Use real dimensions when possible
Measure length, width, depth, diameter, roof area, or lawn area directly. Rounded guesses are fine for early planning, but small measurement errors can matter on larger projects.
Calculator hub
Garden Calculators
Find lightweight calculators for common home garden and small landscaping projects. Tools are grouped by project type so you can move from measurements to useful estimates quickly on mobile or desktop.
Soil & Raised Beds
Plan raised beds, planter boxes, and garden soil orders with practical volume estimates.
Soil & Raised Beds
土壤用量計算
Estimate soil volume for raised beds, containers, and garden beds.
soil calculator for raised beds and planters Soil & Raised Beds花槽土壤用量計算
Calculate how much soil you need for a new raised garden bed.
raised bed soil calculator by length, width, and depth Soil & Raised Beds盆栽培養土計算
Estimate potting mix for balcony planters, pots, and container gardens.
balcony planter soil calculator for apartment container gardensMulch & Landscaping
Estimate mulch and landscape material needs before buying bags or bulk delivery.
草坪養護
Plan grass seed and lawn inputs for small yards, patches, and renovation projects.
Water & Irrigation
Support rainwater harvesting, watering estimates, and drip irrigation planning.
Water & Irrigation
雨水收集計算
Estimate how much rainwater a roof can collect from rainfall.
rainwater harvesting calculator by roof area and rainfall Water & Irrigation滴灌計算
Plan basic drip irrigation flow and watering needs for garden beds.
drip irrigation flow calculator for emitters, GPH, and watering timeFertilizer & Compost
Estimate compost, fertilizer, and soil amendment needs with simpler planning math.
Fertilizer & Compost
肥料用量計算
Estimate fertilizer needs by garden area and application rate.
fertilizer NPK calculator for nitrogen, phosphorus, and potassium Fertilizer & Compost堆肥計算器
Estimate greens, browns, and blended compost carbon nitrogen balance.
compost C N ratio calculator for greens and brownsQuick chooser
Pick the right calculator for the job
Use the project goal first, then enter measurements from the actual space. Most pages include unit conversion, practical rounding, and a copyable result for shopping lists or notes.
| 用途 | Use this calculator | Best input to measure |
|---|---|---|
| Fill a garden bed, raised bed, or lawn low spot | 土壤用量計算 or 花槽土壤用量計算 | Area or bed length, width, depth, and number of beds |
| Cover beds, tree rings, paths, or borders | 覆蓋物計算 or 碎石用量計算 | Square footage and target depth in inches |
| Seed a new lawn or overseed thin grass | 草坪面積計算 and 草種用量計算 | Lawn area, seed type, seeding rate, and waste allowance |
| Plan rain barrels or garden drip irrigation | 雨水收集計算 or 滴灌計算 | Roof area and rainfall, or emitter count, flow rate, and run time |
| Apply fertilizer or balance compost materials | 肥料用量計算 or 堆肥計算器 | Area, target nutrient rate, fertilizer grade, material C:N ratio, and amounts |
Better estimates
How to get cleaner numbers
Match the result to the product
Bag sizes, seed rates, fertilizer grades, mulch volumes, and material density vary by brand. Use calculator results as the planning number, then compare against the package label.
Allow for outdoor variation
Uneven soil, settling, edges, slopes, waste, and compaction can change the final amount. Many calculators include an optional extra percentage for this reason.
FAQ
Garden calculator hub questions
Which garden calculator should I use first?
Start with the calculator that matches the material you are buying. Use soil calculators for fill volume, mulch and rock calculators for ground cover, lawn calculators for seed or area, and water calculators for rainwater or drip irrigation planning.
Are the calculator results exact?
No. The calculators provide planning estimates based on the measurements you enter. Product density, settling, uneven ground, and label directions can change the final amount.
Can I use these calculators on a phone?
Yes. The calculator pages use large labels, mobile-friendly inputs, result cards, reset buttons, and copy buttons where useful.
Should I add extra material to the estimate?
A small extra allowance is often useful for soil, mulch, rock, seed, and potting mix because outdoor projects rarely measure perfectly.
Do these tools replace product labels or professional advice?
No. Always check product labels, soil test recommendations, local rules, and professional advice when the project has safety, drainage, chemical, or structural concerns.