| What it does | Free exact age calculator in years, months and days for educators, clinicians and parents
| Free one rep max calculator with seven formulas and percentage charts
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| Pricing model | Free
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| Pricing | Not given
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| Key features | - Instant calculation of exact age in years, months, and days
- Multiple output formats including test format (Y;M;D), decimal years, total days, weeks, and hours
- Automatic leap year handling
- Exact month length calculation using actual days per month
- Custom reference date selection for past or future dates
- No registration or sign-up required
- Browser-based calculation with no data storage
- Clean interface without ads or clutter
- Results in standardized test format
| - Seven 1RM formulas (Epley, Brzycki, Lombardi, Lander, Mayhew, O'Conner, Wathen)
- Average of all formulas as recommended result
- Percentage chart from 100% to 50% of 1RM
- Rep-max table for 1RM through 12RM
- Support for kilograms and pounds
- Exercise-specific formula defaults
- RPE adjustment for reps in reserve
- Multiple exercise categories (chest, back, legs, shoulders, arms, Olympic)
- Browser-based history with no account
- Warm-up sets calculator and rep-max table
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| What makes it different | - Built specifically for professionals who need accurate age calculations for standardized assessments and school placement decisions
- Completely private with all calculations done in your browser and no data collection
- Handles edge cases that trip up manual calculation like leap years and month-end dates
- Free alternative to discontinued publisher tools that professionals previously relied on
| - Uses seven published formulas instead of one, showing average and range for transparency
- No account, sign-up, or data storage required
- Covers dozens of exercises with exercise-specific guidance and lift variations
- Warns about formula accuracy limits and when estimates are unreliable
- Includes linked tools for related calculations (DOTS, Wilks, training max, FFMI, VO2)
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 11 ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 3 | 0 |
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| Citation Flow (Majestic) | 20 | 0 |
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| Referring domains (Majestic) | 59 | 0 |
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Chronological Age Calculator
OneRepMax