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Liczbnik

Garden Calculators

Plan your garden with precision: fertilising, watering, plant density and bed area calculators.

Reviewed byRedakcja Liczbnik

All calculators

  • Lawn seed and turf calculator

    Calculate how much grass seed (kg) or turf rolls (m²) you need for your lawn. Enter the area and seeding rate — result with a 5% reserve included.

    Garden

  • Fertilizer Calculator

    Calculate the exact amount of fertilizer for your garden or lawn. Enter the area and application rate — get kilograms with a safety buffer. Free, no signup.

    Garden

  • Paving Calculator

    Calculate how many square metres of paving you need, including a cutting allowance and the volume and weight of the cement-sand bedding layer. Free, no signup.

    Garden

  • Garden soil calculator

    Calculate how much garden soil you need. Enter the area and layer depth – the calculator returns m³, litres, number of 50-litre bags and weight in tonnes.

    Garden

  • Plot area calculator

    Calculate plot area in square metres, ares and hectares. Supports rectangle, triangle and circle shapes. Free online calculator, no sign-up.

    Garden

  • Crop yield per hectare calculator

    Calculate total crop yield in tonnes and kg, convert t/ha to kg/ar, and estimate gross harvest revenue. Free crop yield calculator for farmers and gardeners.

    Garden

  • Compost Bin Calculator

    Calculate the optimal compost bin capacity for your household and garden. Takes into account number of people and garden size to give you the right bin volume.

    Garden

  • Seeding Rate Calculator (seeds per m²)

    Calculate how many seeds you need to sow a given area. Enter the surface area and seeding rate in g/m² to get the seed quantity in grams, kilograms and estimated plant count.

    Garden

  • Vegetable Yield Calculator

    Estimate the vegetable yield from your allotment or garden. Enter the growing area, base yield per m² and care level — the calculator returns expected harvest in kilograms.

    Garden

  • Plant Watering Calculator

    Estimate how much water your lawn, vegetables, flowers and shrubs need per week and per day. Free watering calculator accounting for area and season.

    Garden

Gardening — calculators and converters

A well-planned garden rewards precision as much as patience. Garden calculators on Liczbnik.pl help you work out planting density, fertiliser doses, watering schedules and the volume of soil needed for raised beds — all accurately and instantly.

The garden area and bed calculator lets you measure your plot, compute the area of each zone and determine how many plants will fit. Planting density depends on the species — tomatoes every 50–60 cm (3–4 plants/m²), lettuce every 25 cm (9–16 plants/m²), carrots every 5 cm in the row (over 80 plants/m²). Knowing your available space, the calculator instantly tells you how many seedlings or seed packets to buy.

Fertilising is the key to a healthy harvest, but excess nitrogen harms plants and the environment. The fertiliser calculator works out the dose based on soil type, pH, crop species and desired yield. A lawn needs 2–4 g of pure nitrogen per m² per month during the growing season — about 20–40 g of a 10% N compound fertiliser. For 100 m² of lawn that is 2–4 kg of product per month.

Watering is the largest ongoing use of garden water, especially in summer. The watering calculator estimates daily water requirements by plant species, air temperature and soil type. Sandy soil needs watering more frequently than clay. Leafy vegetables (lettuce, spinach) need 2–3 l/m²/day at 25°C, while fruit trees require 20–60 litres per week.

Soil for raised beds and planters must be calculated precisely. The soil volume calculator converts bed dimensions (length × width × depth) into litres or cubic metres, making it easy to buy the right amount of compost or peat. A 2 × 1 × 0.3 m box needs 0.6 m³, or about 600 litres of growing medium. All garden calculators are free and work on any device.

Frequently asked questions about gardening

How to calculate garden area?

Rectangle area = length × width. For irregular shapes, divide into rectangles or triangles.

How much fertiliser per m² of lawn?

A lawn needs about 2–4 g nitrogen/m²/month during the growing season (April–September).

How many plants per m²?

Planting density depends on species: tomatoes 3–4/m², lettuce 9–16/m², carrots 80–100/m².

How much water does a garden need in summer?

On hot days, a garden needs about 10–20 l/m²/week. Vegetables need 2–3× more than a lawn.

How to check soil pH?

Test soil pH with a pharmacy test kit or electric meter. Optimal pH for most plants: 6–7.

When to sow seeds?

Sowing time depends on the plant and climate. Tomatoes: March under cover; carrots: April outdoors.

What is soil pH and how to correct it?

Acidic soil (pH < 6) is corrected with liming; alkaline soil (pH > 7) with peat or iron sulphate.

How much soil to fill a raised bed?

Volume = length × width × height (metres). E.g. 2 m × 1 m × 0.3 m = 0.6 m³ of soil.

How to calculate pesticide usage?

Usage = concentration [ml/l] × water volume [l]. E.g. 5 ml/l × 10 l = 50 ml of product.

When to fertilise the garden?

Spring (March–April) — nitrogen and phosphorus; summer (June) — nitrogen; autumn (October) — potassium and phosphorus.

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