| What it does | Date, deadline and time calculators with visible assumptions and sources
| Free personal finance calculators that show the real math behind the number
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| Stage | Not given
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| Founded | Not given
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| Based in | US
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - 184 calculators across 53 categories
- Shows counting rules and assumptions with each result
- Local-first processing with no data sent to servers
- Holiday and weekend calendar selection
- Business day counting
- Date arithmetic (add or subtract days, weeks, months, years)
- Sleep cycle planner with NIH-based 80-100 minute cycles
- Time zone conversion with DST handling
- Save results as images or add to calendar
- Schengen visa 90/180 day rolling window auditing
| - Debt Snowball vs. Avalanche calculator
- Student Loan Repayment calculator
- Credit Card Payoff Calculator
- Compound Interest Calculator
- Mortgage Refinance Calculator
- Retirement Catch-Up Calculator
- 401(k) Early Withdrawal Calculator
- 50/30/20 Budget Calculator
- Emergency Fund Calculator
- Hand-verified formulas with plain-English explanations
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| What makes it different | - Shows the source and counting rule beside every answer
- No sign-up or account required to use any calculator
- All inputs stay in your browser for privacy
- Comprehensive coverage across 53 life and work categories
- Higher-risk calculators include prompts to verify with professionals
| - Shows the actual math behind each calculation instead of a black box
- Every formula is hand-verified before publishing
- No signup, email wall, or spreadsheet download required
- Official figures checked directly against government sources
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 0 | 0 |
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| Citation Flow (Majestic) | 0 | 17 |
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| Referring domains (Majestic) | 0 | 1 |
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CalcSpan
TheCalcNerd