Mathematics
Percentage calculator
Calculate percentage increase, decrease, parts and totals.
Online calculators
Online calculators for everyday calculations
The first tools already cover percentages, length conversions, date differences, BMI, age, daily calories, scientific calculations, due date estimates, random generation and ovulation estimates, with more calculators planned next.
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Calculators
Available and upcoming calculators
Mathematics
Percentage calculator
Calculate percentage increase, decrease, parts and totals.
Mathematics
Scientific calculator
Evaluate scientific expressions, powers, roots and trigonometry.
Mathematics
Statistics calculator
Calculate mean, median, mode, variance and standard deviation.
Dates and time
Age calculator
Calculate age in years, months and days, plus the next birthday.
Dates and time
Date difference calculator
Count days, weeks, months and years between two dates.
Conversions
Length converter
Convert metres, kilometres, inches, feet, yards and miles.
Dates and time
Time and hours calculator
Add, subtract and total times, hours and breaks.
Health
BMI calculator
Estimate body mass index from height and weight.
Health
Calorie calculator
Estimate daily calorie needs from body data and activity.
Education
Grade calculator
Calculate simple averages, weighted grades and final exam needs.