Our Methodology
Every ShouldICalc calculator is built on real data from trusted sources. Here's how we ensure accuracy and transparency.
Our Data Sources
We pull data from authoritative sources including:
Government Sources
- Bureau of Labor Statistics (BLS) - Wages, inflation, consumer spending
- U.S. Energy Information Administration (EIA) - Electricity rates, fuel costs
- Internal Revenue Service (IRS) - Tax rates, deductions, credits
- Federal Reserve - Interest rates, economic data
- NHTSA - Vehicle safety and fuel economy data
Industry Sources
- EnergySage - Solar panel costs and savings
- Kelley Blue Book - Vehicle values and depreciation
- Zillow Research - Housing market data
- AAA - Driving and fuel costs
- NerdWallet - Financial product comparisons
How We Build Calculators
1. Research Phase
We identify the key factors that affect each decision. For example, an "EV vs gas car" calculator needs: purchase price, fuel costs, electricity rates, maintenance differences, tax credits, and depreciation.
2. Data Collection
We gather current data from our trusted sources. We prioritize government data when available, supplemented by industry reports and consumer research.
3. Formula Development
We create calculation formulas that are:
- Transparent - You can see what factors we're considering
- Conservative - We don't oversell savings
- Adjustable - You input your real numbers, not averages
4. Range-Based Results
We show ranges (best case to worst case) rather than single numbers. Life is variable—your actual results will depend on many factors. We'd rather give you realistic expectations than false precision.
5. Regular Updates
We review and update calculator data regularly:
- Price data (gas, electricity, groceries): Monthly or as markets change
- Tax information: Annually when new rates are published
- Full calculator review: At least once per year
What We Don't Do
- We don't make up numbers. Every default value comes from real data.
- We don't hide assumptions. Our trade-offs section shows what we're considering.
- We don't oversell. If the savings are modest, we say so.
- We don't give personalized financial advice. Our calculators are educational tools, not professional guidance.
Limitations
Our calculators have limitations we're transparent about:
- Averages vs. your situation: Default values are national averages. Your local costs may differ.
- Simplifications: We can't model every variable. We focus on the factors that matter most.
- Time sensitivity: Prices change. While we update regularly, data may not reflect today's exact prices.
- Not professional advice: For major financial decisions, consult a qualified professional.
Affiliate Relationships
Some calculator pages include Amazon affiliate links. These never influence our calculations or recommendations. We recommend products based on relevance and value, not commission rates. Our calculators would show the same results whether or not affiliate links existed.
Read our full affiliate disclosure →
Feedback & Corrections
Found an error or have a suggestion? We want to hear it. Our goal is accuracy, and we'll correct mistakes promptly.
Questions?
If you're curious about how a specific calculator works or where we got a particular data point, reach out. We're happy to explain our methodology for any calculator.