Site safety

By the Plankley team · Last checked 19 October 2026

Calculators

Silica dust exposure calculator
Example: Reached the legal limit. Daily exposure 0.188 mg/m³ (8-hour TWA), 188% of the WEL
Gradient and fall calculator
Example: 1:60 = 1.67% = 0.95° = 16.7 mm per metre; drop 50 mm
Hand-arm vibration (HAV) exposure points calculator
Example: 100 points today: reached the exposure action value: action is needed to reduce exposure
Carpentry
Ramp gradient calculator
Example: Going: 4.50 m at 1:15
Job labour time and cost estimator
Example: About 1 day on site, 2 person-days of labour
Noise exposure calculator
Example: Daily noise exposure LEP,d 89.0 dB(A): at or above the upper exposure action value
Scaffold hire estimator
Example: About 5 bays and 3 lifts: 60.0 m² of scaffold face to describe to a scaffolder

Patio estimator
Plan a patio from dig to jointing: muck away, sub-base, slabs, bedding mortar and the fall, in one printable shopping list.