About KitRoost

KitRoost builds the calculators that adult life keeps demanding and the internet never made. The job offer with four numbers on it. The daycare line item. The roof that gets 40 inches of snow. The invoice that says Net 30 and means business days. The wedding quote where the 25% surcharge lives in the footnotes.

Every tool here follows three rules:

• The math is shown. Every page opens its formula section, inputs, constants, and their sources. No black boxes.
• The data is public. Federal holiday calendars, Social Security bend points, FLSA overtime law, AVMA dog-age tables, state childcare surveys, 2026 wedding medians, Schengen Regulation 2016/1157. When a constant is an industry average (kibble density, catering ratios), it is labeled as one.
• It runs in your browser. No account, no tracking of what you calculate, no data leaves the page. Shareable links work by putting your inputs in the URL, the server never sees your numbers.

Why "niche tools"

The best tools are the ones you search for at 11 p.m. with a specific number in hand: "401k withdrawal $12000 penalty", "12 tons of gravel how many bags", "is 300 BTU/sqft right for a 1200 sqft attic". Google shows a blog post with 1,200 words of context before the number. KitRoost puts the number on the screen with the assumptions one click below it.

The catalog grows where the gaps are, money, home, family, events, travel, everyday, creators. If a calculation has a right answer and the internet buries it, it belongs here.

The fine print, honestly

These are educational estimates, not professional advice, the tax rows are effective-rate approximations, the engineering rows are code-threshold proxies, and the legal rows are plain-English summaries. For filing, bidding, building, and litigating, the professional number is the one that governs. Every tool's disclaimer names its specific limits.

Data corrections are welcome: report a number with its source, and the math-work section of the affected tool gets updated.