How accurate is the yield component method for rice?

The method typically estimates within 10–20% of actual combine or thresher yield when sampling is done correctly. Sample at least 5–10 hills from multiple representative areas, avoiding field edges and unusually good or poor spots. Measure after grain fill is complete (heading + 25–30 days) for the most reliable grain count and weight.

What is a typical 1000-grain weight (TGW) for rice?

Most indica varieties have a 1000-grain weight between 20 and 28 grams. Japonica (short-grain) varieties tend to be heavier at 24–30 g. Aromatic long-grain varieties (Basmati, Jasmine) range from 22 to 30 g. Weigh exactly 1,000 fully mature, air-dry grains for the most accurate result.

What is a good number of hills per hectare?

Transplanted rice is commonly planted at 20×20 cm spacing (250,000 hills/ha) to 25×25 cm (160,000 hills/ha). Direct-seeded crops are often denser but with lower tillers per plant. Modern SRI (System of Rice Intensification) uses wider spacing, around 25×25 cm, relying on more tillers per hill.

How many productive tillers per hill is normal?

Under transplanted conditions, 8–15 productive tillers per hill is typical for high-yielding varieties with adequate nutrition. SRI or optimum management can achieve 15–25 tillers per hill. Tiller count should be measured at heading after unproductive tillers have died off.

What rice variety yields the most per hectare?

High-yielding semi-dwarf varieties like IR8, IR64, IRRI-bred lines, and Chinese super-rice hybrids can yield 6–10 t/ha under irrigated, optimal conditions. Hybrid rice typically yields 8–12% more than inbred varieties. Traditional tall varieties yield 2–4 t/ha. Most smallholder farmers achieve 3–5 t/ha under typical field conditions.

What is the difference between paddy yield and milled rice yield?

Paddy (rough rice) includes the husk and is what this tool estimates. Milled rice — the white or brown rice consumed — is roughly 65–70% of the paddy weight after hulling and milling. To convert: milled rice (tonnes) ≈ paddy yield (tonnes) × 0.67.

Rice Yield Estimator

Name: Rice Yield Estimator
Availability: InStock
Author: Nham Vu

Enter your field area, planting density, and variety yield potential to estimate total rice production in kg and tonnes.

Yield Components

Rice Variety / Type

Selecting a variety pre-fills typical component values; adjust to match your field observations.

Field Area

Enter the total planted area to calculate gross field production.

Hills per Hectare

Common: 160,000–250,000 hills/ha (20×25 cm to 20×20 cm spacing).

Productive Tillers per Hill

Count bearing panicles at heading. Typical: 8–15 for HYVs; 15–25 with SRI management.

Filled Grains per Panicle

Count only filled (non-sterile) grains. Typical HYV: 80–150; aromatic: 80–120; traditional: 70–110.

1000-Grain Weight — TGW (grams)

Weigh exactly 1,000 fully mature, air-dry paddy grains. Indica: 20–28 g; japonica: 24–30 g.

Paddy Price per Tonne (optional)

$ /t

Enter to calculate estimated gross revenue per hectare and total field.

Fill in the yield components, then click Estimate Yield.

Calculated!

Summary

Enter your field area, planting density, and variety yield potential to estimate total rice production in kg and tonnes.

How it works

Select a rice variety preset or choose "Custom" to enter your own yield potential.
Enter your field area in hectares or acres.
Enter the hill spacing (row × plant) or use the preset to auto-fill planting density.
Enter the number of productive tillers per hill and grains per panicle — scout representative hills at heading stage.
Enter the 1000-grain weight in grams — weigh 1,000 air-dry seeds for best accuracy.
Optionally enter a paddy price per tonne to see estimated gross revenue.
Click Estimate Yield to see kg/ha, total tonnes, and a full calculation breakdown.

Use cases

Pre-harvest scouting to forecast paddy production for milling and storage planning.
Comparing yield potential across different rice varieties before the next season.
Estimating gross revenue by combining yield estimate with current paddy market prices.
Evaluating the impact of drought, blast, or nitrogen stress on grain count and final yield.
Teaching agronomy students and extension workers the yield component estimation method.
Documenting field-by-field yield components for farm records and crop insurance purposes.
Planning combine harvester logistics and drying/milling capacity for harvest operations.
Benchmarking actual mill-in yield against pre-harvest field estimates for future calibration.

Frequently Asked Questions

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Last updated: 2026-05-29 · Reviewed by Nham Vu