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German: Rechneronline | Italiano: Calcolare online | Contact & Privacy

# Rechneronline - Useful Calculators

Calculators, digital tools, for numerous applications, for private, business and school use. This is the English language version of the German Rechneronline. Rechner translates as calculators. Not every German page is translated, but most of them. Not all calculators are listed here, some topics contain much more.

Online calculators for:  | Physics & Chemistry | Economy | Time & Date | Household | Health & Body | Technics & IT | Cars & Traffic | Geography | Art

## Maths

Calculations of Geometrical Figures and Solids
Calculating with two-dimensional and three-dimensional geometric shapes.

Function Graphs
Plot graphs of math functions.

Linear Algebra
Matrix calculator for linear equations and for vectors in space.

Golden Ratio
Calculates the lengths for the golden ratio.

Statistics Calculator
Produces statistics on a data set.
Combinatorics
Formulas from combinatorics like Binomial Coefficient can be calculated.

Digit Sum
Finds the cross sum and iterated cross sum from one or more numbers or a whole text.

Data Set Calculator
Calculations with a data set of numbers: basic arithmetic operations, powers, logarithms, trigonometric functions.
Number Sieve
Random Numbers
Generates random numbers, evenly distributed, left-hand part, right-hand part or distributed bell-shaped.
Random Subset
Calculate the Slope
Calculates the gradient in degrees and percent, as well as the distances in length and height and the total distance.

Prime Factor Calculation
Find the prime factors of an integer.
Find Numbers with Common Divisors
Draw Angles
Drawing program for angles of certain sizes. Calculator for:

Calculate Logarithm
The logarithm of a value on any base can be calculated.

Pythagoras Calculator
Make calculations in the right triangle.

Number List Generator
Create a list of numbers with any start and end value and increment.
Count
Sum und Product
Calculate sum Σ and product Π with start and end value.

Trigonometric and Hyperbolic Functions
Derivative and Integral of Trigonometric and Hyperbolic Functions.

Dimensions: Ratios
Calculator for ratios for sizes with multiple dimensions: area (2D), space (3D) and fractals.

Fold a Rectangle
Calculate and draw the folding of a rectangle.
Wrapping Paper
Draw and Calculate a Straight Line
Calculator for the angle of inclination of a straight line and the intersection of two straight lines. The lines will be drawn.

Logarithmic Scale
Calculator for comparing two values, the size of which has been measured on a logarithmic scale.

Decimal Places of Irrational Numbers
Calculation of up to 2000 decimal places of the transcendent numbers π, e, φ, irrational roots, as well as their multiples.

Set Theory
A calculator for set theory. Two sets of numbers can be cut, merged, subtracted from one another, and sorted.

Contact Sphere - Obstacle
Calculator for the point at which a ball on a plane touches an obstacle of a certain height.
Fill Level Circle and Sphere
Draw Chart Diagrams
A simple drawing program for diagrams with up to 10 values: pie chart, bar chart and column chart.

Squaring the Circle
Calculator for the side length for a square and the radius for a circle when both have the same area.

Correlation and Significance
Calculator for the correlation coefficient for two characteristics and the significance.

Numerals Calculator
Transfer numbers into English numerals, which are numbers written down as words, like one, two, three and much larger ones.

Rounding
Multiple methods of rounding numbers: rounding, rounding up, rounding down, round with 5, round down with 5.

## Physics & Chemistry

Math and Physics Formulary
Collection of important formulas from the fields of mathematics and physics.

Convert Units of Measurement
Convert physical and technical dimensions of all kinds into one another.

Chemical Calculators
Various chemical calculations.

Air Pressure with Barometer
Convert the air pressure from different altitudes into one another, e.g. to calibrate a barometer.

Astronomy Calculator
Converts values for the stars and planets.
Calculator for the Electromagnetic Spectrum
Convert wavelength, frequency and energy into each other and display them on a scale.

Angular Diameter
Calculate the angle of vision or the apparent size of distant objects.

Multiply Temperatures
Correct calculation with Celsius and Fahrenheit.

Convert Volume Percent and Mass Percent
Calculator for converting volume percentages and mass percentages when the density of the mixed substances is known.

Doppler Effect
Calculation of the acoustic Doppler effect and simulation of tones, depending on the speed of the sound source and the listener.

g-Acceleration
Calculation of the g-force with linear acceleration or with constant speed in a curve.

Material Calculator
Calculator for estimating the volume, weight or mass, density or size of a body.

Everyday Physics
Tools for specific cases of measuring and calculating.

Liters in a Container
How many liters does a container of a certain size hold?

Distance of the Planets
Calculator for different sizes of planets, moon and sun.

Physical Quantities
Force, work and other quantities.

Calculate Field
Several calculators for the shape, size and extent of a field and for various units of measurement.

Size Comparison
Compares quantities with different units and reference quantities.

