Health

Body Fat Calculator

Estimate your body fat percentage using the US Navy method based on waist, neck, and heigh

Finance

Loan EMI Calculator

Calculate your monthly EMI for home, car, or personal loans. See total interest and paymen

Ecology

Electricity Cost Calculator

Calculate the electricity cost of any appliance based on wattage, daily usage hours, and t

Health

Calorie Calculator

Calculate your daily calorie needs (TDEE) based on age, weight, height and activity level.

Math

Percentage Calculator

Easily calculate percentages — find X% of Y, percentage change, or what percent X is of Y.

Pregnancy

Heart Rate Zone Calculator

Calculate your 5 heart rate training zones based on your age or custom max heart rate.

Everyday

Date Difference Calculator

Enter a start date and end date to calculate the difference in days. Perfect for planning

Health

Body Fat Percentage Calculator

Estimate body fat percentage using the US Navy method for men and women.

Everyday

Power Consumption Calculator

Calculate total household power consumption in kWh and estimate monthly electricity bill f

Everyday

Data Storage Converter

Convert between bytes, KB, MB, GB, TB and more. Essential for developers and IT profession

Everyday

Aspect Ratio Calculator

Calculate missing width or height from an aspect ratio, or find the ratio of any image or

Finance

Profit Margin Calculator

Calculate gross profit margin, net profit margin, markup percentage, and selling price fro

Physics

Ohm's Law Power Calculator

Calculate electrical power in watts from voltage and current, or derive any missing electr

Pregnancy

Body Surface Area Calculator

Calculate body surface area (BSA) using height and weight with Mosteller and DuBois formul

Finance

Discount Calculator

Calculate the final price after discount, the discount amount, and the percentage saved on

Date & Time

Age Calculator

Calculate your exact age in years, months and days from your date of birth.

Chemistry

Empirical Formula Calculator

Find the empirical formula of a compound from the percentage composition of its elements.

Math

Mortgage Affordability Calculator

Calculate the maximum home loan you can afford based on your income, expenses, and interes

Physics

Ohm's Law Calculator

Calculate voltage, current, resistance or power using Ohm's Law. Solve for any electrical

Finance

Salary Calculator

Convert between hourly, daily, weekly, monthly and annual salary. Calculate take-home pay

Math

Markup Calculator

Calculate selling price, markup percentage, and profit from cost price and desired markup

Finance

ROI Calculator

Calculate Return on Investment (ROI) percentage and net profit from your investment data.

Business

Salary Increment Calculator

Calculate future salary growth based on yearly increment percentage.

Physics

Ohm Law Power Triangle Calculator

Calculate voltage, current, resistance, and power using any two known electrical values.

Marine

Sailing Distance Calculator

Calculate the total nautical distance and estimated sailing time of your yacht voyage acro

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

Ecology

Household Water Usage Calculator

Estimate daily, weekly and annual household water usage based on showers, toilet flushes,

Business

Employee Turnover Rate Calculator

Calculate employee turnover rate for a period based on the number of separations and the a

Date & Time

Lunar Age Calculator

Calculate your age according to the traditional lunar calendar used in Chinese, Korean and

Pregnancy

Calorie Intake by Age Calculator

Find the recommended daily calorie intake for children, teens and adults based on age, gen

Math

Accounts Receivable Turnover Calculator

Calculate accounts receivable turnover ratio and average collection period to assess busin

Math

Average Revenue Per User Calculator

Calculate Average Revenue Per User (ARPU), MRR, ARR and revenue growth metrics for SaaS an

Math

GPA Calculator

Calculate your semester GPA and cumulative GPA based on course grades and credit hours.

Marine

Seafarer Contract Calculator

Quickly find how many days are left in your seafarer contract, your completion date, and y

Food

Coffee Caffeine Calculator

Calculate your total daily caffeine intake from coffee, tea and other beverages and check

Business

Shipping Cost Calculator

Estimate shipping costs based on package weight, dimensions and shipping zone.

Pregnancy

Creatinine Clearance Calculator

Estimate kidney function (GFR) using the Cockcroft-Gault equation from age, weight, and se

Physics

Ohm Law Capacitor Charge Calculator

Calculate the charge, energy stored, and voltage across a capacitor given capacitance and

Finance

Anemia Risk Calculator

Assess anemia risk by checking hemoglobin levels against WHO reference ranges by age and g

Construction

Paint Coverage Calculator

Calculate how much paint you need to cover walls, ceilings or any surface area for your pr

Math

Margin of Safety Calculator

Calculate the margin of safety in units, revenue and percentage for any business to measur

Math

Churn Rate Calculator

Calculate monthly and annual customer churn rate, retention rate, and average customer lif

Engineering

Tank Volume Calculator

Calculate the volume and capacity of cylindrical, rectangular and horizontal tanks in gall

Everyday

Tip Split Calculator

Calculate tip amount and split the total bill among any number of people with custom tip p

Everyday

Electricity Bill Splitter

Split your electricity bill fairly among roommates or household members based on usage or

Everyday

Dog Age Calculator

Convert your dog age to human years based on size and breed group for a more accurate comp

Marine

ETA Calculator

Precise estimated time of arrival calculations for your destination port based on distance

Marine

Marine Bunker Fuel Consumption Calculator

Calculate marine bunker fuel consumption accurately for a single voyage or across a whole

Marine

Seafarer Salary Calculator

Calculate your monthly gross wage and total contract earnings from basic wage, fixed overt

Marine

Volume to Weight Converter

Convert cargo volume to weight and vice versa using cargo density or stowage factor, for c

Marine

Distance, Speed & Time Calculator

Calculate distance, speed, or time for any voyage leg, with an ETA mode, multi-leg passage

Marine

Mercator Sailing Course and Distance Calculator

Determine the true course and distance between two coordinates using Mercator sailing, acc

Marine

True Wind Calculator

Convert a ship apparent wind reading into true wind speed and direction, useful for weathe

Marine

Average Speed Calculator

Calculate the true weighted average speed across multiple voyage legs in knots, kilometers