✨ Other calculators

Everything that does not fit elsewhere. 20 calculators.

• Aquarium Volume CalculatorCalculate fish tank volume in litres and gallons from its dimensions — plus the approximate weight when filled.
• Aspect Ratio CalculatorResize images and video while keeping the aspect ratio — find the missing width or height.
• Battery Life CalculatorEstimate how long a battery will last from its capacity (mAh) and the device's current draw.
• Cat Age Calculator (Cat Years to Human Years)Convert your cat's age into human years using the widely used veterinary guideline.
• Data Storage Converter (KB, MB, GB, TB)Convert data sizes between bytes, KB, MB, GB, TB and binary units (KiB, MiB, GiB).
• Dog Age Calculator (Dog Years to Human Years)Convert your dog's age to human years using the modern DNA-based formula — and compare with the old "×7" rule.
• Dog Food Calorie CalculatorEstimate your dog's daily calorie needs from body weight and life stage — plus cups of food per day.
• Download Time CalculatorEstimate how long a file takes to download or upload at a given internet speed (Mbps).
• LED Resistor CalculatorCalculate the series resistor needed for an LED from supply voltage, LED forward voltage and current.
• LPG Gas Cylinder Duration CalculatorEstimate how many days an LPG gas cylinder will last from its weight and your daily cooking use.
• Ovulation & Fertile Window CalculatorEstimate your ovulation date, fertile window and next period from your last period and cycle length.
• Paper Weight Calculator (GSM)Calculate the weight of paper sheets or a ream from GSM and paper size.
• Password Strength (Entropy) CalculatorCalculate password entropy in bits and estimate how long it would take to crack by brute force.
• Pregnancy Due Date CalculatorEstimate your baby's due date and how many weeks pregnant you are from the first day of your last period.
• Print Size Calculator (Pixels & DPI)Calculate the maximum print size of an image from its pixel dimensions and print resolution (DPI/PPI).
• Screen PPI Calculator (Pixel Density)Calculate pixels per inch (PPI) and dot pitch of a screen from its resolution and diagonal size.
• Test Score & Grade Percentage CalculatorConvert a test score to a percentage — and find the letter grade on a typical scale.
• Video File Size Calculator (Bitrate)Calculate video file size from bitrate and duration — or the bitrate for a target file size.
• Voltage Divider CalculatorCalculate the output voltage of a resistor voltage divider — or the resistor needed for a target output.
• Water Heater (Geyser) Heating Time CalculatorCalculate how long an electric water heater takes to heat a tank of water — and the energy used.