Built by operators,
for operators
CalStack is a network of free professional calculators built for people who run real businesses. Every tool includes industry benchmarks so you get context with your number — not just a calculation.
Why CalStack exists
Most online calculators give you a number. CalStack gives you a decision. The difference is context — knowing whether your food cost percentage is healthy, warning, or critical for your specific restaurant type changes what you do next.
The idea came from seeing operators make avoidable mistakes because they lacked access to the same benchmarking data that larger, better-resourced businesses use as standard practice. CalStack makes that data freely accessible to every operator, regardless of size.
What we build
Every calculator on CalStack is built around three principles:
- Hyper-specificTools built for a specific industry and use case, not generic formulas that apply to everything and nothing.
- Benchmark-drivenEvery result is contextualised against real industry data so you know what your number means.
- Free foreverThe core calculators are free, always. No account required, no limits on use.
Editorial standards
All content on CalStack is written and reviewed to a consistent editorial standard. Benchmarks are sourced from primary industry bodies — the National Restaurant Association, the Uniform System of Accounts for Restaurants, Cornell University's Center for Hospitality Research, and equivalent authorities in each industry category.
Fact-checking process: Every calculator page is reviewed for mathematical accuracy, benchmark currency, and content clarity before publication. Sources are cited with direct links wherever available. If you find an error or an outdated benchmark, contact us and we will review and correct within 48 hours.
Who is behind CalStack
CalStack is built and maintained by Tim Guruge, a developer and product builder focused on tools for the creator economy and professional operators. The site is built with a static architecture — no database, no server-side rendering, just fast HTML and a JSON data layer — which means every calculator loads instantly on any device.
CalStack is an independent project. It is not affiliated with any of the industry bodies cited as sources.
Contact
For benchmark corrections, calculator requests, partnership enquiries, or anything else — email [email protected]
CalStack Editorial
Every calculator page is reviewed for mathematical accuracy, benchmark accuracy, and content clarity before publication. Benchmarks are checked against primary industry sources annually.