Ad-light browsing
Support helps keep the site from depending on intrusive ads above the calculator, result, formula or proof.
Support CalculationTime
Help keep the public calculator library free, transparent and maintained without pushing intrusive ads above the calculator, result, formula or proof.
Why this page exists
Free calculators still need upkeep.
A reliable calculator is not just a form and a number. It needs clear defaults, tested edge cases, readable explanations, mobile polish, accessible controls, hosting, monitoring and ongoing corrections when rules, rates or user needs change.
Support lets CalculationTime build for usefulness first: transparent calculations, visible proof, clean reports and maintained pages people can return to. The scale is small, so even a low yearly supporter payment genuinely helps.
Supporter perks
What support protects and improves.
Clearer proof
Funding makes room for formulas, examples, assumptions, source notes and step-by-step checks that make answers easier to trust.
Cleaner printouts
Supporter funding helps improve printable reports, export views and clean copies people can save, share or attach.
Ongoing maintenance
Support pays for fixes, mobile QA, refreshed defaults, citation reviews and new calculators as rules or user needs change.
What is in it for me?
The public library stays open. Supporters help it stay good.
| Feature | Visitor | Supporter |
|---|---|---|
| Calculator answers and formulas | Included | Included |
| Assumptions and method notes | Included | Included |
| Printer-friendly reports where available | Included | Included |
| Early supporter updates | - | Included |
| Ad-light development priority | - | Included |
| Supporter-only downloadable extras when released | - | Included |
| Influence on what gets built next | Feedback only | Priority feedback |
Simple support options
A small yearly subscription helps keep calculators free.
Stripe checkout is being prepared, so these buttons open email for now. The intended setup is one US$5.99 yearly supporter subscription and one US$29.99 founding lifetime supporter payment.
What your support funds
Support the work behind trustworthy calculators.
- Hosting and uptime for the calculator library
- Browser and mobile visual QA before releases
- Source review, methodology notes and proof work
- New calculators across finance, construction, dates, time and unit conversion
- Printable reports, export tools and original time experiments
- Less pressure to fill calculator pages with intrusive advertising
FAQ
Questions before payments go live.
Will calculators stay free?
Yes. Support is meant to help keep the public calculator library useful, not hide the core answers.
Does support influence calculator results?
No. Support never changes formulas, rankings, defaults, examples, source notes or accuracy claims.
Why does this start with email instead of checkout?
The page is live before the payment system. That lets the US$5.99 yearly support ask exist now while checkout is added carefully.
Will there be a lifetime option?
Yes. The founding lifetime supporter option is planned as a once-only US$29.99 payment before the real checkout link is published.