CALC
Tools online · Green Stories LLC · Newark, NJ
22 calculators · 2 Revit add-ins · $0
§00 — Tools / utilidades / ferramentas

The calculators we built for OURSELVES.

Twenty-two calculators, one Revit plugin, and a methodology index. Everything cited back to NJAC, IBC, ACI, ASCE, NEC, NSPC, IFGC, and the local ordinances we actually work under. We built them for our own projects — and kept them free because someone else might need them too.

22 Calculators
2,387 Windows indexed
9 Code bodies cited
$0 Price of entry
RohoSuite · Advanced Add-ins

Revit Plugins.

Beta · Revit 2026 plugin

AnansiBuild for Revit.

Export architectural BIM models to multi-color 3MF files for desktop 3D printing. Automatic 18-category material separation, glass and frame detection, section box clipping, model slicing, and thin geometry inflation. Slicer-ready for Bambu Lab and other FDM printers.

HostRevit 2026 · .NET 8
Output3MF multi-color
SlicerBambu · Orca · Prusa
Published underRohoSuite
Explore AnansiBuild →
ANANSIBUILD · PIPELINE v0.9 · BETA
Input BIM .RVT
→
Output 3MF Multi-color
Wow
← ↓
Result 3D Print
18 material categories — auto-separated
Commercial Beta · Revit 2025-2027

RohoFlow for Revit.

BIM-linked stormwater runoff analytics, dynamic Toposolid/Topography LAG elevation polling, concrete paved walkway limits segregation, and automatic sheet-ready NJAC schedule generation.

HostRevit 2025-2027 · .NET 8
CalculationsRational Q = CIA · GSR-32
Gravity PipesManning Velocity (2.5-10.0 FPS)
Published underRohoSuite
Explore RohoFlow →
ROHOFLOW · ANALYTICS v1.0 · NJAC 7:8
CATCHMENT SEGREGATION
ON-SITE PAVING 8,450 SF Sized for Detention
OFF-SITE PUBLIC ROW 1,240 SF Excluded (Comments Filter)
HYDRAULIC PIPELINE
1. EXTRACT LAG 104.2' Toposolid / Topo
→
2. SIZE 4.8 FPS Manning Gravity
→
3. BUILD 6" PVC @ 1.5% Revit Pipe Element
NJAC 7:8 COMPLIANCE VERIFICATION
• Volumetric Runoff Reduction
• 72-Hour Infiltration Drawdown
• Newark §41:17 Water Quality
• Shared Parameter Writeback
§03 — The dual engine
THE INNOVATION ENGINE

BUILD & Sizing.

Free web code calculators and advanced BIM plugins built to speed up real-world construction. Grouped by design workflow — from site analysis to structural checks and MEP sizing.

THE EDUCATION ENGINE

TEACH & Legacy.

Independent scaled curriculum, educational archives, and vocational workshops. We show our math and document the legacy of Black builders.

Explore Learning Suite →
§01

Zoning & Site

6 tools
Live

FAR / Lot Coverage

Floor area ratio and lot coverage. Dynamic floor list with exclude toggle for cellar, mechanical, parking. Pass/fail against zoning limits.

NJMLUL · Local Zoning
→ Live

Parking Calculator

Off-street parking, loading, EVSE, micromobility, auto-share credit, and shared parking per Newark Ord. §41:7. All Table 7-1 through 7-5 uses.

Newark §41:7 · 7-1–7-5 · NJ EVSE
→ Live

Average Grade

Grade points with garage door tags. Derives lowest/highest adj. grade, first floor minimum, basement sill/floor elevations, and garage slab with slope.

Site grading
→ Live

Stormwater Calculator

NJAC 7:8 (Jan 2026) compliance + Newark §41:17 product sizing. Major and minor development, NOAA PFDS site-specific rainfall, water quality, BMP selection, volumetric reduction, elevation auto-adjust.

NJAC 7:8 · NRCS TR-55 · NEH 630 · NOAA Atlas 14
→ Beta

Stormwater Calculator v3

The new stormwater tool. Runs all six current and projected design storms with NRCS hydrograph routing, sizes storage tanks, pipe rows, chambers or seepage pits and their outlet openings, and matches an engineer’s HydroCAD model within a few percent.

NJAC 7:8 (Jan 2026) · Newark §41:17 · NEH 630 · NOAA Atlas 14
→ Reference

Stormwater Methodology

How the stormwater calculator works — rational method, NRCS runoff, water quality, BMP sizing, groundwater recharge methodology explained.

NJAC 7:8 · TR-55 · NEH 630 · GSR-32
→ Reference

Stormwater Glossary

Quick-reference definitions for 33 stormwater terms and abbreviations. Alphabetical, with links to the full methodology.

CN · Tc · HSG · TSS · BMP · WQDS
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§02

Code analysis

6 tools
Live

Construction Type

Select materials and assembly ratings. Determines qualifying IBC construction types including Type IV mass timber subtypes.

