Utility Calculators
19 free everyday utility calculators for health, dates, conversions, and productivity. Calculate your BMI, find your age in days, convert units, track calories, estimate GPA, or plan your due date — all instantly without any registration.
BMI Calculator
Calculate Body Mass Index and check if your weight is in a healthy range for your height.
Body Fat Calculator
Estimate body fat percentage using the Navy method with measurements.
Calorie Calculator
Calculate daily calorie needs (TDEE) based on age, weight, height, and activity level.
Water Intake
Calculate how much water you should drink daily based on your weight and activity.
Age Calculator
Calculate exact age in years, months, days, hours, and minutes from date of birth.
Date Calculator
Find the number of days between two dates or add/subtract days from a date.
Due Date Calculator
Calculate estimated due date for pregnancy based on last menstrual period (LMP).
Percentage Calculator
Calculate percentages, percentage change, increase/decrease, and ratios.
GPA Calculator
Calculate weighted GPA from course grades and credit hours for any grading scale.
Unit Converter
Convert between hundreds of units across length, weight, volume, temperature, and more.
Length Converter
Convert between meters, feet, inches, km, miles, cm, mm, and more.
Weight Converter
Convert between kg, lbs, grams, ounces, stones, and other weight units.
Area Calculator
Calculate area of circles, rectangles, triangles, and convert between area units.
Volume Converter
Convert between liters, gallons, ml, cubic meters, cups, pints, and more.
Aspect Ratio
Calculate and convert aspect ratios for screens, images, and video formats.
Fuel Cost Calculator
Estimate fuel cost for trips based on distance, mileage, and current fuel prices.
Speech Time
Estimate how long it will take to read or deliver a speech from word count.
Time Duration
Calculate the exact duration between two times in hours, minutes, and seconds.
Subnet Calculator
Calculate IPv4 subnet mask, network address, broadcast, and host range.