The Mother of Calculators

The ultimate toolkit for Site Development and Engineering. Master your grading, drainage, accessibility, and planting calculations in one place.

Scale Converter

Convert plan dimensions to real-world units. Supports 1:50, 1:100, 1:250 & more.

Slope Grading

Calculate percentages, angles, and terrain functions (Access vs. Stabilization).

ADA Ramps

Design accessible ramps with automatic landing calculations and handrail checks.

Stair Formula

Blondel Law (2R+T) calculator for comfortable Indoor & Outdoor stairs.

Manning Flow

Hydraulic flow rate (Q) for open channels, swales, and streams.

Surface Runoff

Rational Method (Q=CIA) for stormwater drainage estimation.

Plant Density

Estimate planting quantities for Square vs. Triangular grid spacing.

Scale Ratio (1 : X)

Real World Length

Drawing / Paper Length

Architectural & Map Scale Converter

Essential for architects, engineers, and builders. Instantly convert Real-World Dimensions to Drawing Units. Supports standard scales (1:50, 1:100, 1:250, 1:500).

Length - L (m)

Height - H (m)

Slope (%)

Angle (°)

Calculation Result

Enter 2 values & Calculate

Slope Grading Calculator

Calculate slope percentage, angle, and grade. Features intelligent terrain function categorization for site planning and civil works.

Total Height (m)

Slope (%)

Landing Length (m)

Run Length:-

Landings (Every 0.75m):-

Total Length:-

Handrail:-

ADA & Accessibility Ramp Calculator

Design safe wheelchair ramps. Automatically determines total length and required intermediate landings based on height and max slope regulations.

Stair Type

Outdoor (Landscape) Indoor (Building)

Total Height (m)

Formula Target

Riser (cm)

Riser Slider

Tread (cm)

Flight Limit (Max Steps)Current Limit: 12

Steps:-

Formula Rule:-

Landings:-

Blondel Stair Calculator

Plan ergonomic stairs using 2R + T = 60-63cm. Toggle between Indoor and Outdoor standards to adjust Riser/Tread limits automatically.

Roughness (n)

Slope (%)

Bottom Width (m)

Top Width (m)

Water Depth (m)

Flow Rate (Q):-

Open Channel Flow (Manning)

Calculate flow rate (Discharge Q) in channels and swales. Essential for hydraulic analysis and flood control.

Surface Type

Rainfall Intensity (mm/hr)

Area Size

Runoff Volume (Q):-

Surface Runoff (Rational Method)

Estimate peak stormwater runoff using Q = CIA. Helps in sizing drainage systems and retention ponds.

Total Area (m²)

Distance (cm)

Pattern

Square Grid Triangular (Staggered)

Total Plants:-

Density (p/m²):-

Planting & Area Density

Calculate quantity for any grid-based placement. Compare Square vs. Triangular spacing for planting or paving.