Company
About Do The Calculation
525+
calculator pages
Finance, business, health, math, utility, and planning tools.
100+
educational guides
Plain-language explainers tied to real calculator workflows.
Local
privacy model
Calculations run in the browser and saved items stay on-device.
Open
formula notes
Assumptions, methods, and limitations are made visible.
Why we exist
Calculators should explain the answer, not just return a number.
Most online calculators stop at the final output. We build pages that show the formula, the assumptions that matter, and what users should check before making a decision.
We started Do The Calculation to make everyday financial, business, health, math, and utility calculations easier to understand. The platform is built as a long-term public tool library: fast pages, simple controls, useful educational content, and reusable systems that scale as new calculators and templates are added.
Accurate by design
Every calculator uses explicit, documented formulas with readable assumptions and result breakdowns you can verify.
Practical first
Inputs, results, examples, and next steps are built for quick decisions, not abstract reference pages.
Privacy aware
Personal inputs are not sent to our servers. Saved calculations are stored locally in your browser.
Editorial methodology
A clear review path before a calculator goes live.
Every calculator and guide follows the same practical standard: source the method, test the result, then publish the context users need to interpret it.
Source the formula
We begin with recognized references such as IRS publications, WHO/CDC guidance, standard financial math, and domain-specific technical sources.
Test known outputs
Calculator logic is checked against known scenarios so formulas, units, rounding, and edge cases behave predictably before publishing.
Publish with context
Pages explain assumptions, limitations, formula logic, and professional-advice boundaries so users understand what the result means.
Trust & transparency
Operating standards users can hold us to.
The site is designed around useful tools, supporting content, and spreadsheet resources that connect back to real planning workflows.
Calculator assumptions stay visible and easy to review.
YMYL topics use plain language around estimates and professional-advice boundaries.
Formula sources are grounded in recognized public, academic, or industry references.
Pages are designed for speed, mobile use, readable contrast, and assistive technology.
Personal calculator inputs are not sold or shared.
Legal and policy pages stay readable, direct, and easy to find.
525+ calculator pages
Focused tools for mortgages, loans, investing, taxes, business margins, health estimates, dates, grades, units, and more - each with formula documentation and worked examples.
Templates and guides
Downloadable spreadsheet templates and educational articles help users move from a quick estimate to a more complete plan with deeper understanding.
Leadership
Founder & Co-Founder
Product direction, calculator architecture, spreadsheet modeling, and editorial standards are led by our founding team.
Sheharyar Shahid
Founder & Lead Developer
Data Analyst & Advanced Excel Specialist (DAE)
Founder of Do The Calculation. Sheharyar is a data analyst and product developer with extensive experience building advanced financial models, automated spreadsheet calculators, and interactive web tools. He founded Do The Calculation to translate complex spreadsheet modeling logic into fast, accessible, and privacy-first web calculators.
Kehkishan Shahid
Co-Founder & Senior Template Developer
Senior Data Analyst & Spreadsheet Architect (6+ years experience)
Co-Founder of Do The Calculation. Kehkishan specializes in building advanced spreadsheet architectures, automated Google Sheets models, and interactive dashboard templates, and helps guide the platform's spreadsheet product direction. She focuses on developing clean, validation-supported tools for business planning and financial tracking.
How we check the maths
Where our numbers come from
We are a small team of data analysts and spreadsheet developers, not a research institute. Rather than ask you to trust credentials, each calculator shows its formula and, where it implements a published equation, standard, or government rule, names that source on the page so you can check it yourself.
The formula is on the page
Every calculator states the equation it evaluates and the assumptions it makes, so you can reproduce the result by hand or in a spreadsheet.
Published sources are cited by name
Where a tool implements a specific published equation or official rule, it links the primary source under "Sources & methodology" rather than paraphrasing it.
Limits are stated, not hidden
Each tool says what it does not account for. An estimate that ignores tax, fees, or local variation says so next to the result.
Nothing leaves your browser
Calculations run locally. We do not receive, store, or transmit the figures you type in.
Corrections are welcome
If a formula or a figure looks wrong, tell us. We would rather fix a calculator than defend it.
No professional advice
These are planning tools. For a decision with financial, medical, or legal consequences, check the result with a qualified professional.
BI & automation engineers
Spreadsheet & Template Developers
Our template development team engineers Excel and Google Sheets planning tools with clean structure, validation, formulas, and dashboard-ready outputs.
Dur-e-Sameen Shahid
Senior Template Developer & BI Specialist
Senior BI Engineer & Excel Architect (6+ years experience)
Expert in financial forecasting templates, automated loan amortization models, and Power Query data transformation systems. Dur-e-Sameen specializes in engineering user-ready offline spreadsheet calculators.
Shahsawar Shahid
Senior Spreadsheet Architect & Data Analyst
Senior Financial Modeler & Excel Automator (6+ years experience)
Professional spreadsheet developer specializing in corporate finance templates, debt payoff calculators, and custom Excel macro automation. Shahsawar ensures offline models maintain absolute mathematical alignment with our web-based tools.
Shahzaib Shahid
Spreadsheet Developer & Data Analyst
Spreadsheet Developer & Excel Automation Specialist
Spreadsheet developer focused on building structured Excel and Google Sheets templates with clean formulas, data validation, and reliable automation. Shahzaib supports the template development team in engineering easy-to-use planning tools for everyday budgeting and business tracking.
Important context
Need a calculator improved or added?
Send a request with the calculator, formula, or workflow you want to see. Practical requests help shape the next pages we build.