How we build every calculator on Kromo Tools.
Every tool starts from published, recognised sources, is tested against manual calculations, and is re-checked on a fixed schedule. If something looks wrong, tell us and we will look into it and fix it as soon as possible.
How a calculator gets built
Every tool on Kromo Tools goes through the same four checkpoints before it goes live.
Research
We start from published sources such as WHO guidance, the U.S. National Academies of Sciences, Engineering & Medicine, and peer-reviewed research, before writing a single formula.
Build & Test
Formulas are turned into working calculators, then tested against manual calculations and edge cases to catch rounding or logic errors.
Source Cross-check
Before publishing, we compare the formula, units and input limits once more against the original source to make sure nothing was misread.
Publish & Review
Once live, every tool is re-checked every 90 days, and sooner if a source guideline changes or a user reports a problem.
The sources we research from
Our health and nutrition calculators are based on published material like this.
We use these as references for our formulas. Each calculator page names the specific source its formula is based on. Kromo Tools is an independent website and is not affiliated with, reviewed by, or endorsed by any of these organizations.
How we keep tools accurate
The four responsibilities that sit behind every tool you use on Kromo Tools. Our team members choose to stay private and work under the Kromo Tools name, so you can always reach us through the report page below.
Finding the right source
Every formula is traced back to a published source, and we keep track of which source each calculator is based on.
Building & testing each tool
We turn formulas into working calculators and test them on different devices and with edge-case inputs so the numbers hold up.
Keeping it clear
We check wording, units and explanations so each page is easy to understand and does not overpromise.
Acting on your reports
When a user reports a bug through our report page, we review it and fix it as soon as possible. Some fixes take a little time, but every report gets checked.
How accurate are our tools?
Read about how formulas are checked, what the limits of each tool type are and why results are estimates.
