Pre-Harvest Interval (PHI) Calculator
Find the earliest safe harvest date after spraying from the product's pre-harvest interval (PHI), keeping residues within MRLs.
The pre-harvest interval (PHI) is the minimum days between the last spray and harvest, set on each product's label so residues fall within the Maximum Residue Limit (MRL). Harvesting early risks illegal residues, rejected produce and health hazards. Find the exact PHI on your product label and enter it here.
Always follow the product label — the label is the law. Verify doses, PHI and compatibility with the manufacturer and local regulations before spraying.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Farmers and exporters use the free Pre-Harvest Interval Calculator to find the earliest date they can safely harvest after spraying — protecting consumers, passing residue tests and avoiding rejected consignments.
About Pre-Harvest Interval (PHI) Calculator
The pre-harvest interval (PHI), or waiting period, is the minimum number of days that must pass between the last pesticide spray and harvest, so that chemical residues break down below the legal Maximum Residue Limit (MRL). Harvesting before the PHI is up risks illegal residues, rejected or destroyed produce, export bans and real health hazards. This tool takes your last spray date and the product's PHI (from its label) and gives the earliest safe harvest date, plus the worker re-entry interval.
How to use Pre-Harvest Interval (PHI) Calculator
- 1Enter the date of your last spray.
- 2Enter the PHI (waiting period) printed on the product label.
- 3Do not harvest before the safe date shown; keep workers out until the re-entry date.
Why use Pre-Harvest Interval (PHI) Calculator?
- ✓Gives the earliest safe harvest date instantly
- ✓Also shows the worker re-entry interval (REI)
- ✓Protects you from MRL breaches and rejected produce
- ✓Free, instant and fully in-browser
Frequently asked questions
What is the pre-harvest interval (PHI)?+
It's the minimum number of days between the last pesticide application and harvest, set on the product label, allowing residues to degrade below the legal Maximum Residue Limit (MRL). It protects consumers and keeps your produce legal to sell.
What happens if I harvest before the PHI?+
Residues may exceed the MRL, making the produce illegal to sell — it can be rejected, destroyed or banned from export, and poses a genuine health risk to consumers. Always wait out the full PHI.
Where do I find a product's PHI?+
On the pesticide label (sometimes called the 'waiting period' or 'days to harvest'), set by CIBRC in India (or the EPA/local authority elsewhere). It differs by product and crop, so check each label and enter that number here.
Is this tool free and private?+
Yes — free, no sign-up, and all calculation runs in your browser, so it works offline in the field and your data never leaves the device.
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