All Free Gardening Calculators
Browse all 119 free calculators across 15 categories. Every tool is free, works on any device, and requires no signup.
Calculate soil volumes, compost quantities, mulch coverage, and amendment ratios for beds, borders, and containers.
Raised Bed Soil Calculator
Calculate how much soil you need to fill a raised bed of any size.
Compost Bin Size Calculator
Work out the ideal compost bin size for your garden waste output.
Topsoil Calculator
Calculate topsoil volume needed in cubic metres, bulk bags, or tonnes.
Mulch Calculator
Work out how much mulch you need for beds, borders, and paths.
Soil Amendment Calculator
Calculate quantities of grit, sand, or organic matter to improve soil.
Potting Mix Calculator
Work out the right ratios of compost, perlite, and vermiculite for potting mix.
Worm Composting Calculator
Calculate wormery size and worm quantities for your food waste.
Leaf Mould Calculator
Estimate leaf mould yield from collected autumn leaves.
Soil pH Adjustment Calculator
Calculate how much lime or sulphur to add to reach your target soil pH.
Green to Brown Ratio Calculator
Balance green and brown materials for optimal composting.
Compost Ratio Calculator
Calculate compost C:N ratios and get mix recommendations for faster composting.
pH Amendment Calculator
Calculate lime or sulphur needed to adjust soil pH with application rates, timing, and retest schedules.
Composting Time Calculator
Estimate how long your compost pile will take based on materials, volume, turning frequency, and temperature.
Soil Volume Calculator
Calculate soil needed for raised beds, planters, and containers of various shapes.
Calculate grass seed rates, turf rolls, lawn feed quantities, and maintenance schedules for healthy lawns.
Lawn Seed Calculator
Calculate how much grass seed you need for a new lawn or overseeding.
Turf Roll Calculator
Work out how many turf rolls you need to lay a new lawn.
Lawn Feed Calculator
Calculate the right amount of lawn fertiliser for your grass area.
Lawn Area Calculator
Measure your lawn area including irregular shapes and obstacles.
Overseeding Calculator
Calculate seed rates for patching and thickening existing lawns.
Lawn Overseeding Calculator
Calculate seed quantity, preparation steps, and timing for lawn overseeding.
Top Dressing Calculator
Work out how much top dressing mix to level and improve your lawn.
Lawn Sand Calculator
Calculate lawn sand quantities for moss control and greening.
Grass Seed Germination Calculator
Estimate germination time based on soil temperature and seed type.
Lawn Mowing Height Calculator
Find the ideal mowing height for your grass type and season.
Scarification Calculator
Plan your lawn scarification schedule and calculate waste volume.
Lawn Mowing Time Calculator
Estimate how long it takes to mow your lawn based on area, shape, method, and obstacles.
Artificial Grass Calculator
Calculate how much artificial grass, sub-base, weed membrane, and infill sand you need for your garden.
Calculate plant spacing, bulb quantities, hedge distances, and planting layouts for beds and borders.
Plant Spacing Calculator
Calculate how many plants you need for a given area and spacing.
Bulb Planting Calculator
Work out bulb quantities, planting depths, and spacing for displays.
Hedge Spacing Calculator
Calculate how many hedge plants you need for a given length.
Tree Spacing Calculator
Work out proper tree spacing for orchards, avenues, and gardens.
Row Planting Calculator
Calculate plant quantities for straight rows in beds and allotments.
Square Foot Gardening Calculator
Plan a square foot garden with correct plant counts per square.
Companion Planting Calculator
Find companion planting combinations and spacing for common vegetables.
Seed Tray Calculator
Calculate how many seed trays and cells you need for your seedlings.
Succession Planting Calculator
Plan sowing intervals for a continuous harvest throughout the season.
Intercropping Calculator
Calculate spacing and timing for growing two crops in the same area.
Calculate pot volumes, compost quantities, drainage layers, and container sizes for container gardening.
Pot Volume Calculator
Calculate the volume of round, square, or tapered plant pots.
