StashGrid is built and maintained by Steven Browning, a support and service management professional based in North Carolina. Every tool on the site is written and tested by hand rather than assembled from third-party widgets.

Do I need an account to use the tools?

No. There are no accounts, no sign-ups, and no paywalls. Every tool works immediately in your browser.

Are my inputs stored anywhere?

No. Calculations run in your browser using JavaScript. Salary figures, loan amounts, health measurements and pasted text never reach StashGrid's servers.

How are the calculators checked for accuracy?

Formulas are checked against published standards and worked against sample scenarios with known answers. Tools that depend on reference data, such as tax tables, are audited against the published source when rates change, and tools fed by live data have automated freshness monitoring that flags stale figures.

What should I do if a calculator gives a wrong answer?

Report it through the contact page with the inputs you used. Errors are corrected promptly and the tool's version marker is updated.

About StashGrid

Q: How is StashGrid funded?

Through advertising and, on some pages, affiliate links which are disclosed where they appear. Commission never influences a calculation: results come from the formula and your inputs.

Free calculators and browser tools that answer everyday questions quickly — no account, no app, no paywall.

Last updated: September 10, 2026

Who builds this

StashGrid is built and maintained by Steven Browning, a support and service management professional based in North Carolina. It is a one-person project, not an agency or a content farm, and that is deliberate: every tool here was written and tested by hand rather than assembled from third-party widgets or generated in bulk.

The background is technical rather than financial. Work in support and service management means dealing daily with systems where a wrong number causes a real problem downstream, and where the fix depends on being able to trace how the answer was produced. That is what shapes how these tools are built — transparent formulas, checkable working, and monitoring that catches bad data before a visitor sees it.

What that background is not is a licensed financial advisor, accountant, or medical professional. That is stated plainly here and in the disclaimer, because a calculator that touches your paycheck or your debt should be honest about what stands behind it.

Why the site exists

Most everyday calculations — what a loan actually costs once the rate is applied, what lands in your account after withholding, how long a debt takes to clear — are simple arithmetic wrapped in bad interfaces. The versions online tend to demand an email address, bury the answer under a lead-capture form, or refuse to show the formula so you cannot check the result.

StashGrid is the opposite of that arrangement. The tool loads, you type, you get an answer, and where it is useful the page shows you the formula so you can verify it yourself or spot when a bank's number and this one disagree.

How the tools are built

Everything runs in your browser. Calculations are JavaScript executing on your own device. Your inputs are never transmitted to StashGrid — see the privacy policy for the detail.
Formulas are shown, not hidden. Where a calculation has a standard published formula, the page explains it in plain English so the result can be sanity-checked rather than trusted blindly.
No sign-up, no paywall, no upsell. The tools are funded by advertising rather than by collecting your email address.
Nothing is sold on. Personal information is not sold or shared with data brokers.

How accuracy is handled

A free calculator is only worth using if the number is right, so verification is treated as part of building rather than an afterthought.

Formula verification

Calculations are checked against published standard formulas and run against sample scenarios with independently known answers. Where a tool has been rebuilt, the new version is validated against the old one on identical inputs before it replaces it.

Reference data audits

Tools depending on published reference data — most obviously the paycheck calculator, which models withholding across all fifty states — are audited against the published source when rates change rather than left to drift silently between tax years. Tax data going stale is the most common failure mode for calculators of this kind, and it is the one most invisible to a visitor.

Live data monitoring

Several tools display data refreshed automatically: lottery results, component pricing, cryptocurrency figures. Each of those feeds is monitored on a schedule, and stale data raises an alert rather than being served quietly as though it were current. Pages driven by live data show a "last updated" timestamp so you can judge for yourself.

Corrections

Mistakes get made. When one is reported or found, the tool is fixed and its version marker updated. If a calculator here produces a result you believe is wrong, please report it here and include the inputs you used — a reported error is worth considerably more than an unreported one.

What these tools are not

StashGrid is for estimation and education. The finance tools do not know your credit profile, your lender's underwriting rules, your exact filing status, or your local taxes. The health tools do not know your medical history. A calculator here is a good way to understand the shape of a problem and to check somebody else's arithmetic; it is not a replacement for a professional who can assess your actual circumstances. The disclaimer covers this tool by tool.

How StashGrid is funded

Through advertising, and on some pages through affiliate or referral links which are disclosed where they appear. Commission never influences a calculation — a result comes from the formula and the numbers you entered, and nothing else. An ad on a page is not an endorsement of what it advertises.

Common questions

Do I need an account?

No. There are no accounts, no sign-ups, and no paywalls anywhere on the site.

Are my inputs stored?

No. Calculations happen in your browser. Salary figures, loan amounts, health measurements and pasted text never reach StashGrid's servers. Some tools remember your last-used settings in your browser's local storage, which stays on your device and can be cleared at any time.

Can I use the results commercially?

Yes. The results are yours to use however you like, including at work. See the terms of use for the small print.

Can I embed a tool on my own site?

Ask through the contact page. It is usually straightforward to arrange.

Is there a related project?

Yes — StashGrid.ai covers AI workflow resources and automation work.

Get in touch

Corrections, tool requests, embed enquiries and anything else: send a message from the contact form. Tool requests genuinely do influence what gets built next.