| What it does | Free online calculators for finance, health, salary, loans, and everyday decisions
| Construction calculators that show their math
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Amortization calculator with extra payment options
- Salary converter across 8 pay frequencies
- Mortgage calculator with taxes, insurance, PMI and HOA
- Compound interest calculator with monthly contributions
- Metric and imperial unit toggles
- Offline support via progressive web app installation
- Step-by-step guides explaining calculator formulas
- Mobile responsive design supporting 320px phones
- Nine language translations with right-to-left support
| - Every constant cited to ASTM, CMHA, or datasheet
- Two calculation methods shown separately
- Free and private, no account required
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| What makes it different | - Every calculator shows its formula and worked example so results can be verified
- All calculations run locally in browser with no data collection or account required
- Formulas traced to primary sources and tested against boundary cases before publication
- Independent editorial team accountable for accuracy with no guest posts
- Corrections treated as normal work with public revision dates
| - Every constant traced to named source and shown next to result
- Shows both methods when they disagree instead of averaging them
- Solves massive discrepancy in published block fill volumes
- Calculations run in browser with no data storage
- Built on version-controlled, auditable reference data modules
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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 | 8 ● no change since last check |
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| Trust Flow (Majestic) | 1 | 5 |
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| Citation Flow (Majestic) | 15 | 22 |
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| Referring domains (Majestic) | 3 | 7 |
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