Container Compost Calculator
Work out how much compost you need to fill your containers.
Window Box Calculator
Calculate compost volume and plant quantities for window boxes.
Hanging Basket Calculator
Work out compost, liner, and plant quantities for hanging baskets.
Grow Bag Calculator
Calculate how many grow bags you need and plants per bag.
Drainage Layer Calculator
Work out crocks or gravel needed for container drainage layers.
Repotting Size Calculator
Find the right next pot size when repotting plants.
Self-Watering Pot Calculator
Calculate reservoir size and watering frequency for self-watering pots.
Calculate water butt sizes, irrigation layouts, sprinkler coverage, and watering schedules.
Water Butt Size Calculator
Calculate the ideal water butt size based on your roof area and rainfall.
Irrigation Timer Calculator
Work out watering duration and frequency for your irrigation system.
Drip Irrigation Calculator
Calculate dripper spacing, flow rates, and pipe lengths for drip systems.
Sprinkler Coverage Calculator
Work out sprinkler placement and overlap for even lawn coverage.
Watering Can Calculator
Calculate how many watering cans you need for your garden beds.
Hose Flow Rate Calculator
Estimate water flow rate based on hose diameter and pressure.
Rainwater Harvesting Calculator
Calculate annual rainwater collection potential from your roof.
Evapotranspiration Calculator
Estimate daily water loss from your garden based on weather conditions.
Water Pressure Calculator
Calculate water pressure and flow rate for garden irrigation systems.
Calculate fence panels, posts, concrete, trellis, edging, and garden border materials.
Fence Panel Calculator
Calculate how many fence panels you need for your boundary.
Fence Post Calculator
Work out the number of fence posts and spacing for your fence run.
Gravel Board Calculator
Calculate gravel boards needed to protect fence panels from rot.
Trellis Calculator
Work out trellis panel quantities and fixing requirements.
Edging Calculator
Calculate lawn or border edging quantities for straight and curved runs.
Sleeper Calculator
Work out how many railway sleepers you need for raised beds or retaining walls.
Border Edging Calculator
Calculate decorative border edging for flower beds and paths.
Post Concrete Calculator
Work out how much postcrete or concrete you need for fence posts.
Fence Paint Calculator
Calculate fence paint or stain needed for panels and posts.
Gate Width Calculator
Find the ideal gate width and calculate hardware requirements.
Raised Bed Material Calculator
Calculate materials for building raised beds including boards, fixings, fabric, and soil volume.
Calculate paving slabs, gravel, sand, block paving, and path materials for patios and garden paths.
Paving Slab Calculator
Calculate how many paving slabs you need for a patio or path.
Gravel Calculator
Work out gravel quantities in tonnes or bulk bags for drives and paths.
Patio Area Calculator
Calculate patio area and materials for rectangular or L-shaped patios.
Stepping Stone Calculator
Work out stepping stone quantities and spacing for garden paths.
Block Paving Calculator
Calculate block paving quantities with wastage allowance.
Sand Sub-Base Calculator
Work out sharp sand and sub-base aggregate for paving foundations.
Jointing Sand Calculator
Calculate kiln-dried or polymeric jointing sand for paving joints.
Path Edging Calculator
Work out edging kerbs or restraints needed for paths and drives.
Crazy Paving Calculator
Estimate crazy paving quantities and mortar for irregular layouts.
Resin Bound Gravel Calculator
Calculate resin and aggregate quantities for resin-bound surfaces.
Calculate greenhouse sizes, heating requirements, grow light coverage, and propagation needs.
Greenhouse Size Calculator
Work out the ideal greenhouse size for your growing plans.
Cold Frame Calculator
Calculate cold frame size and capacity for hardening off plants.
Grow Light Calculator
Work out grow light wattage and coverage for indoor growing.
Seed Starting Calculator
Calculate seed quantities with germination rates and succession sowing.
Propagation Calculator
Work out propagator capacity and timing for cuttings and seeds.
