Environment cluster
Water, Garden & Soil Calculators
Plan rainwater harvesting, irrigation, and greywater reuse, and get growing right with soil, compost, seed, and planting calculators for gardens and small farms.
Top calculators
A short starting set for the most common water, garden & soil calculators workflows.
Rain Garden Sizing Calculator: Area, Volume and Drawdown
Size a rain garden from drainage area, design storm and storage depth. Counts soil-media void storage, checks drawdown time, and cross-checks UW-Extension size factors.
Grain Moisture Adjustment Calculator | Shrink and Bushels
Convert wet grain weight to any target moisture, separate water shrink from handling shrink, and price the load in bushels for corn, soybeans, wheat and canola.
Irrigation Water Requirement Calculator | Net Deficit, Gross Depth, and Volume
Estimate irrigation water need from crop ETc, effective rainfall, field area, and irrigation efficiency, with net deficit, gross depth, acre-inches, gallons, and cubic meters.
Moon-Phase Planting Planner - Schedule Crops by Lunar Cycle
Plan your garden with the moon. Enter a starting date and crop type to see the best planting dates according to the lunar cycle.
Greywater Recycling Savings Calculator: Water Reuse, Bill Savings, and Payback
Estimate annual greywater reuse, avoided water costs, maintenance-adjusted net savings, payback period, and lifetime return for a residential greywater system.
Soil pH Adjustment Calculator | Estimate Garden Lime or Sulfur
Estimate how much lime or sulfur your soil needs to move from a current pH to a target pH, based on garden area in square feet and soil texture.
Soil Infiltration Rate Calculator | Convert Field Test Depth and Time
Calculate a soil infiltration rate from the water depth absorbed and elapsed test time. Get results in centimeters and millimeters per hour for field-test comparison.
Livestock Water Requirement Calculator | Gallons Per Head
Estimate daily drinking water for cattle, horses, sheep, goats, swine and poultry from body weight, headcount, production stage and NRC temperature response.
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Aquaponics Tank, Bed, and Pump Sizing Calculator
Plan an aquaponics system by matching fish tank volume, grow bed capacity, fish stocking density, and pump flow in one simple calculator.
Aquarium Salinity Adjustment Calculator | Marine Tank Water Swap Planner
Plan aquarium salinity corrections by calculating the water swap needed to raise or lower a marine tank with freshwater or concentrated saltwater.
Aquifer Depletion Timeline Calculator | Estimate Groundwater Runout
Estimate when a groundwater aquifer reaches depletion by combining stored volume, annual recharge, pumping demand, population growth, and climate-driven recharge decline.
Beekeeping Hive Population Calculator | Estimate Colony Size from Frame Coverage
Estimate hive population from the frames covered with bees and your bees-per-frame setting. Use this beekeeping hive population calculator to compare colonies, track buildup, and plan seasonal hive management.
Chlorine CT Calculator for Residual and Effective Contact Time
Calculate achieved chlorine CT from residual chlorine and effective contact time, check it against a required CT, and estimate the added time needed to meet the target.
Compost Hot Tub Heating Time Calculator | Microbial Heat Estimate
Estimate compost-pile heat output, hot-tub water heating time, and daily thermal energy from a compost-powered bath system.
Compost ROI Calculator - Estimate Compost Bin Payback
Estimate how quickly a compost bin, tumbler, or worm system pays for itself by comparing trash savings and the value of finished compost.
Crop Yield Forecast Calculator | Net Harvest Estimate by Acre
Forecast net crop harvest from field acreage, expected yield per acre, and anticipated losses for storage, marketing, and farm planning.
Fertilizer Application Calculator - Pounds of Product Needed
Estimate how much fertilizer product to apply from your area, target nitrogen rate, and fertilizer grade. Works for lawns, gardens, and fields in acres or square feet.
Fog Harp Water Yield Calculator | Estimate Collector Output
Calculate hourly and daily fog-harp water yield from liquid water content, wind speed, collector dimensions, and capture efficiency.
Grain Moisture Adjustment Calculator | Shrink and Bushels
Convert wet grain weight to any target moisture, separate water shrink from handling shrink, and price the load in bushels for corn, soybeans, wheat and canola.
Greywater Recycling Savings Calculator: Water Reuse, Bill Savings, and Payback
Estimate annual greywater reuse, avoided water costs, maintenance-adjusted net savings, payback period, and lifetime return for a residential greywater system.
Household Emergency Water Storage & Rotation Planner
Calculate household emergency-water coverage, compare it with storage and outage targets, and schedule container rotation dates from fill dates and intervals.
Irrigation Water Requirement Calculator | Net Deficit, Gross Depth, and Volume
Estimate irrigation water need from crop ETc, effective rainfall, field area, and irrigation efficiency, with net deficit, gross depth, acre-inches, gallons, and cubic meters.
Kirpich Time of Concentration Calculator for Watersheds
Estimate watershed time of concentration with the metric Kirpich equation using flow path length and average slope; view Tc in minutes and hours.
Livestock Feed Ration Calculator - Pearson Square Blend
Balance a two-feed livestock ration with the Pearson square: dry matter intake, blended crude protein, as-fed weights, and feed cost per head per day.
Livestock Water Requirement Calculator | Gallons Per Head
Estimate daily drinking water for cattle, horses, sheep, goats, swine and poultry from body weight, headcount, production stage and NRC temperature response.
Moon-Phase Planting Planner - Schedule Crops by Lunar Cycle
Plan your garden with the moon. Enter a starting date and crop type to see the best planting dates according to the lunar cycle.
Pile Bearing Capacity Calculator | Single Pile Capacity in Cohesive Clay
Estimate ultimate and allowable load for a single vertical pile in cohesive clay from end bearing and shaft adhesion.
Rain Garden Sizing Calculator: Area, Volume and Drawdown
Size a rain garden from drainage area, design storm and storage depth. Counts soil-media void storage, checks drawdown time, and cross-checks UW-Extension size factors.
Rainwater Harvesting Yield Calculator | Plan Roof Capture, Tank Turnover, and Supply Days
Estimate how much usable rainwater a roof can collect each year, compare that yield with tank storage and daily demand, and see which part of a rainwater system is most likely to limit performance.
Secchi Disk Clarity Converter for Turbidity, Euphotic Depth & Chlorophyll-a
Translate a Secchi disk disappearance depth into screening estimates of turbidity, euphotic-zone depth, and chlorophyll-a.
Soil Infiltration Rate Calculator | Convert Field Test Depth and Time
Calculate a soil infiltration rate from the water depth absorbed and elapsed test time. Get results in centimeters and millimeters per hour for field-test comparison.
Soil pH Adjustment Calculator | Estimate Garden Lime or Sulfur
Estimate how much lime or sulfur your soil needs to move from a current pH to a target pH, based on garden area in square feet and soil texture.
USDA Soil Texture Classification Calculator (Sand, Silt, Clay)
Classify a soil sample into its USDA texture class from sand, silt, and clay percentages, and see where the sample lands plotted on the USDA texture triangle.
Water Hardness from Calcium and Magnesium Calculator
Calculate total water hardness as CaCO₃ from calcium and magnesium in mg/L, mmol/L, or meq/L, with hardness categories and unit conversions.