Days Between Two DatesCalculate total elapsed days, weeks, months, and hours between any two start and end calendar dates.
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Days Between Two Dates
Calculate total elapsed days, weeks, months, and hours between any two start and end calendar dates.
Age Calculator
Determine chronological age down to precise years, months, and days, with a clear days-old total.
Business Days Calculator
Count working days between two dates with optional public holidays by country, custom weekends, and custom days off.
Percentage Calculator
Find percentage of a number, percent change, and increase or decrease — with a clear worked step.
Date & Time Calculators
Count days, ages, and working-day spans.
Age CalculatorDetermine chronological age down to precise years, months, and days, with a clear days-old total.
Business Days CalculatorCount working days between two dates with optional public holidays by country, custom weekends, and custom days off.
Add or Subtract DaysAdd or subtract exact quantities of days, weeks, months, or years from any starting date.
Finance Calculators
Plan loans, interest, and savings goals.
New
Loan CalculatorMonthly payment (EMI), total interest, payoff date, amortization schedule, and optional extra payments — reducing or flat rate.New
Compound Interest CalculatorFuture value with monthly contributions, compounding frequency, effective annual yield (APY), optional inflation, and a yearly breakdown.New
Savings Goal CalculatorHow much to save each month, or how long a goal will take — with optional interest and inflation.Health & Fitness Calculators
BMI, calorie needs, pregnancy due dates, and wellness screening tools.
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BMI CalculatorBody mass index from height and weight — metric or imperial, with WHO adult categories and optional Asian cut-offs.New
Calorie CalculatorEstimate BMR and TDEE (maintenance calories) with Mifflin–St Jeor and activity levels — metric or imperial.New
Pregnancy Due Date CalculatorEstimate a due date from last period (LMP), conception date, IVF embryo transfer, or ultrasound — with weeks pregnant and trimester dates.Math & Education Calculators
Percentages, averages, and unit helpers.
Percentage CalculatorFind percentage of a number, percent change, and increase or decrease — with a clear worked step.
Average CalculatorCompute mean, median, mode, range, geometric mean, and standard deviation from any list of numbers.
Unit ConverterConvert length, weight, volume, and temperature — cm to inches, kg to lbs, Celsius to Fahrenheit, and more.
GPA & CGPA CalculatorSemester SGPA and overall CGPA with common 4.0, 5.0, and 10-point scales, plus a target planner.
Knowledge base and methodology
Frequently Asked Questions
Learn how Calculator Hub guarantees numerical precision, protects client data privacy, and determines formula standards.
Are my inputs kept completely private?
Yes. All arithmetic and date calculations run in your browser. Your figures and dates are not transmitted to our servers. On business-day tools, choosing a country loads a static holiday list for that country; inputs are not stored or put into the URL.
How does the Days Between Dates tool handle leap years?
Our date logic adopts the Gregorian calendar standard, fully factoring in leap years (years divisible by 4, except century years not divisible by 400). Calculations use local calendar dates only — there is no timezone conversion to UTC — so you avoid the off-by-one-day errors that UTC conversion can introduce around daylight saving boundaries.
What formulas will the financial and loan calculators use?
The Loan Calculator uses the standard reducing-balance amortization formula M = P[r(1+r)^n] / [(1+r)^n − 1]. The Compound Interest Calculator estimates future value with compounding and optional contributions. The Savings Goal Calculator finds a monthly amount or timeline for a target.
Is Calculator Hub free for commercial and educational use?
Yes. Every tool on Calculator Hub (14 free calculators) is permanently unrestricted and free for students, engineers, financial planners, and researchers without any subscription barriers or account signups.
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