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 | Estimate Area, Runoff Volume, and Ponding Storage
Estimate rain garden area from impervious surface, rainfall depth, runoff coefficient, and ponding depth. Includes formula details, a worked example, planting guidance, and an optional runoff-routing mini-game.
Soil Infiltration Rate Calculator - Measure Water Absorption
Estimate how quickly water soaks into soil using test depth and time. Useful for irrigation planning and stormwater management.
Irrigation Water Requirement Calculator - Plan Water Use
Estimate irrigation water needs from crop evapotranspiration, rainfall, and system efficiency to schedule watering.
Grain Moisture Adjustment Calculator – Standardize Yield and Estimate Shrink
Standardize grain yields by converting wet weights to a target moisture basis and estimating shrink losses. Works for corn, soybeans, wheat, barley, canola, and other grains and oilseeds.
Time of Concentration (Kirpich) Calculator | Watershed Hydrology
Calculate watershed time of concentration (Tc) using the Kirpich equation. Enter flow path length and slope to estimate Tc in minutes and hours, with interpretation guidance, assumptions, and a worked example.
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 may need to move from a current pH to a target pH. Enter soil pH, garden area in square feet, and soil texture for a quick amendment estimate.
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Browse 26 calculators matched to this topic, or return to the Environment category.
Aquaponics System Calculator - Balance Fish and Grow Beds
Design a thriving aquaponics setup by matching fish tank volume with grow bed size and pump flow. Learn how to maintain a healthy ecosystem.
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 Contact Time Calculator for CT Compliance Checks
Estimate chlorine CT from residual concentration and effective contact time, compare it with a required CT target, and calculate how much extra time is needed when the residual remains above zero.
Compost Hot Tub Heat Calculator - Bio-thermal Bath Planner
Estimate microbial heat from compost piles and predict how long they can warm a water-filled tub.
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 - Estimate Harvest Output
Estimate total crop yield from acreage, expected yield per acre, and likely losses so you can plan harvest storage, sales, and farm budgeting with more confi...
Fertilizer Application Calculator | Estimate Product Needed from Area, N Rate, and Grade
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 Harvest Calculator - Vertical Wire Collector Yield
Estimate daily water collection from a fog harp given fog liquid water content, wind speed, collector area, and efficiency.
Grain Moisture Adjustment Calculator – Standardize Yield and Estimate Shrink
Standardize grain yields by converting wet weights to a target moisture basis and estimating shrink losses. Works for corn, soybeans, wheat, barley, canola, and other grains and oilseeds.
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 Rotation Planner
Inventory your stored water, forecast rotation dates, and test whether your emergency supply meets household demand for outages of any duration.
Irrigation Water Requirement Calculator - Plan Water Use
Estimate irrigation water needs from crop evapotranspiration, rainfall, and system efficiency to schedule watering.
Livestock Feed Ration Calculator - Balance Protein Needs
Determine daily amounts of two feeds to meet a desired crude protein level based on animal weight and intake.
Livestock Water Requirement Calculator - Plan Daily Intake
Estimate per-animal and herd daily water needs for common livestock by species, body weight, temperature, and headcount. Outputs in gallons and liters with p...
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 | Estimate Area, Runoff Volume, and Ponding Storage
Estimate rain garden area from impervious surface, rainfall depth, runoff coefficient, and ponding depth. Includes formula details, a worked example, planting guidance, and an optional runoff-routing mini-game.
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 Water Clarity Calculator | Turbidity, Euphotic Depth, and Chlorophyll
Estimate turbidity, euphotic zone depth, and chlorophyll from a Secchi disk reading. Includes preserved MathML formulas, a worked example, interpretation guidance, and an optional Secchi timing mini-game.
Soil Infiltration Rate Calculator - Measure Water Absorption
Estimate how quickly water soaks into soil using test depth and time. Useful for irrigation planning and stormwater management.
Soil pH Adjustment Calculator | Estimate Garden Lime or Sulfur
Estimate how much lime or sulfur your soil may need to move from a current pH to a target pH. Enter soil pH, garden area in square feet, and soil texture for a quick amendment estimate.
Time of Concentration (Kirpich) Calculator | Watershed Hydrology
Calculate watershed time of concentration (Tc) using the Kirpich equation. Enter flow path length and slope to estimate Tc in minutes and hours, with interpretation guidance, assumptions, and a worked example.
Total Water Hardness Calculator - From Calcium and Magnesium
Convert dissolved calcium and magnesium concentrations into total hardness as CaCO3 and interpret water softness categories.
USDA Soil Texture Classification Calculator | Sand, Silt, and Clay Classifier
Classify a soil sample with the USDA texture triangle using sand, silt, and clay percentages. Learn what the class means, how to enter values, and how the rule-based result is determined.