THE MATH OF
REALITY.
Save-Check tools aren't just calculators. They are calibrated utility engines built on globally recognized mathematical standards.
Finance & Tax
Our Salary and Budget engines use IRS-standard net pay models. We factor in FICA (Social Security & Medicare), federal income tax brackets, and standard deductions for 2026 projections.
Compound Growth
Savings calculations use the monthly compounding interest formula (n=12), allowing for monthly contributions and realistic year-end APY projections.
Sizing Standards
TV and Monitor viewing distances are based on SMPTE (Society of Motion Picture and Television Engineers) and THX standards for optimal field of view (30-40 degrees).
Unit Price Math
Calculations are resolved to the 4th decimal place. We normalize all inputs to a unified base (ounces, grams, or counts) to strip away deceptive packaging math.
Real-Time Odds
Lotto generators use a cryptographically secure pseudo-random number generator (CSPRNG) to simulate the true mathematical probability of specific draw formats.
Privacy First
No server-side processing. Your financial data is computed entirely in your browser's V8 engine and stored only in your local instance.
Transparency
is our priority.
No 'black box' algorithms. The math is clear.
Regularly updated to match new tax laws and standards.
Zero data collection. Your reality is your own.
Open to community review and feedback.
Our Data Sources
We don't guess. Our tools are hard-coded with values from the highest authorities in finance and technology. Here are the primary data sets used for our 2026 calibrations: