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News & Updates
New calculators, feature improvements, and Malaysian standard revisions — all in one place.
Status: Public Beta (2026)
Last updated: 23 Apr 2026
CivilCalc.online now features 39 free calculators across 9 categories, all built on Malaysian standards. We are actively testing and refining — your feedback helps us improve!
Latest Updates
Recent changes and progress on CivilCalc.online.
23 Apr 2026
MSMA 2nd Edition alignment — 3 new stormwater calculators
- Audited every drainage calculator against MSMA 2nd Edition (2012). Replaced the IDF fitting constants (λ, κ, θ, η) with verbatim values from Table 2.B1 — the previous constants were mis-labelled across stations (e.g. the 'Kuala Lumpur' preset was actually carrying Johor Bahru's values). Expanded coverage to 13 major stations including Ibu Pejabat JPS, SK Kepong, Penang, Alor Setar, Kuala Terengganu, and Melaka.
- Fixed a material Time-of-Concentration bug: the overland sheet flow formula (MSMA Table 2.1) requires slope in PERCENT, not m/m. Entering 1 % as 0.01 was producing tc values roughly 5× too large. Variable relabelled from Manning's n to Horton's n* (MSMA Table 2.2) with the correct 0.015–0.060 range.
- Corrected the Culvert calculator reference from the non-existent 'Ch 36' to Chapter 18. Detention Pond reference moved from Ch 5 (OSD) to Ch 7.
- New: On-Site Detention (OSD) calculator — simplified procedure per MSMA §5.8.3 using Table 5.A1 Five Design Regions. Pick region + terrain slope + impervious %, get PSD (L/s) and SSR (m³) with linear interpolation across the 25/40/50/75/90 % impervious bands.
- New: Rainwater Harvesting Tank Sizing — MSMA Eq 6.1 (St = 0.01 × Ar) with AARY scaling from Table 6.4 for 17 Malaysian towns, plus first-flush volume from Table 6.3.
- New: Bioretention Filter Bed Sizing — MSMA Eq 9.1 / 9.2 with automatic Water Quality Volume (40 mm 3-month ARI), permeability values from Table 9.7, and 24-hour emptying-time validation.
- Added lib/msmaReferences.ts as a single source of truth for MSMA citations and data tables (Manning Table 2.3, Horton Table 2.2, runoff-C Table 2.5, OSD Table 5.A1, RWH Table 6.2/6.4, Bioretention Tables 9.6–9.7).
20 Apr 2026
Role tagging and UX audit fixes shipped
- Every calculator is now tagged as Consultant, Contractor, or both — filter the index by your role with the new 'I am a' selector, and see role chips on every card.
- Fixed IDF Rainfall Intensity: duration is now correctly converted from minutes to the MSMA HP1 published form (hours). Kuala Lumpur 10-yr / 60-min intensity now reads within the expected 70–90 mm/hr band (previously under-reported by a factor of ~30).
- New on-brand 404 page with a search box, 'Browse All Calculators' CTA, and a 'Report a broken link' shortcut that pre-fills the feedback form.
- Fixed broken URL /calculators/concrete/rc-beam — now redirects to the correct /calculators/concrete/beam-moment page.
- Every calculator now has a 'Reset inputs' button in the save bar to clear all fields at once.
- Each result card now shows a condensed BEM disclaimer line and a 'Calculated HH:MM' timestamp so you always know the result reflects your current inputs.
- Navigation now highlights your current section with an amber underline, and the homepage 'Explore Calculators' CTA is given clearer visual priority.
- Homepage 'Request a Calculator' card now opens the feedback form with the category and a request template pre-filled.
15 Apr 2026
Major Update — 17 new calculators deployed (36 total)
- New Geotechnical category: Bearing Capacity (Terzaghi/Meyerhof), Settlement Calculation, Slope Stability (FOS), Pile Capacity — all per MS EN 1997-1 and JKR guidelines.
- New QS/Costing category: Preliminary Cost Estimate (PCE), Build-up of Rates, Variation Order (VO), Tender Evaluation, Interim Payment Certificate (IPC), Final Account Summary — per BQSM, JKR SMM2, PWD 203A, and MOF procurement guidelines.
- New Environmental category: Water Demand Calculation (SPAN guidelines) and EIA Screening Checklist (DOE EIA Order 2015).
- New Structural tools: RC Slab Design (one-way & two-way per EC2) and Deflection Check (span/depth ratio per EC2 Cl. 7.4.2).
- New Roads tools: Sight Distance Calculator (SSD & OSD), Road Gradient & Curve Design, Traffic Volume (PCU) & LOS — per JKR ATJ 8/86 and REAM.
- Updated homepage, category pages, footer navigation, and standards trust bar to reflect all 36 calculators across 9 categories.
23 Mar 2026
Project kick-off — 19 initial calculators launched
- Launched 19 calculators covering drainage (MSMA 2nd Ed), earthworks (JKR), roads (ATJ 5/85), sewerage (MSIG/SPAN), and structural (MS EN 1992-1-1).
- Implemented shared input/output layout with save/load, PDF export, and cloud sync.
- All calculators include Malaysian standard references, key terms, and PE disclaimer per BEM requirements.
What’s Coming Next
Planned features and improvements on our roadmap.
Retaining wall design calculator (MS EN 1997 / BS 8002).
Staircase design calculator (EC2 slab method).
Bill of Quantities (BQ) generator from calculator results.
Community-contributed calculators with PE review workflow.
Mobile-responsive improvements and offline mode (PWA).
Help Shape CivilCalc.online
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