Free tools / OSHA Rate Calculator / Calculator
Calculate TRIR, DART, and the Form 300A summary.
Enter your year-end totals on the left. Rates + the Form 300A-shaped summary render on the right as you type. Your answers stay in your browser — nothing leaves your device.
Loading the interactive calculator… if this doesn't replace itself within a second, your browser may have JavaScript disabled. The formula reference shows the math.
Formulas use the BLS-standard 200,000 employee-hour constant (100 workers × 50 weeks × 40 hours). All math runs locally in your browser.