Ergonomics · Origin RNLE worksheet
Use the NIOSH origin lifting worksheet with verified multipliers
Calculate an origin recommended weight limit and lifting index using measured geometry and verified multipliers.
By HSECalc · Published
Check that this method fits your task
For an applicable two-handed, single lifting task. Not for one-handed, seated, kneeling, unstable-load or carrying tasks. FM and CM must be selected from the NIOSH manual; this tool does not select them for you.
Choose your inputs and work through the steps
- Check RNLE applicability before measuring the task. This page supports an origin assessment for a two-handed single lifting task, not every manual-handling activity.
- Measure load, reach, origin and destination heights, and origin asymmetry. Select FM and CM from the manual for the actual frequency, duration, recovery, grip and height.
- Calculate origin RWL and LI. If significant destination control is required, assess that position separately using its own correct inputs.
RWL = 23 kg × HM × VM × DM × AM × FM × CM. LI = load / RWL. H below 25 cm uses 25; travel below 25 cm uses 25. The origin geometry is assessed only.
A worked example
Illustrative values explain the tool; they are not prescribed inputs for your work.
- With H=25 cm, origin V=75 cm, destination V=100 cm and A=0°, the illustrated geometry multipliers are 1.
- For this fictional applicable task, verified FM=1 and CM=1 give RWL = 23 kg.
- A 15 kg load gives LI = 15 ÷ 23 = 0.65. Example multipliers are not defaults for real work.
Read the result and decide what needs checking
FM is a multiplier, not lifts per minute. A guessed value can make the result look reassuring while representing the wrong task.
An LI below one is not a safety certificate. Check applicability, destination handling and hazards the equation does not represent; use a full ergonomic assessment where needed.
Common questions
Does LI below 1 mean safe?
No. Applicability, destination control, worker factors and other hazards still need assessment.
Why enter FM manually?
Correct selection needs frequency, duration and recovery information. Use the linked manual; a guessed multiplier gives a misleading answer.
Can I assess the destination too?
Where destination control is significant, perform its assessment separately with the correct destination geometry and multiplier selections. Use the lower RWL to assess the lift.
References and scope notes
- NIOSH RNLE overview
- NIOSH applications manual: methods, applicability and multiplier tables
- CCOHS: metric multipliers and definitions
Use the current official guidance and the instructions for your actual equipment. HSECalc is independent; a reference is not an endorsement. Read how we use methods and sources or report a correction.