Complete calculator matrix
Finance, health estimates, dates, time, school, units, random numbers and math calculators in one place.
Online calculators · No upload · No login
Free Online Calculators
A complete static calculator toolbox for everyday math, finance, health estimates, dates, time, school, random numbers, fractions, units and more.
30 live calculatorsStatic upload readyBrowser-basedNo login required
Online Calculator Tools
All calculators are available now. Choose a tool below and calculate locally in the browser.
Age Calculator
Calculate age from date of birth to today or any target date.
LiveBMI Calculator
Calculate Body Mass Index using metric or US units.
LivePercentage Calculator
Calculate percentages, percentage change and reverse percentages.
LiveLoan Calculator
Calculate monthly loan payments, total payment and interest.
LiveMortgage Calculator
Estimate monthly mortgage payments with down payment and interest.
LiveSimple Interest Calculator
Calculate simple interest over time.
LiveCompound Interest Calculator
Calculate compound growth with contributions.
LiveDiscount Calculator
Calculate sale price, savings and final price.
LiveSales Tax Calculator
Calculate tax amount and final price.
LiveTip Calculator
Calculate tip, total bill and split amounts.
LiveSalary Calculator
Convert hourly, weekly, monthly and annual salary.
LiveTime Duration Calculator
Calculate time duration between two times.
LiveDate Calculator
Add or subtract days, weeks, months and years from a date.
LiveDays Between Dates Calculator
Calculate the number of days between two dates.
LiveUnit Price Calculator
Compare price per unit for products.
LiveFuel Cost Calculator
Estimate trip fuel cost from distance, efficiency and fuel price.
LiveCalorie Calculator
Estimate daily calories using BMR and activity level.
LiveBMR Calculator
Calculate basal metabolic rate using Mifflin-St Jeor formula.
LivePregnancy Due Date Calculator
Estimate pregnancy due date from last period date.
LiveGPA Calculator
Calculate GPA from grades and credits.
LiveGrade Calculator
Calculate weighted course grade.
LiveRandom Number Generator
Generate random numbers within a range.
LiveFraction Calculator
Add, subtract, multiply and divide fractions.
LiveScientific Calculator
Evaluate common math expressions locally.
LiveArea Calculator
Calculate area for rectangle, circle and triangle.
LiveVolume Calculator
Calculate volume for box, cylinder and sphere.
LiveSpeed Calculator
Calculate speed, distance or time.
LiveTemperature Converter
Convert Celsius, Fahrenheit and Kelvin.
LiveData Storage Converter
Convert bytes, KB, MB, GB, TB and more.
LiveAspect Ratio Calculator
Calculate missing width or height from an aspect ratio.
Live
🔥 NameCrane
🔥 Colocrossing
🔥 Kdatacenter
🔥 GreenCloud VPS
🔥 Reliablesite
🔥 Hero-sms
🔥 Premium Ad Slot
🔥 Tech Support
🔥 Fiverr Pro
🔥 Fiverr Marketplace
🔥 Advertising Position
🔥 Advertising Position
🔥 Advertising Position
🔥 Advertising Position
🔥 Free Short Links
Partners & Recommended Sponsors
Why use 100138?
A focused online calculator site for everyday users, students, website visitors and business workflows.
Browser-based
Most calculations run locally in JavaScript, so your input does not need to be uploaded to a server.
Direct upload ready
No PHP, no database and no backend setup required. Upload the files to your domain root.
FAQ
Are all calculators available?
Yes. This version includes 30 live calculators and does not use Planned placeholders.
Is my data uploaded?
No. The calculators run in the browser. The site does not send calculator input to a backend.
Can I upload this to a normal web host?
Yes. It is a static HTML/CSS/JS website.