CrunchBench
About CrunchBench
CrunchBench is a free set of calculators for money, health, time and everyday math, in English, Spanish and Hindi. Every tool shows its inputs, result, formula and limits together, so you can see exactly what shaped the answer.
How the calculators work
Calculations run in your browser using the values you enter. There is no account or sign-up, and your inputs are not sent to CrunchBench.
- Loans and mortgages: standard amortization formulas with monthly compounding.
- Credit card minimums: that month's interest plus a percentage of the balance (1% by default), with a $25 floor; a flat-percentage rule is also available.
- US federal income tax: 2026 IRS standard deductions and ordinary-income brackets.
- Currency conversion: a dated European Central Bank reference-rate snapshot; the rate date is shown on every result.
- BMI: the conventional US (703 x lb / in²) and metric (kg / m²) formulas with CDC adult categories.
- Calorie and TDEE: the Mifflin-St Jeor equation for BMR, multiplied by activity factors from 1.2 to 1.9.
- Salary conversion: your own hours-per-week and weeks-per-year schedule.
Primary sources
- Internal Revenue Service (IRS) - 2026 tax brackets and standard deductions
- Consumer Financial Protection Bureau (CFPB) - mortgages, credit cards and loan disclosures
- European Central Bank - daily euro foreign exchange reference rates
- Centers for Disease Control and Prevention (CDC) - adult BMI categories
- Mifflin-St Jeor (1990) - BMR prediction equation, American Journal of Clinical Nutrition
- SAT (México) - ISR withholding tables for the Mexico net salary calculator
- Reserve Bank of India - loan and deposit references for the India calculators
Editorial process
Calculators and guides are written and maintained by the CrunchBench Editorial Team. Every calculator page shows its formula, a worked example, its assumptions and limits, the sources it relies on, and the date it was last reviewed. Formulas are checked against their primary sources before release and re-checked when tax years or reference data change.
Results are educational estimates, not financial, tax, legal or medical advice.
Corrections and contact
Found an error, or have an accessibility or advertising question? Email codechamps.us@gmail.com. Corrections are reviewed and the page's review date is updated when a fix ships. You can also request a calculator.
Policies
Last updated: October 25, 2026