Last Updated: September 08, 2026
AjaxCalculators.com is independently owned, managed, designed, developed, authored, tested, reviewed, and maintained by Arefin Bappy, the website’s Owner and Admin.
Unless another person is specifically identified on a page, responsibility for the calculator implementation, supporting explanations, review process, and ongoing maintenance belongs to the Admin of AjaxCalculators.
AjaxCalculators does not use fictional authors, reviewers, experts, or editorial teams.
Our Editorial Purpose
AjaxCalculators was created to help people solve real everyday problems through practical, understandable, and useful calculators.
Our editorial decisions are guided by usefulness rather than page count.
A calculator or supporting page should have a clear purpose and should help users accomplish a genuine task.
Where appropriate, a calculator page should help users understand:
what is being calculated
which inputs are required
which formula or methodology is used
how the result is produced
which assumptions affect the result
what limitations apply
how the result can be interpreted, and
which sources support the methodology.
Who Creates and Reviews the Content?
The primary author, developer, tester, and reviewer of AjaxCalculators is Arefin Bappy.
He is a professional web developer with several years of experience in website design and development.
As the Admin, he is directly responsible for:
calculator development
website development
calculator testing
calculation implementation
methodology review
supporting content
technical review
interface design
debugging
maintenance
source review where applicable
usability improvements, and
correcting confirmed errors.
Where he is responsible for a page, AjaxCalculators may identify him as:
Author: Arefin Bappy
Developer: Arefin Bappy
Tested & Reviewed by: Admin, AjaxCalculators
Calculator Selection
AjaxCalculators does not aim to publish calculators simply because a keyword or topic exists.
A proposed calculator should address a practical calculation problem or provide useful functionality.
Before developing a calculator, the Admin may consider:
whether people genuinely need the calculation
whether the problem can be solved meaningfully with an online calculator
whether a recognised methodology exists
whether the result can be presented clearly
whether important assumptions can be explained
whether AjaxCalculators can add practical value and
whether the tool fits the overall purpose of the website.
Selecting a Calculation Method
Each calculator is designed around an established, widely accepted, or otherwise appropriate calculation method for its intended purpose.
Depending on the subject, this may include:
established mathematical formulas
recognised scientific equations
accepted conversion relationships
statistical methodologies
financial formulas
official reference values
published guidelines
technical standards
recognised estimation methods, or
other reputable subject-specific methodologies.
Not every calculation has one universally accepted formula.
Where multiple recognised methods exist and the choice could materially affect the result, AjaxCalculators aims to identify which method the calculator uses.
Source Standards
Where a calculator depends on external information, AjaxCalculators aims to use reputable and relevant sources.
Depending on the subject, preferred sources may include:
Government agencies and official organisations
Scientific organisations
Professional bodies
Universities and academic institutions
Peer-reviewed research
Recognised technical standards
Official documentation
Established textbooks and reference materials, and
Other reputable primary or specialist sources.
Sources should support the actual formula, reference value, guideline, definition, or methodology being used.
A source is not added merely to make a page appear authoritative.
Individual Calculator Review
Each calculator is individually reviewed.
Review is not limited to checking whether the page follows a shared website template.
Depending on the calculator, the Admin may review:
the problem being solved
calculation formula
methodology
inputs
outputs
units
conversion logic
assumptions
rounding
validation
limitations
examples
supporting explanations
sources
result presentation
mobile functionality
desktop functionality, and
general usability.
Different calculators require different forms of review.
A simple unit converter should not necessarily follow the same review process as a finance, health, science, construction, or statistics calculator.
Testing Standards
Every calculator is individually tested under the responsibility of the Admin.
Testing may include, where appropriate:
manually calculated examples
known results
published examples
independently calculated values
common input values
decimal values
zero values
negative values where applicable
very small values
very large values
minimum and maximum values
invalid inputs
missing inputs
different measurement units
unit combinations
boundary conditions
rounding behaviour
browser testing
mobile testing, and
desktop testing.
The purpose of testing is to confirm that the implemented calculator behaves consistently with its intended methodology.
Testing procedures vary according to the calculator rather than following one identical test sequence for every page.
Supporting Content
Supporting content should exist to help users understand or use a calculator.
It may include:
formula explanations
variable definitions
worked examples
interpretation guidance
assumptions
limitations
conversion information
methodology
source references
frequently asked questions, and
practical usage guidance.
Supporting content should correspond to the actual calculator.
For example:
a formula shown on the page should match the implemented calculation
worked examples should produce consistent results
assumptions should reflect the calculation logic
variable definitions should be accurate, and
sources should support the claims or methodology they accompany.
Health-Related Content
Health calculators are intended for general informational and educational purposes.
The Admin reviews their technical implementation but does not claim medical qualifications.
Where appropriate, health calculators should:
use recognised methodologies
cite reputable or authoritative sources
explain significant assumptions
describe relevant limitations, and
avoid presenting results as personalised diagnosis or treatment.
Health calculators must not be presented as substitutes for qualified healthcare professionals.
Financial Content
Financial calculators provide mathematical estimates based on formulas, assumptions, and user inputs.
Where appropriate, financial calculator pages should explain:
calculation method
rates or assumptions used
relevant limitations
whether figures are estimates
applicable source information, and
factors that may cause real-world results to differ.
They are not substitutes for personalised financial, investment, tax, accounting, insurance, or legal advice.
Construction and Technical Content
Construction and technical calculators may depend on additional real-world factors that cannot be fully represented by an online calculator.
Relevant pages should explain important assumptions and, where appropriate, remind users to consider:
site conditions
material specifications
building codes
manufacturer requirements
professional design
engineering considerations
safety requirements, and
regional regulations.
Review Dates
A Last Reviewed or Last Updated date should represent a genuine review or meaningful change.
Dates should not be automatically changed simply to make a page appear recently updated.
A review may include:
checking the calculation method
retesting functionality
reviewing sources
correcting an error
updating a changed standard
improving explanations, or
making a meaningful functionality change.
Corrections Policy
AjaxCalculators welcomes correction reports.
If a user reports a potential error, the Admin may investigate by:
Reproducing the submitted inputs
Checking the displayed result
Reviewing the implemented formula
Comparing the result with manual calculations or known examples
Reviewing relevant source material
Checking units and rounding
Testing related edge cases, and
Correcting the implementation or explanation where necessary.
Confirmed errors are corrected where appropriate.
If two results differ because of legitimate alternative methodologies or rounding conventions, AjaxCalculators may explain the difference rather than classify one method as incorrect.
Significant Changes
When a meaningful change is made to a calculator, the Admin may review related areas such as:
calculation logic
methodology
examples
sources
assumptions
result explanations
metadata, and
related calculator links.
The purpose is to keep the page internally consistent after changes.
Independence
AjaxCalculators is independently owned and operated.
Editorial decisions about calculator development, methodology, testing, review, corrections, and website improvements are made by the Admin.
Advertising, affiliate relationships, or third-party commercial arrangements should not determine the mathematical result produced by a calculator.
Where commercial relationships exist, they should be disclosed where appropriate.
User Feedback
User feedback is an important part of maintaining AjaxCalculators.
Visitors are encouraged to report:
incorrect results
broken calculators
unclear instructions
outdated references
possible methodology problems
mobile or browser issues
accessibility problems, and
suggestions for useful improvements.
Feedback does not automatically result in a change, but legitimate reports are reviewed.
Contact the Admin
Editorial questions, calculator corrections, source suggestions, and technical reports can be submitted through the Contact page or sent to:
Our editorial standard is straightforward:
Every calculator should exist to solve a real problem, use an appropriate method, provide useful supporting information, be individually tested, and remain accountable to a real person responsible for its quality.