Atomic Collider
An online particle accelerator for simulating the collisions and decay of atomic nuclei. Simulation of fusion and different types of decay.

Calculates the snow load on a flat surface for different snow types.

Planck Units
Conversion of common physical units into Planck units.

## Economy

Important calculations for banking calculations and business studies.

Calculation of Percentage and Interests
Calculates percentages and interest rates.

Price Table Matrix Calculator
Calculator for a price matrix for 1, 2 or 3 products.

Sustainable Stocks
A list of sustainable stocks or shares, from environment and climate friendly companies, traded at an exchange.

Ratios of a Value
Allocation evenly or with a distribution key, determination of the rest.

Production - Amount and Time
Calculates the number of items produced in a period from one or more regular productions.

## Time & Date

Calendar Calculations
Calculate different calendar dates.

World Clock and Time Zones
The times in all countries and zones in the world.

Small calculators for adding / subtracting and multiplying / dividing times.

Zodiac Signs Calculator
This calculator determines the zodiac, the Chinese and Indian zodiac signs.

Year of Birth
Calculate the year of birth, the exact age or the time from a certain date.

Flight Time Calculator
Calculate the duration of a flight from take-off time, landing time and the time zones at the take-off point and landing point.
Regularity and Repetition
Many things happen several times in a certain period of time. Here it can be calculated how often these will then take place in any other period of time.

Calculator for the period from a date to a deadline.

## Household

Measurements of a Staircase
Calculator for dimensions, number of steps, step size, gradient ratio and angle of inclination.

Roof Calculator
Calculates the height, length or width of a roof from the angle of inclination.

Paper Size Calculator
Compare DIN A, B, C, D.

Candle Burn Time
Calculate how long a candle of a given size or weight can burn.
Mixed Wax Candles
Heating Power
calculated from room size and insulation.

## Health & Body

Health and Fitness Calculators
Calculate body mass index (BMI) and many other things about health.

Race Time Calculator
Calculator for times of athletic performance and the like. Distance, time and speed in different units.

When Will the Pack of Medication Run Out
Calculates how long a pack of medication lasts if taken regularly.
Cost of Smoking
Calculator for the money you pay over time for smoking or the money you save when you quit smoking.

## Technics & IT

Data Transfer Time
over USB or internet, their speed or size.

Word analysis
Calculates the number of words, characters, digits and single letters in a text.
Optical Instruments
Calcualtions at Magnifying Glass, Glasses, Microscope, Telescope, Binocular, Objective, Digital Camera, Monitor, Image S ize: focal length, magnification, exit pupil, format, resolution

Photographic Exposure
Calculates the camera settings for exposure.

Number Systems Conversion
This allows values to be converted into other number systems: binary, octal, decimal, hexadecimal, other base.
Wheel Revolutions and Distance
Calculator for the number of revolutions a wheel makes on a certain distance.
Pendulum
Pump Size Calculator
Calculator for volume flow, volume, time, diameter and speed of a pump.

Accu Charge
Calculator for the speed and duration of a battery charge.

Photovoltaics - Calculate Power and Surface Area
Output per area and area per output of a photovoltaic system and solar modules.

Wind Turbine Power
Calculates the performance of a wind turbine.

Hydropower Turbine Calculator
Calculates the performance of a hydropower plant.
Reservoir Power Station Energy
Energy
Various calculations for the generation, storage and conversion of energy.

Letter Value Calculator
Assigns values to letters of text or a string and calculates the sum.
Calculate Hashes
Calculator for hashes with the functions:

Color Mixer
Mix a color from red, green and blue parts.

## Cars & Traffic

Speeding Fines in Germany
Find out the penalty for driving too fast.
Over speeding Car, Truck
Arrival Time
Calculator for the arrival time and duration of a trip from the start time, route and average speed.

E-Bike
Several calculators for electric bikes.

Knot - Nautical Mile - Calculator for Ships
Calculator for speed in knots and distance in nautical miles in shipping.
CO2 Emission
The carbon dioxide emissions of a car for a certain distance and per kilometer can be calculated here.

## Geography

Geo-coordinates
Conversion of different formats of geo-coordinates, e.g. from GPS devices.

Map Scale Calculator
Calculate with scales of a map.

Calculate the radius and diameter of the earth by latitude.

Random Position
Random location on earth, display with Google Maps.

Sun Position
Calculator for the position of the sun from the location, date and time.

## Art

Note Calculator
Calculates note frequencies when you click on a keyboard and generates corresponding sine tones.

Music Calculators
Several auxiliary calculators for notes and tones.

Color Calculator
Calculates the values for colors. With color palette and converter.

Square Tessellation
Creation of colored patterns from squares and determination of the material needed.

Circles around a Circle
Calculates the size of a certain number of circles around a center circle and draws a sketch. Sometimes creates interference patterns.

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