Construction Calculators
The Biggest Selection of Construction Tools Available
Free interactive calculators for health & safety, temporary works, earthworks, materials, plant, programme, commercial, environmental, utilities, surveying, quality & testing, training, water & wastewater, and MEICA. Built for site supervisors, foremen, engineers, and safety professionals. Based on HSE methodologies and UK regulations.
Manual Handling Risk Score Calculator
Score manual handling tasks using HSE MAC and RAPP methodologies. 120+ task library, HSE colour-coded scoring, suggested controls, re-score workflow, and professional PDF.
Fire Risk Score Calculator
Score fire risk on construction sites using PAS 79 methodology and the Fire Safety Order 2005. Three site types, 5×5 risk matrix, section scoring with regulatory references, auto-generated action plan, and professional PDF export.
HAV Exposure Calculator
Calculate hand-arm vibration exposure using the HSE points method per the Control of Vibration at Work Regulations 2005. 151-tool library with multi-operative daily and weekly logging, EAV/ELV traffic light scoring, magnitude override, and per-operative PDF assessment.
Confined Space Category Calculator
Calculate the confined space risk category (NC1 Low Risk through to NC4 High Risk with Rescue) using a weighted scoring system covering specified risks, depth, access, ventilation, atmosphere, and communication. Full requirements checklist with C&G 6160 qualification mapping.
WBGT Heat Stress Calculator
Assess heat stress risk using ISO 7243 Wet Bulb Globe Temperature. Enter conditions directly or estimate from basic weather data. Work/rest ratios, daily and weekly planners, 19-control action plan database, and professional PDF assessment with sign-off.
Welfare Facilities Calculator (CDM 2015)
Calculate minimum welfare facility requirements per CDM 2015 Schedule 2, HSG150, BS 6465.
Dust & Silica Exposure Calculator (COSHH)
Calculate RCS and dust 8-hour TWA exposure per COSHH 2002, EH40/2005, HSE INDG463.
Noise Exposure Calculator (LEP,d)
Calculate daily personal noise exposure LEP,d per Noise at Work Regs 2005, HSE L108, ISO 9612.
Slip Risk Assessment Calculator
Score slip risk for surfaces and walkways per HSE GEIS2. 74 surface types, multi-zone, control measures.
UV Index Exposure Checker
Calculate UV index exposure for outdoor construction workers using solar position equations and WHO/WMO data. 35 UK cities, hourly UV chart, cumulative SED tracking against HSE 2 SED/day threshold, Fitzpatrick skin type burn time estimates, PPE protection comparison, and professional PDF export.
Cold Stress Wind Chill Calculator
Calculate wind chill temperature using the North American Wind Chill Index formula. Frostbite time thresholds, hypothermia risk assessment, CSA Z1004-12 clothing requirements, interactive heatmap matrix, and professional PDF export.
Lone Worker Risk Score Calculator
Score lone worker risk using HSE INDG73 methodology with multiplicative risk model. 8 weighted risk factors, radar chart, risk gauge, what-if comparison, BS 8484 device recommendations, pre-start checklist, and white-label PDF export.
Fatigue Risk Calculator (Shift Patterns)
Assess shift pattern fatigue risk using the HSE RR446 model. Weekly or rotation patterns up to 28 days, fatigue index chart, cumulative sleep debt tracking, relative risk multipliers, Working Time Regulations compliance, preset patterns, and professional landscape PDF export.
First Aid Needs Assessment Calculator
Calculate minimum first aid requirements per HSE L74. FAW/EFAW ratios by risk level, shift coverage matrix, BS 8599-1:2019 kit checklist, AED recommendations, supplementary equipment for specific hazards, optional current provision comparison, and professional PDF export.
Working at Height Risk Score Calculator
Calculate working at height risk scores per WAHR 2005, CDM 2015, and BS 8437. 15 task types, 7 weighted scoring factors, interactive control hierarchy with residual risk, detailed equipment recommendations, radar and bar charts, method statement and rescue plan checklists, and white-label PDF export.
RIDDOR Reporting Decision Tool
Determine whether a workplace incident is reportable under RIDDOR 2013. Comprehensive decision tree covering deaths, specified injuries, over-7-day incapacitation, dangerous occurrences (full Schedule 2), occupational diseases (full Schedule 1), and gas incidents (GSIUR 1998). Deadline calculator, HSE contacts, responsible person guidance, and professional PDF export.
Asbestos Notification Decision Tool
Determine whether planned work requires an HSE-licensed asbestos contractor, ASB5 notification, or 4-stage clearance under CAR 2012. Comprehensive decision tree covering all ACM types, survey requirements, licensed/NNLW/non-licensed classification, duty holder responsibilities, ASB5 form field checklist, and professional PDF export.
Site Induction Duration Calculator
Calculate recommended site induction duration based on UK construction industry best practice. 5 project types, 3 induction types, 20 site hazards, CDM module, client bolt-ons (max 60 min). No legislation specifies induction duration. Generates agenda breakdown, refresher schedule, and white-label PDF export.
Fire Extinguisher Selector
Select, size, and position portable fire extinguishers per BS 5306-8:2012 and RRFSO 2005. Multi-area assessment with 13 premises types, 10 fire risk categories, 7 extinguisher types with full size databases, fire class suitability matrix, siting coverage calculations, signage schedule (BS 5499-1), inspection checklist (BS 5306-3), and professional white-label PDF export.
Temporary Traffic Management Selector
Select and configure temporary traffic management layouts per Chapter 8 Traffic Signs Manual and Safety at Street Works Code of Practice 2013. 9 road types from motorway to private estate, 14 works locations, 19 TM layouts with schematic diagrams, signing distances and taper lengths per speed, cone spacing, NHSS 12A/12B qualification guidance, NRSWA notice period calculator, 7-factor complexity scoring with radar and bar charts, 32-point deployment checklist, layout comparison table, and white-label PDF export.
Working Time Regulations Calculator
Check compliance with the Working Time Regulations 1998. Analyse shift patterns for maximum weekly hours, night worker limits, rest breaks, daily and weekly rest periods, and annual leave entitlement. Full under-18 young worker rules, opt-out validity guidance, and RAG-rated corrective actions with PDF export.
Ladder / Stepladder Justification Tool
Work through the HSE hierarchy of access equipment to determine whether a ladder or stepladder can be justified. WAHR 2005 Reg 6 compliant decision tree -- Eliminate, MEWP, Scaffold, Tower, Podium, Hop-up, Stepladder, Leaning Ladder. Tailored pre-made reasons per option plus custom reason, full audit trail, pre-use checklist, and PDF export.
F10 Notification Checker
CDM 2015 reg 6 F10 notification decision tool for UK construction projects. Covers the reg 6(1) notifiability thresholds (30 working days, 20 simultaneous workers, 500 person-days), reg 6(2) update triggers, reg 7 domestic client duty transfer, and reg 6(4) site display obligations. Auto-computed person-days, countdown timeline from planned start date, F10 field checklist cross-referenced to CDM 2015 Schedule 1, HSE portal reference, and professional white-label PDF export including an integrated A4 site display stub.
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