & Fitness

🏃

Pace Calculator

Calculate running pace, finish time, or distance for any race.

Health & Fitness

🔢

Rounding Calculator

Round numbers to any decimal place, significant figures, or to the nearest integer, ten, hundred, etc.

Math Calculators

📦

Surface Area Calculator

Calculate the surface area of 3D shapes: cube, sphere, cylinder, cone, and rectangular prism.

Math Calculators

📐

Pythagorean Theorem Calculator

Calculate the hypotenuse or a missing side of a right triangle using the Pythagorean theorem.

Math Calculators

📐

Distance Calculator

Calculate the distance between two points in 2D or 3D space using the distance formula.

Math Calculators

📊

Percent Error Calculator

Calculate percentage error between an experimental (measured) value and the true (accepted) value.

Math Calculators

📈

Slope Calculator

Calculate the slope, angle, distance, and equation of a line from two points.

Math Calculators

🔷

Tile Calculator

Calculate how many tiles you need for floors, walls, or backsplash with waste factor.

Other Calculators

🏠

Roofing Calculator

Calculate roofing materials needed — shingles, underlayment, and ridge cap for any roof size.

Other Calculators

🪨

Gravel Calculator

Calculate how much gravel, crushed stone, or pea gravel you need for driveways, paths, and landscaping.

Other Calculators