About SolveKit

SolveKit is a small, independent collection of 48 specialist calculators for science, the workshop and the kitchen. Every one of them runs entirely in your browser, works in both directions, and shows its working.

Who writes it

Dr. Priya Nair is a science writer and former university physics lecturer based in Ann Arbor, Michigan. Priya spent more than ten years teaching introductory mechanics, electromagnetism and laboratory methods to first- and second-year undergraduates — long enough to notice that students rarely struggled with the formulas themselves. What tripped them up was rearranging equations, keeping units straight and knowing when an approximation stopped being valid.

SolveKit grew out of the worksheets written for those classes. Each calculator states its model and its limits plainly, uses the same worked-example style as the whiteboard sessions, and links to open textbooks and government data so readers can check the source instead of taking a number on trust. Priya writes the explanations, chooses the reference values and reviews every calculator before it is published.

How the calculators work

Each calculator is defined as a set of equations between named quantities. When you fill in some fields, a solver propagates through the equations: any equation with exactly one unknown is solved for it, and the process repeats until nothing else can be determined. If you enter more values than the system needs and they disagree, the value you edited least recently is recalculated, so your latest input always wins.

• Units are converted with the exact factors published by NIST in Special Publication 811 and Handbook 44. All arithmetic happens in SI units internally.
• Statistics functions (the normal distribution and its inverse) use published double-precision algorithms accurate to about 15 significant digits.
• Testing: every calculator has automated tests that check a textbook reference case and then solve for each variable in turn, plus every independent combination of inputs, confirming that the answer comes back to the same point. Browser tests then check the live page in both a forward and a reverse direction.

Corrections

If you find an error, an unclear explanation or a reference value you disagree with, please write to hello@omnicalculatortool.com with the page and the inputs you used. Confirmed errors are fixed and the page's "Updated" date is changed.

What SolveKit is not

The calculators are for education, planning and quick checks. They are not a substitute for a structural engineer, a laboratory's validated procedures, a statistician reviewing a study design, or food-safety guidance from your local authority.

Independence

SolveKit (omnicalculatortool.com) is an independent calculator site. It is not affiliated with, sponsored or endorsed by Omni Calculator sp. z o.o. All product names are trademarks of their owners.

SolveKit carries no advertising trackers and no third-party scripts. See the privacy policy for details.