Modulus r
- Argument θ
- °
- Result, rounded to 4 decimal places
- Argument θ
- rad
- Result, rounded to 4 decimal places
Free calculators with the working shown
Vectors, complex numbers and everyday sizes, read off at a glance
Type your numbers and the answer updates as you go, with the formula and a worked example on every page.
- Calculators
- 50
- Panels
- 8
- Formula shown
- always
The eight panels
See every panel →
Unit vectors, cross products, planes, rotation, spherical coordinates.
- Principal Normal Unit Vector Calculator
- 3D Unit Vector Calculator0.2857
- Vector Cross Product Calculator (3D)-3.000
6 pages Open →
Polar and rectangular form, hyperbolic functions.
- Complex Error Function Calculator
- Complex Number to Polar Form Calculator5.0000
- Incomplete Gamma Function Calculator & Guide
6 pages Open →
Quadratic and cubic discriminants and roots.
2 pages Open →
Modulo, congruences and consecutive integers.
18 pages Open →
Curtain fabric, picture hanging, luggage size.
6 pages Open →
Absolute and relative change, churn rate.
- Daily Data Usage Calculator: How Much Do You Need?
- Days Inventory Outstanding Calculator and Formula15.00 days
5 pages Open →
Pulley speeds and belt lengths.
- How to Calculate Fuel Consumption8.00 L/100km
- LED Efficiency: How to Calculate It88.9 lm/W
5 pages Open →
Ice cream for a crowd, brine strength.
- Ice Cream Quantity Calculator for a Party6.00 qt
- How to Calculate Brine Concentration (Salt Percent)5.66 %
2 pages Open →
Calculators to start with
See all 50 →- 01Complex Number to Polar Form CalculatorComplex Numbers and Functions5.0000
- 023D Unit Vector CalculatorVectors and Coordinates0.2857
- 03Vector Cross Product Calculator (3D)Vectors and Coordinates-3.000
- 04Convert to Spherical Coordinates CalculatorVectors and Coordinates1.7321
- 05How to Calculate the Discriminant of a QuadraticAlgebra and Polynomials1.0000
- 06Congruence Modulo Calculator (a ≡ b mod n)Numbers and Counting2
- 07Curtain Yardage CalculatorSizing and Fit8.33 yd
- 08Picture Frame Hanging Calculator (Nail Height)Sizing and Fit66.00 in
- 09Absolute Change and Relative Change CalculatorMetrics and Rates20.00
- 10Pulley RPM CalculatorMachines and Energy875 rpm
How every readout is worked
Read the method →- 01Textbook formulaEach page uses the standard formula and prints it, with every variable and unit defined.
- 02Live answerThe result updates as you type; inputs outside a sensible range are refused with a message.
- 03Stated roundingEach result says how it is rounded; things you buy in whole units round up.
- 04Checked exampleThe worked example repeats the sum step by step with the default numbers.