Load Combination Calculator (LSD/LRFD)
Factored design load under IS/ASCE combinations — the governing case highlighted.
Factors aren't arbitrary: dead load is well known (small factor), live load uncertain (bigger). With lateral loads acting, gravity factors drop — loads rarely peak together.
Formula
Load Combination Calculator (LSD/LRFD) is a free load combination for structural engineers, fabricators and site engineers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Load Combination Calculator (LSD/LRFD)
Factored design load under IS/ASCE combinations — the governing case highlighted. The calculation implements IS 456: 1.5(D+L), 1.2(D+L+W), 1.5(D+W); ASCE: 1.2D+1.6L … (IS 456 Table 18; ASCE 7 ch. 2). Factors aren't arbitrary: dead load is well known (small factor), live load uncertain (bigger). With lateral loads acting, gravity factors drop — loads rarely peak together.
How to use Load Combination Calculator (LSD/LRFD)
- 1Enter Dead load effect in kN.
- 2Enter Live load effect in kN.
- 3Enter Wind/seismic effect in kN.
- 4Read IS: 1.5(D+L), IS: 1.2(D+L+W), ASCE: 1.2D+1.6L instantly — no submit button needed.
- 5Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Load Combination Calculator (LSD/LRFD)?
- ✓Implements the standard formula — IS 456: 1.5(D+L), 1.2(D+L+W), 1.5(D+W); ASCE: 1.2D+1.6L …
- ✓Reference cited on-page: IS 456 Table 18; ASCE 7 ch. 2
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Load Combination Calculator (LSD/LRFD) use?+
It computes IS 456: 1.5(D+L), 1.2(D+L+W), 1.5(D+W); ASCE: 1.2D+1.6L …, per IS 456 Table 18; ASCE 7 ch. 2. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Factors aren't arbitrary: dead load is well known (small factor), live load uncertain (bigger). With lateral loads acting, gravity factors drop — loads rarely peak together.
Can I use this for real structural design?+
It implements the exact textbook/code formula cited below the result and is ideal for sizing, checking and learning. Final designs should be verified by a qualified engineer against the full code with all load cases.
Is the Load Combination Calculator (LSD/LRFD) free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
Related Engineering tools
Reynolds Number Calculator
Compute Re from density, velocity, pipe diameter and viscosity — with instant laminar/turbulent classification.
● LiveLaminar vs Turbulent Flow Classifier
Classify hydraulic-oil or process-fluid flow regime from kinematic viscosity, line velocity and tube bore.
● LiveBernoulli Equation Solver
Solve downstream pressure between two points from velocities, elevations and fluid density (ideal, lossless).
● Live