Germination Rate Calculator

Track sprouts, failures, and time to emergence today. Plan transplants using targets and expected rates. Download summaries, compare lots, and refine watering habits easily.

Download options

Run a calculation to enable exports.

Calculator

Crop (optional)

Lot / Batch (optional)

Sow date (optional)

Seeds sown *

Total seeds planted in the test/tray.

Seeds germinated *

Count emerged seedlings by your cutoff day.

Days observed (optional)

Target plants (optional)

Expected rate % (optional)

If empty, observed rate is used.

Tray cells (optional)

Seed cost per seed (optional)

Temperature (°C, optional)

Moisture level (optional)

Daily germination counts (optional)

Comma-separated counts per day to compute MGT and index.

Example data table

Crop	Seeds sown	Seeds germinated	Expected rate	Target plants	Daily counts	Notes
Tomato	120	96	85%	80	6, 18, 30, 24, 12, 6	Warm mat, moderate moisture
Basil	80	68	90%	60	10, 22, 18, 12, 6	Covered tray for 48 hours
Marigold	72	54	75%	50	4, 16, 18, 10, 6	Cool nights slowed early emergence

These values are illustrative. Your conditions will change results.

Formula used

Germination rate (%) = (Seeds germinated ÷ Seeds sown) × 100
Failure rate (%) = 100 − Germination rate
Seeds needed = ceil(Target plants ÷ Planning rate)
Planning rate = Expected rate (if provided) or observed rate
95% interval uses the Wilson method for binomial data
MGT = Σ(t × n_t) ÷ Σ(n_t)
Germination index = Σ(n_t ÷ t)

Here, t is the day number and n_t is germinated seeds on day t.

How to use this calculator

Count how many seeds you sowed in the tray.
On your cutoff day, count emerged seedlings.
Enter the two numbers and press Calculate.
Add expected rate to plan future sowings.
Enter target plants to estimate seeds needed.
Optionally add daily counts for speed metrics.
Download CSV or PDF to store the record.

Tip: Use the same observation window for fair comparisons.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.