IBC Table 601 · §705.5 · §602
→ Live

Height / Area / Stories

Allowable height, stories, and area with frontage increase. Non-separated vs separated mixed occupancy side by side. Fire separations per Table 508.4.

IBC 504.3 · 504.4 · 506.2 · 508.4
→ Live

Fire Separation / Exterior Wall

Exterior wall fire-resistance rating, allowable opening area, opening protection, and projection limits by FSD, construction type, occupancy, and sprinkler status. Bearing wall cross-check with Table 602.

IBC 602 · 705.2 · 705.5 · 705.8
→ Live

Egress Width

Multi-floor egress widths with automatic stair accumulation, exit count warnings, and stair discharge onto exit discharge level with 50% rule check.

IBC §1005.1 · 1006.3.3 · §1028.1
→ Live

Occupant Load

Occupant load by floor and space per IBC Table 1004.5. All 40 functions of space with gross/net designation, fixed seating by count, and building total with Revit text output.

IBC 2021 Table 1004.5 · §1004
→ Live

Rehab Subcode Navigator

Scope-of-work classification for existing buildings. Repair, Renovation, Alteration, Reconstruction, Change of Use, Addition — with compliance triggers, Basic & Supplemental Requirements, hazard table.

NJAC 5:23-6 · §6.4–6.32 · IECC
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§03

Structural

3 tools
Live

Footing Calculator

Rectangular pad footing design. 10 ACI checks with pass/fail. Eccentricity, multi-layer rebar, auto-sizing with constraints. Presumptive or geotechnical bearing.

ACI 318-14 · ASCE 7-16 · IBC 1806.2
→ Live

Floor Joist Selector

Dimensional lumber and engineered I-joist floor spans. Size by span across IRC tables and 6 manufacturers, or find equivalent substitutions between TJI, LP, BCI, Nordic, GP, and APA PRI.

IRC R502.3.1 · TJ-4000 · APA PRI-400
→ Live

Dead Load Calculator

Build up assembly dead loads layer by layer. Preset materials for common roof, floor, wall, and ceiling assemblies with custom entry.

ASCE 7-16 Tables C3-1 · C3-2
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§04

MEP

5 tools
Live

Plumbing Fixtures

Minimum fixture counts for mixed occupancies with 2/3 occupant load reduction and urinal substitution.

NSPC 7.21.1 · 7.21.2 · 7.21.10
→ Live

Water Service Pipe

Size service line, cold/hot mains by NSPC Appendix B simplified method. Copper K/L/M, CPVC SDR11, PEX SDR9. Pressure budget, booster/PRV triggers, fixture supply branch table, residential water softener, SVG/PNG/DXF riser diagram export.

NSPC §B.7.3 · §10.14 · §10.19 · IRC-NJ §P2904
→ Live

Drainage Pipe Sizing

Sanitary drainage by floor — DFU counts, horizontal branches, stacks, building drain/sewer, vent stacks, branch vents, trap arms. Floor model with BWV flagging and WC restriction checks.

NSPC 2021 · 5.2 · 11.4.1 · 12.8.1
→ Live

Electrical Service

Dwelling unit and multifamily service sizing per NEC 220.82, 220.83, and 220.84. Appliance loads, HVAC, EV charging, demand factors, and Revit-ready text output.

NEC 220.82 · 220.83 · 220.84
→ Live

Gas Pipe Sizing

Natural gas / Schedule 40 black iron / low pressure. Predesign quick lookup or full appliance list with per-segment sizing, SVG piping schematic, and Revit text output.

IFGC 2021 · 402.4(2) · NJ UCC
→
§05

Checklists

2 tools
Live

Plan Review Checklist

Drawing set completeness checklist for NJ UCC plan review. 135 items across 13 sections with Yes/No/N/A tracking. Scope-aware — sprinkler and elevator items toggle automatically.

NJAC 5:23-2.15(f) · 5:23-3.4
→ Live

Project Checklist

Full project lifecycle checklist — Pre-Design through Post-Construction. 8 phases, 167 items with Done / In Progress / Not Started / N/A tracking. Optional NJ items toggle.

Inspired by AIA D200 · B101 · A201
→
§06

Selection & Spec

1 tool
Live

Window Selector

2,387 windows across 9 series. Filter by brand, series, type, egress, fall protection, size. Reorderable schedule with Revit output.

IRC R310.2 · Pella · Andersen · JELD-WEN
→
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§04 — Reference

We show our math.

Every calculator has a methodology page explaining the equations, coefficients, and code assumptions. No black boxes. If you want to check our work, you can.

NJAC 7:8 IBC 2021 ACI 318-14 ASCE 7-16 NEC 2020 Read methodology →
§05 — Put them to work

TAKE them, they’re YOURS.

Browse the toolkit ↑

22 calculators · free forever

Code-cited · methodology-open

Got a calc you wish existed? Tell us in the intake form — info@greenstoriesllc.com.