Greenhouse Heating Calculator
Calculate heater wattage needed to maintain greenhouse temperature.
Ventilation Calculator
Work out ventilation requirements for greenhouses and polytunnels.
Polytunnel Calculator
Calculate polytunnel cover area and growing space.
Cloche Calculator
Work out cloche quantities and sizes to protect crops.
Fleece Coverage Calculator
Calculate horticultural fleece needed to protect plants from frost.
Shade Coverage Calculator
Calculate shade structure sizing for pergolas, sails, and umbrellas.
Calculate vegetable plot sizes, crop yields, seed quantities, and growing requirements for common vegetables.
Vegetable Plot Size Calculator
Work out how big a veg plot you need to feed your family.
Crop Yield Calculator
Estimate harvest yields for common vegetables based on growing area.
Raised Bed Vegetable Calculator
Plan what to grow in a raised bed with spacing and yield estimates.
Allotment Planner Calculator
Plan crop rotations and plot layouts for allotment gardening.
Potato Chitting Calculator
Calculate seed potato quantities, spacing, and chitting times.
Runner Bean Calculator
Work out cane quantities, spacing, and expected yields for runner beans.
Tomato Feed Calculator
Calculate tomato feed dilution rates and feeding schedules.
Sweetcorn Block Calculator
Plan sweetcorn block planting for proper wind pollination.
Courgette Spacing Calculator
Calculate courgette plant spacing and expected yields.
Pea and Bean Support Calculator
Work out support structures and netting for climbing peas and beans.
Garlic Planting Calculator
Calculate garlic clove quantities, spacing, and planting depth.
Rhubarb Crown Calculator
Work out spacing and yields for rhubarb crown planting.
Garden Bed Rotation Planner
Plan crop rotation across garden beds to maintain soil health and reduce disease.
Frost Date Planner
Plan your planting calendar based on last and first frost dates for common vegetable crops.
General purpose area, volume, slope, and cost calculators for garden planning and material estimation.
Area Calculator
Calculate the area of rectangular, circular, and triangular garden spaces.
Volume Calculator
Work out volumes for any garden project in cubic metres or litres.
Slope Calculator
Calculate garden slope gradient, angle, and drainage requirements.
Border Area Calculator
Work out the area of curved or irregular garden borders.
Circular Bed Calculator
Calculate area and edging for circular or semi-circular flower beds.
Odd Shape Area Calculator
Estimate the area of irregularly shaped garden spaces.
Material Weight Calculator
Convert between volume and weight for common garden materials.
Coverage Rate Calculator
Calculate how much material you need based on coverage rates.
Cost Per Square Metre Calculator
Work out cost per square metre for comparing garden materials.
Garden Scale Drawing Calculator
Convert real garden measurements to scale drawing dimensions.
Calculate pond volumes, liner sizes, pump requirements, and fountain specifications for garden water features.
Calculators for garden structures including lighting, pergolas, decking, and sheds.
Companion planting layouts, spacing guides and planting combinations for vegetable gardens.
Retaining walls, boundary structures and garden boundaries.
Useful gardening reference guides, planting charts and growing data.
Lawn Seed & Feed Rates
Lawn seed rates per square metre for new lawns and overseeding, fertiliser application rates and UK seasonal timing.
Planting Distances Guide
Spacing distances, planting depths and best UK planting months for common vegetables, herbs and flowers.
Soil & Compost Volumes
Raised bed soil volumes by size, UK compost bag sizes and conversions between litres and cubic metres.
UK Plant Hardiness Zones
RHS plant hardiness ratings H1 to H7 with minimum temperatures, example plants and UK regional guidance.
Why Use GardenCalcs?
Every calculator on this page is completely free, requires no signup, and works on any device. Get accurate results instantly with clear breakdowns you can trust.
GardenCalcs gives you 119+ specialist calculators across 15 categories. Results include detailed breakdowns and let you input your own prices for cost estimates tailored to your needs.