Free online everyday calculators
Quick, accurate calculators for everyday maths: percentages, discounts, age, BMI, GPA and the number of days between two dates. Every result shows the formula so you can check the working.
Percentage Calculator
% of a number, % change, increase and decrease.
Age Calculator
Exact age in years, months and days.
BMI Calculator
Body Mass Index with healthy weight range.
Discount Calculator
Sale price and savings after % off.
GPA Calculator
Semester and cumulative GPA on a 4.0 scale.
Date Difference Calculator
Days, weeks, months and working days between dates.
Time Zone Converter
Convert times between cities worldwide.
Calorie Calculator
Daily calories to lose, gain or maintain.
BMR Calculator
Calories your body burns at rest.
Grade Calculator
Your class grade from weighted scores.
Final Grade Calculator
The score you need on your final.
Test Grade Calculator
Percent and letter from wrong answers.
Time Card Calculator
Weekly hours, overtime and pay.
Military Time Converter
24-hour ⇄ AM/PM time.
Tip Calculator
Tip and split the bill fast.
Roof Pitch Calculator
Pitch, angle, area and shingle bundles.
Square Footage Calculator
Area of rooms and floors in sq ft.
Concrete Calculator
Cubic yards and bags of concrete.
Paint Calculator
Gallons of paint for any room.
Tile Calculator
Tiles and boxes for floors and walls.
Fence Calculator
Posts, rails and pickets for a fence.
Mulch, Gravel & Soil Calculator
Cubic yards of mulch, gravel or soil.
Deck Calculator
Deck boards, joists and screws.
Gas & Fuel Cost Calculator
Fuel cost for any trip.
Electricity Cost Calculator
What an appliance costs to run.
Pregnancy Due Date Calculator
Your due date and weeks pregnant.
Ovulation Calculator
Your fertile window and ovulation day.
Body Fat Calculator
Body fat % with a tape measure.
Ideal Weight Calculator
Healthy weight for your height.
Water Intake Calculator
How much water to drink daily.
Sleep Calculator
Best bedtime and wake-up times.