Statistical & Agricultural Calculator Suite

Ultra-fast, responsive research tools built for agronomists, field researchers, statisticians, and students. Powered by client-side JavaScript.

Sample Size Calculator (Surveys & Field Trials)

Calculates required sample size for research surveys and experimental trials based on Cochran's formula and finite population correction.

Confidence Level (%)

Margin of Error / Precision (e in %)

Expected Proportion (p in %)

Population Size (Leave empty for infinite/large)

Recommended Sample Size (n)

385

Standard Error

0.0255

Z-Score Applied

1.96

Formula applied: Cochran's formula n₀ = (Z² · p · q) / e² with finite population correction if N is specified.

Standard Deviation & Variance Calculator

Enter numeric observations (e.g. wheat plot yields in q/ha) separated by commas or spaces.

Observations Data:

Sample SD (s)

2.92

Population SD (σ)

2.61

Mean (x̄)

46.00

Sample Variance (s²)

8.50

Observation (x)	Mean (x̄)	Deviation (x - x̄)	Squared (x - x̄)²

All-in-One Percentage Calculator

Solve percentage increases, yield growth, and proportions instantly.

What is X% of Y?

% of

= 37.5

Percentage Change / Crop Growth

+15.00% Growth

GST Calculator (Inclusive & Exclusive)

Calculate Indian GST for agricultural equipment, inputs, seeds, and commercial goods.

Amount (₹)

GST Slab Rate (%)

GST Exclusive (Add GST to Base Amount) GST Inclusive (Reverse Calculate GST from Total)

Net Base Amount

₹10,000.00

GST Tax (CGST + SGST)

₹1,800.00

Total Payable

₹11,800.00

CGPA to Percentage Calculator

Convert 10-point GPA/CGPA scores using CBSE and Indian agricultural university formulas.

Your CGPA (out of 10.0)

Conversion Method

Equivalent Percentage

79.80%

Division / Class

First Class with Distinction