| What it does | Free construction calculators for concrete, landscaping and home projects
| Time duration calculator for hours, minutes, and dates
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Square footage calculator for rooms, homes and lots
- Concrete calculator for slabs, footings, walls and columns
- Stair calculator with code checks for risers and treads
- Gravel and landscaping calculators for driveways and paths
- Roofing calculator for shingles and squares
- Deck calculator for boards, joists and screws
- Mulch calculator for garden beds in yards or bags
- Drywall calculator for sheets and screws
| - Calculate elapsed time between two times or dates
- Handle shifts that cross midnight
- Support for multiple time formats: h:mm:ss, decimal hours, and total minutes
- Account for daylight saving time with timezone selection
- Add up to 20 time spans together
- Run calculations in browser with no data storage
- Pre-calculated common work shifts for reference
- Calculate hours worked with unpaid break deductions
- Show results in multiple formats for different use cases
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| What makes it different | - Every formula is shown, tested and sourced
- Calculations run in your browser with no data sent anywhere
- All numbers come from named sources with citations and data sheets
- Independent and not affiliated with any manufacturer or retailer
| - All calculations verified against 100+ automated tests before each release
- Handles edge cases like midnight crossings, month-end dates, and daylight saving
- Built by a single developer who personally checks every result
- No server storage or tracking of user inputs
- Comprehensive methodology page explains all calculation rules
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 1 ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 5 | 1 |
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| Citation Flow (Majestic) | 11 | 18 |
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| Referring domains (Majestic) | 2 | 2 |
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CalcQuarry
Timespanly