Seed Germination Rate Calculator

About Seed Germination Rate Calculator

The Seed Germination Rate Calculator turns a simple germination test into a practical seed-lot reading. Enter how many seeds were sown and how many successfully germinated to get the germination percentage, a viability grade, an approximate confidence range, and an optional sowing estimate for a target number of seedlings.

Seed Germination Rate Formula

For example, if 86 out of 100 seeds germinate, the germination rate is 86%. If 37 out of 50 seeds germinate, the rate is 74%.

How to Use the Seed Germination Rate Calculator

1. Enter seeds sown: Enter the total number of seeds placed in the germination test.
2. Enter seeds germinated: Enter the number of seeds that successfully germinated by the end of the test period.
3. Add an optional target: If you are planning a tray or field stand, enter the target number of seedlings and a safety buffer.
4. Review the result: Click Calculate to see the germination rate, viability grade, confidence range, and sowing estimate.

Germination Rate Interpretation

Seed standards vary by crop, variety, age, storage condition, and local rules. Use the bands below as a practical planning guide rather than a legal seed certification standard.

Why Sample Size Matters

FAQ

What is seed germination rate?

Seed germination rate is the percentage of tested seeds that successfully germinate. It is calculated as germinated seeds divided by seeds sown, multiplied by 100.

How many seeds should I test?

A larger sample gives a more reliable estimate. A 100-seed test is common for small lots, while professional seed testing often uses larger replicated samples.

Can germination rate be over 100%?

No. The number of germinated seeds cannot exceed the number of seeds sown in the test.

Why does the calculator show a confidence range?

The confidence range shows sampling uncertainty. A small test can produce the same percentage as a large test, but the large test gives a more dependable estimate.