Free DIY Calculators
Instant, accurate calculators for home improvement projects. No account needed. Everything runs in your browser.
Tile Calculators
4 tools
Shower Tile Calculator
Calculate exactly how much tile you need for shower walls and floor.
Use calculator →Bathroom Wall Tile Calculator
Estimate tile needed for bathroom walls with waste factor included.
Use calculator →Grout Calculator
Find out how many bags of grout you need for any tile project.
Use calculator →Thinset Calculator
How many bags of thinset mortar you need, plus the right trowel size for your tile.
Use calculator →Flooring Calculators
6 tools
Laminate Flooring Calculator
Calculate boxes of laminate flooring needed including waste.
Use calculator →Hardwood Flooring Calculator
Estimate hardwood flooring by box coverage with waste factor.
Use calculator →Underlayment Calculator
Calculate how many rolls of underlayment your floor project needs.
Use calculator →Subfloor Calculator
How many sheets of plywood or OSB subfloor you need, with thickness and waste factor included.
Use calculator →Carpet Calculator
Estimate carpet and padding in square yards for any room.
Use calculator →Deck Boards Calculator
How many deck boards you need — straight or diagonal pattern, picture frame border included.
Use calculator →Walls Calculators
1 tools
Paint Calculators
3 tools
Paint Calculator — Room
How many gallons of paint for a room including walls, ceiling, doors and windows.
Use calculator →Paint Calculator — Textured Walls
Textured walls need 10-40% more paint than smooth. Get an accurate estimate by texture type.
Use calculator →Exterior Paint Calculator
How many gallons to paint a house exterior — body, trim, doors, shutters, and gable ends.
Use calculator →Lighting Calculators
8 tools
Recessed Lighting Calculator — Garage
How many recessed lights do you need for your garage?
Use calculator →Recessed Lighting Calculator — Bedroom
Calculate the perfect number of can lights for a bedroom.
Use calculator →Lumens Calculator
Find out how many lumens you need for any room size.
Use calculator →Recessed Lighting Calculator — Living Room
How many recessed lights for a living room — fixture count, spacing, and layout by room size.
Use calculator →Recessed Lighting Calculator — Hallway
How many lights for a hallway and exact spacing between them — positions calculated from wall to wall.
Use calculator →Recessed Lighting Calculator — Kitchen
Ambient and task lighting for a kitchen calculated separately — counters and island included.
Use calculator →Outdoor Flood Light Calculator
How many outdoor flood lights for a driveway, backyard, or security area — based on IES standards.
Use calculator →String Lights Calculator — Deck & Patio
How many strands of string lights for a deck or patio — crisscross, straight runs, or perimeter with outlet guide.
Use calculator →Garden Calculators
5 tools
Mulch Calculator
Calculate cubic yards and bags of mulch needed for garden beds by depth and area.
Use calculator →Raised Bed Soil Calculator
How much soil to fill a raised garden bed, with Mel's Mix breakdown included.
Use calculator →Topsoil Calculator
Cubic yards and bag count for lawn, yard, or garden topsoil coverage.
Use calculator →Fertilizer Calculator
How much fertilizer to apply by lawn size — works with any brand using NPK values.
Use calculator →Seed Spacing Calculator
How many plants fit in a garden bed and how many seeds to buy — select a vegetable to auto-fill spacing.
Use calculator →Concrete Calculators
4 tools
Concrete for Fence Posts Calculator
How many bags of concrete for fence posts by hole diameter, depth, and post count.
Use calculator →Concrete Slab Calculator
Cubic yards and bag count for concrete slabs — patio, driveway, shed floor, or walkway.
Use calculator →Rebar Calculator
How many rebar bars and linear feet for a concrete slab — spacing, bar size, and weight included.
Use calculator →Quikrete Bags Calculator
Exact Quikrete bag count per fence post by hole diameter and depth — 50, 60, and 80 lb bags.
Use calculator →Utilities Calculators
2 tools
About These Calculators
Every calculator on CalcForDIY runs entirely in your browser. Nothing is uploaded to a server. No account needed. Results are instant.
All formulas are sourced from industry standards — the Tile Council of North America for tile waste factors, the National Wood Flooring Association for hardwood and laminate, and manufacturer technical documentation from Mapei and LATICRETE for grout calculations.
Whether you are a first-time DIYer or a contractor running quick estimates on a job site, these tools are built to give you accurate numbers fast.