myAbout MyToolkit
An independent, ad-supported toolkit built by developers who believe free tools should actually be free — no sign-ups, no data harvesting, no dark patterns.
The story behind MyToolkit
MyToolkit was started by a small team of independent developers and designers who were tired of the state of free online tools. Most tool sites had become bloated with pop-ups, aggressive upsells, and dark patterns engineered to harvest emails rather than help users. Results on search engines were increasingly dominated by sites that looked helpful but buried the actual tool three scroll-lengths below an ad wall.
We set out to build the site we actually wanted to use: fast, clean, private, and genuinely free. No account required. No upload required. No nag screens. Open the tool, use it, leave — or stay and use another one.
MyToolkit is independently owned and operated. We have no investors, no acquisition ambitions, and no ad-tech partners beyond Google AdSense. The site's business model is simple: serve ads on pages, use that revenue to keep the site running and adding tools. That's it.
Our editorial and accuracy standards
Every tool on MyToolkit is built against a named, documented formula or standard. We do not invent methodology. For health tools, we use established clinical equations. For financial tools, we use standard banking mathematics. For unit conversions, we use SI definitions and published international standards.
Each tool page links or describes its formula source, so you can verify the calculation independently. Where a formula has known limitations (for example, BMI not accounting for muscle mass, or BMR equations having varying accuracy across populations), we note them.
If you find an error in any calculator — a wrong result, an outdated formula, or a boundary condition that isn't handled — please report it via our contact form. We take accuracy reports seriously and typically investigate within 24 hours.
Formulas and sources by category
The table below summarises the primary formulas and standards used across MyToolkit's tool categories. This is provided for transparency so users and researchers can verify our calculations independently.
| Category / Tool | Formula / Standard | Notes |
|---|---|---|
| BMR Calculator | Mifflin-St Jeor equation (1990) | Preferred over Harris-Benedict for general populations. TDEE multiplied by PAL factor. |
| Body Fat Calculator | US Navy circumference method | Estimates body fat % from waist, neck, and height. Not a DEXA replacement. |
| BMI Calculator | WHO BMI classification | BMI = kg/m². WHO adult thresholds used. Limitations noted on tool page. |
| Loan / Mortgage | Standard amortisation formula | M = P·[r(1+r)^n] / [(1+r)^n−1]. Compound interest at monthly frequency. |
| Compound Interest | A = P(1 + r/n)^(nt) | User-selectable compounding frequency. Real rate adjusted for inflation where shown. |
| Unit Converter | SI / NIST definitions | Base conversion factors from NIST Handbook 44 and ISO 80000. |
| Car & Vehicle | Declining balance depreciation; standard loan amortisation; 20/4/10 affordability rule | Standard automotive finance and depreciation formulas. |
| Hash Generator | Web Crypto API (browser-native) | SHA-1, SHA-256, SHA-512 via SubtleCrypto. MD5 via pure-JS fallback. All client-side. |
| GPA Calculator | US 4.0 letter-grade scale | Standard A=4.0, B=3.0 etc. Weighted by credit hours. |
| Standard Deviation | Population (σ) and sample (s) formulas | Uses n for population, n−1 (Bessel's correction) for sample std dev. |
Important: All MyToolkit results are for informational and educational purposes only. Health tools do not constitute medical advice. Financial tools do not constitute financial advice. Always consult a qualified professional before making medical, financial, or legal decisions based on any calculator output.
What we commit to
How MyToolkit is funded
MyToolkit is free to use and always will be. The site is funded entirely by Google AdSense advertising — contextual display ads that appear on tool pages. This is the only revenue source.
We do not participate in:
- Affiliate marketing or referral schemes
- Sponsored tool results or paid placements
- Data brokering, lead generation, or email list sales
- Subscription tiers, paywalls, or "pro" versions
- Venture capital or external investment
Ads are served by Google based on page content and your own Google ad preferences — not on personal data collected by us. You can review or opt out of Google's ad personalisation at adssettings.google.com.
The "Ad" label you see on the sticky bottom bar is the ad unit. That's the only advertising on the site — no native ads disguised as content, no interstitials.
Privacy commitment
The vast majority of MyToolkit tools run entirely in your browser. Nothing you type into a calculator or converter is ever transmitted to our servers. For tools that process files (Privacy Blur, Image to Base64), all processing happens locally on your device.
The only data we receive is standard web server logs (IP, page requested, referrer, browser) which are retained for 30 days, and Google Analytics data used for aggregate traffic analysis. No individual profiles are built or retained. You can read the full details in our Privacy Policy.
Recent updates
Contact & feedback
We genuinely read every message. If you've found a bug, spotted an inaccurate formula, have a tool suggestion, or want to report a concern, use the contact form. We typically respond within 2–3 business days.
For press enquiries, partnership requests, or tool licensing questions, use the same contact form and select the relevant subject.