Work it out.
Calculators for the landscape gardening trade: measure up the area, find the number of plants, work out topsoil and gravel volume, count paving stones, calculate falls and dose seed and fertiliser. Enter your own measurements — the result updates live.
What do you want to find out?
Directory
Choose the question that resembles yours — then we open the right calculator.
- § 01How many m² is the bed, patio or lawn — even when it is made up of several shapes?Measurement — area →
- § 02How many ground-cover plants, perennials or small plants fit the bed at my planting spacing?Number of plants per area →
- § 03How many hedge plants should I order for a hedge of a given length and planting spacing?Hedge plants per metre →
- § 04How many m³ of topsoil or growing medium are needed for a bed or lawn at a given layer thickness?Topsoil/growing-layer volume →
- § 05How many m³ and how many tonnes of base gravel should I order for a sub-base of a given thickness?Gravel / sub-base volume →
- § 06How many slabs or paving stones fit my patio — per m² and in total including waste?Paving stones / slabs →
- § 07How much fall do I have — and is it enough? How much height difference does a given fall require over a given length?Fall / slope →
- § 08How many kg of grass seed do I need to sow or overseed a lawn of a given size?Grass seed quantity →
- § 09How many kg of lawn fertiliser do I spread over the area at a given dose?Fertiliser quantity →
- § 10How thick should the total surface be, and how many m³ of stable gravel and base protection does each layer require?Paving — build-up →
- § 11How many kg or m³ of joint sand should I use to fill the joints in a laying?Jointing-sand quantity →
- § 12Which commercial size does a measured stem circumference correspond to, and what is the stem diameter?Trunk circumference — tree →
- § 13How much slope is required on a drainage pipe — and when I lay it, how much should it fall?Drain pipe fall →
- § 14How many m³ or tons of compost should I apply to a bed or grass area to improve soil structure and humus content?Compost & soil improvement — dosage →
- § 15How many litres of spray liquid does my sprayer apply per hectare, and how much product goes in the tank?Sprayer calibration →
- § 16How wide will the excavation be at the top, and what must be in place before I may dig?Before you dig →
- § VHow do I go from measurement to a finished paving with correct layer build-up, material quantities, stone count and slope — all on one page?Full guide: coating from start to finish →
- § 17How much soil must be dug out and filled in, and which level balances?Earth volume →
- § 18Does the ground fall enough away from the house so water does not run towards the plinth?Fall away from the house →
Step V — Directory
The guided workflow: answer step by step on measurement, use, stone and fall and get the complete surface spec brought together in one flow.
Step A — Measurement & planting
Measure up the area, and work out the number of plants for the bed and hedge from the plant spacing and bond.
Step B — Soil & base layer
Calculate topsoil and gravel volumes: growing layer, base course, settlement, compaction and tonnes to order — and check the rules before digging.
Topsoil/growing-layer volume
How much topsoil for the layer?
Gravel / sub-base volume
How many m³ — and tonnes — of gravel?
Compost & soil improvement — dosage
How much compost or soil supplement to the area?
Before you dig
Slope, LER dig request and soil from roads
Earth volume
Excavation, fill and the level where they balance
Fall away from the house
Does the ground fall enough away from the plinth?
Step C — Surfacing & fall
Count tiles and paving stones, and convert fall between per mille, percent and cm/m.
Step D — Grass & fertiliser
Dose grass seed and fertiliser by area — indicative doses you can adjust yourself — and calibrate the sprayer to the dose on the label.
Tools that work in all subjects
Maths and templates that work in every trade — and at school. Every tool shows the formula and the working with your own numbers.
- Pythagorasa² + b² = c²Find the missing side, set out a right angle, check whether a room is square, and find the space diagonal.
- Area and perimeterm²Rectangle, triangle, trapezium, circle and composite shapes — area and perimeter.
- Volume and surface aream³ · lBox, cylinder, cone, sphere, pyramid, prism, pipe and frustum — also in litres.
- Percent%Percentage of, how many per cent, percentage change, discount and VAT.
- Scale and ratios1 : 50From drawing to reality, area and volume to scale, the rule of three and dividing in a ratio.
- Unit convertermm ↔ mFrom mm to km, Pa to bar and kB to GB — with the unit staircase.
- Time calculations and the clockt : minTime between two clock times, add time, and 1.75 h = 1 h 45 min for the timesheet.
- Slope and fall% · ° · 1:xFall from level to level, in per cent, per mille, degrees and mm per metre — and the height difference.
- Material consumption including wastem² + %Boards, paint, battens at c/c spacing and packs — for a composite surface or a whole room, with waste.