Pregnancy

Ovulation Calculator

Calculate your ovulation date and fertile window based on your last period and cycle lengt

Unit Converter

Length Converter

Convert between all length and distance units — meters, feet, inches, miles, kilometers an

Physics

Torque Calculator

Calculate torque from force and lever arm length, or find force or distance given any two

Physics

Wavelength Frequency Calculator

Calculate wavelength, frequency, or wave speed for any electromagnetic or sound wave.

Random

Password Generator

Generate strong, secure random passwords with custom length and character options.

Everyday

Unit Converter

Convert between common units of length, weight, temperature, and volume in one handy tool.

Pregnancy

Fertile Window Calculator

Calculate your fertile window and most likely ovulation date based on your cycle length.

Engineering

Voltage Drop Calculator

Calculate voltage drop and percentage drop across a cable run based on current, cable leng

Pregnancy

Conception Date Calculator

Estimate your likely conception date based on your last menstrual period (LMP) and average

Physics

Wavelength to Energy Calculator

Calculate the energy of a photon from its wavelength or frequency using E=hf and E=hc/λ.

Construction

Stair Calculator

Calculate stair dimensions including number of steps, riser height, tread depth and total

Pregnancy

Ovulation Calculator

Calculate your ovulation day and fertile window based on your last period date and cycle l

Marine

Anchor Swinging Radius Calculator

Determine the safe anchoring swing radius using vessel length overall, chain length paid o

Marine

Anchor Scope and Chain Length Calculator

Find how much anchor chain to pay out when anchoring, based on water depth, bow height, an

Marine

Maritime Unit Converter

Real-time conversion across multiple maritime categories including speed, length, pressure