Disclaimer

Last updated: October 28, 2026

How these tools were made

I built every tool on this website myself. Each calculator and converter began with my own need, followed by personal research into the formula, the standard, or the rate behind the tool. The full collection took four months of work: researching sources, building the tools, testing results by hand, and writing the explanations. Salma Tahira then reviewed each page before publication. No tool on this site is a copy of another site's tool, and no page went live untested.

General accuracy

The tools aim for exact results, and each tool page shows the formula or rate the tool uses, with references to official or trusted sources. Standards change, prices change, and official rates change. Always confirm a result against the official source before you act on the result in a legal, financial, medical, or government matter.

Health and fertility tools

The HbA1c converter and the safe period calculator provide information only. Neither tool gives medical advice, a diagnosis, or a treatment plan. A laboratory result and a clinician's judgment outrank any estimate on this site. The calendar method of birth control carries known failure rates in typical use, and the tool page states those rates plainly with references. Speak to a qualified medical professional about any personal health decision.

Finance, salary, and cost tools

The zakat calculator, the salary calculator, the Umrah cost calculator, and the hair transplant cost calculator work with rates, thresholds, and market prices that move over time. A result from one of these tools is an estimate for planning. The estimate is not a fatwa, a tax filing, a job offer, a travel quotation, or a clinic price. Religious rulings belong to qualified scholars, tax figures belong to the official tax authority, and final prices belong to the airline, hotel, or clinic you book with.

Land measurement tools

Marla, kanal, and related land units follow different standards in different cities and revenue records. The land tools on this site show the standard in use for each result and name the standard on the page. A registered deed and the official revenue record decide the legal size of any specific plot.

Education tools

The marks to percentage calculator applies the formula a student selects. Boards and universities apply their own grading rules, grace marks, and rounding policies. The official mark sheet remains the final record.

External links

Pages on this site link to official and trusted sources so a reader can verify a fact. Those sites belong to their owners, and I hold no responsibility for their content or their later changes.

Liability

You use the tools and information on this website at your own discretion. I work to keep every tool accurate, and I correct reported errors promptly. Send a correction to contact@ti-84calculator.com and I will check the tool myself.

Talha Kayani Owner and developer, ti-84calculator.com