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Take the guesswork out of remineralizing your soil

Get OMRI organic soil amendment recommendations tailored specifically for your soil using OrganiCalc. See a sample OrganiCalc for Vegetables soil analysis report or a sample OrganiCalc Pro test report.

OrganiCalc for Vegetables

$28.50 for 1 year

  • Instant - full access to OrganiCalc
  • Accurate - no math errors
  • Organic - only OMRI amendments
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OrganiCalc Pro

$84.50 for 1 year

  • Easy - Pro access to OrganiCalc
  • Flexible - editable targets
  • Custom - editable amendments
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Included with a one year subscriptionOrganiCalc for VegetablesOrganiCalc Pro
Designed for Logan Labs std soil test reports - Std M3, AA, AA8.2, extras, BFA Ag-dyn3
Analyze as many soil test reports as you care to
Trusted algorithm for choosing amendments
Recommendations for vegetablesDefault
Recommendations for only OMRI organic amendmentsDefault
Error checks for typos
Adjusts for sample depths other than 6"
Adjusts for area to be amended
Adjusts for depth to dig in amendments
Choice of US or metric units
Choice of Nitrogen target
Choice of 2 N-P-K fertilizers with "best fit" N-P-K hint
One custom N-P-K fertilizer
Choice of cation targets for sand, clay or loamDefault
Edit Ca, Mg, K and Na % saturation targets
Enter up to 6 custom carbon-based N-P-K fertilizers
C:N ratio of amendments calculated
Choice of P, S, B, Fe, Mn, Cu and Zn targets
All mineral amendments may be customized
Form remembers last entries
Required for commercial customers
Access to Soil Analyst forum
When Not to Use OrganiCalc

Scholarships are available.  Contact us for details.

OrganiCalc recommends all OMRI organic amendments to build a balanced reserve of the following essential plant nutrients as measured by Mehlich 3 or AA 8.2 extraction

  • Cations – calcium, magnesium, potassium, sodium
  • Anions – phosphorus, sulfur
  • Micronutrients – boron, iron, manganese, copper, zinc, cobalt, molybdenum, and silicon
  • Nitrogen – supplied via carbon-based organic materials

Already have a Logan Labs test report?  See our analysis options here

The Grow Abundant OrganiCalc worksheet is both powerful and easy to use, and the results I’ve had using it on my farm have been nothing short of spectacular. Erica has opened up the world science-based remineralization to everyday gardeners and farmers, and has allowed us to take control of the health of our soils.
— Ryan Nassichuk, Quadra Island, British Columbia, Canada

If it isn’t in the soil, it won’t be in your food.