Last updated: 08/09/2026
Helping People Solve Everyday Problems
AjaxCalculators.com was created with one clear purpose: to help people solve everyday problems through practical, easy-to-use, and understandable calculators.
The website is independently owned, managed, designed, developed, tested, reviewed, and maintained by Arefin Bappy, a professional web developer with several years of experience in website design and development.
AjaxCalculators provides calculators and converters across areas such as mathematics, finance, science, health and fitness, construction, education, measurements, conversions, everyday life, and other practical subjects.
The goal is not simply to return a number.
Where appropriate, calculator pages are designed to help users understand:
what the calculator does
which information is required
which formula or calculation method is used
how the result is produced
which assumptions may affect the result
how the result should be interpreted
important limitations, and
which sources or standards support the calculation method.
Who Is Behind AjaxCalculators?
AjaxCalculators is owned and operated by Arefin Bappy.
He serves as the website’s:
Owner
Admin
Developer
Author
Calculator Tester
Reviewer
Website Designer
Maintainer
The Admin has several years of practical experience in website design and development, interactive website functionality, user-interface development, calculator implementation, responsive design, debugging, testing, technical troubleshooting, and website maintenance.
His professional development background can also be viewed through his public Fiverr profile under Arefin Bappy / @webdevbappy.
AjaxCalculators is not operated by an anonymous publishing organisation or fictional editorial team.
The Admin takes direct responsibility for the website’s development, calculator implementation, testing, review, supporting content, maintenance, and ongoing improvement.
Why AjaxCalculators Was Created
Everyday life involves calculations.
People regularly need to:
calculate percentages
convert measurements
estimate quantities
compare values
work with dates and time
estimate materials
understand mathematical formulas
calculate financial scenarios
convert units
interpret numerical information, or
solve other practical problems.
Many of these tasks can become unnecessarily complicated when users have to search for formulas, understand unfamiliar units, perform conversions, or complete several calculations manually.
AjaxCalculators was created to simplify those tasks.
Our purpose is simple:
To help people solve real everyday problems through useful, accessible, and transparent online calculators.
How Our Calculators Are Designed and Developed
Each calculator on AjaxCalculators is designed to solve a specific problem.
Before implementing a calculator, the Admin identifies an established, widely accepted, or otherwise appropriate calculation method for the calculator’s intended purpose.
Depending on the subject, this may involve:
standard mathematical formulas
accepted conversion relationships
recognised scientific equations
financial formulas
statistical methodologies
established estimation methods
official reference values
published guidelines
recognised technical standards, or
other reputable methodologies appropriate to the calculation.
Some calculations have more than one accepted formula or method.
When the choice of methodology could materially affect the result, AjaxCalculators aims to clearly identify which method is being used.
Every Calculator Is Individually Tested and Reviewed
A calculator is not considered complete simply because its code runs successfully.
Each calculator is individually tested and reviewed by the Admin.
Depending on the type of calculator, testing may include:
manually calculated examples
known results
published examples
normal input values
- decimal values
zero values
negative values where applicable
very small or large values
different measurement units
unit conversions
incomplete inputs
invalid inputs
boundary conditions
rounding behaviour
desktop functionality
mobile functionality, and
general usability.
Testing procedures vary according to the calculator because different calculations require different forms of verification.
The purpose of this testing is to confirm that the calculator behaves consistently with its intended formula or methodology.
Calculation Methods and Sources
Where a calculator depends on externally established information, AjaxCalculators aims to use reputable and appropriate sources.
Depending on the subject, sources may include:
Government agencies and official organisations
Scientific and professional organisations
Universities and academic institutions
Peer-reviewed research
Recognised technical standards
Established textbooks and reference material
Official documentation, and
Other reputable subject-specific sources.
Where appropriate, individual calculator pages identify their calculation method and supporting sources.
Accuracy and Transparency
AjaxCalculators aims to provide reliable implementations of the calculation methods described on its pages.
However, no online calculator can guarantee that every possible result will be appropriate for every situation.
Results may be affected by:
information entered by the user
measurement accuracy
rounding
assumptions
differences between accepted formulas
regional standards
changing regulations
changing scientific guidance, or
limitations of the underlying calculation method.
Where these factors are significant, AjaxCalculators aims to explain them clearly.
Health, Financial, Construction and Other Important Calculations
Some calculators involve subjects where results may influence important decisions.
The Admin is responsible for the website’s technical development, implementation, and testing, but does not claim medical, financial, legal, engineering, or other regulated professional qualifications unless explicitly stated.
Calculators involving these areas are intended for informational and educational purposes and should not replace appropriately qualified professional advice where such guidance is required.
Corrections and Feedback
Careful testing reduces the possibility of errors, but software and information can still contain mistakes.
Users are encouraged to report:
incorrect results
possible formula problems
outdated sources
incorrect conversions
confusing explanations
broken functionality
mobile or browser problems, or
other technical issues.
Reported problems are reviewed by the Admin, and confirmed errors are corrected where appropriate.
About the Admin
Arefin Bappy
Owner, Admin, Developer, Author & Reviewer
AjaxCalculators.com
Professional skills and experience include:
Website design
Website development
Front-end development
Interactive web development
Calculator development
User-interface design
Responsive development
Testing and debugging
Website maintenance
Technical troubleshooting
Performance and usability improvements
Professional profile:
https://www.fiverr.com/webdevbappy
Our Commitment
AjaxCalculators will continue to focus on the reason it was created:
helping people solve real everyday problems.
Our priority is not simply to increase the number of pages on the website.
Our priority is to develop calculators that are useful, understandable, based on appropriate established methods, individually tested, reviewed by a real developer, transparent about important assumptions, and improved whenever better information or functionality becomes available.