Free calculators for
home & everyday projects

Estimate batts, rolls, bags, R-value, waste, and material cost for an insulation project.

Estimate siding squares, boxes, openings, waste, accessories, and material cost.

Estimate cubic yards, tons, bags, compaction, waste, and delivered material cost.

Solve pace, time, or distance and review race predictions, training zones, and splits.

Find out how many tiles and boxes you need for a floor, wall, or backsplash — with a waste factor and total cost. Pick a common tile size or enter your own.

Add your rooms to find out how many boxes of laminate, vinyl plank, or hardwood flooring you need — with a waste factor and total cost.

Find out how many rolls of wallpaper you need for a room — accounting for pattern repeat, waste, and total cost. Works with US and Euro roll sizes.

Find your true roof area in squares, the number of shingle bundles, and material cost — with roof pitch and a waste allowance factored in.

Find out how many sheets of drywall you need — plus screws, joint compound, and tape — from your room size or total area, with waste and cost.

Find out how many deck boards and screws you need for your deck — accounting for board width, the gap between boards, waste, and total cost.

Find out how many bags, rolls, or batts of insulation you need for your attic, walls, or floors — with R-value guidance, waste, and total cost.

Add your walls to find out how many squares and boxes of siding you need — for vinyl, fiber cement, and more — with a waste factor and total cost.

Find out how many blocks and cap blocks you need for a retaining wall — plus base gravel — with a waste factor and total cost.

Enter your total rise to get the number of steps, the exact rise and run, and the stringer length — using safe, code-friendly stair proportions.

Find out how much gravel, crushed stone, sand, or topsoil you need for a driveway, path, or garden bed — in cubic yards, tons, bags, and total cost.

Find out how many pallets or rolls of sod you need for your lawn — or how much grass seed to buy. Includes cost estimate and waste buffer.

Estimate your fence installation cost by material and length — wood, vinyl, chain link, aluminum, and more. Includes posts, gates, and 2026 US labor rates.

Find out how many gallons of paint you need for any room. Accounts for walls, ceiling, trim, doors, windows, and number of coats.

Calculate how much concrete you need for slabs, footings, and columns — in cubic yards and bags (40/60/80 lb). Includes cost estimate for ready-mix.

Find out how much mulch you need for your garden beds — in cubic yards, bags, and total cost. Compare bagged vs. bulk pricing instantly.

Find out how many square yards of carpet you need for your rooms — with a waste allowance and cost estimate.

Enter your rooms to find out exactly how many small, medium, and large boxes — plus tape and packing paper — you need for your move.

Enter your window size and panel width to find out how many curtain panels you need — with fullness options and fabric yardage for sewing.

Find out how many gallons your swimming pool holds — rectangular, round, or oval. Includes chlorine shock dosage reference.

Calculate weekly water needs and sprinkler run time for lawns, gardens, shrubs, and trees — accounting for rainfall and soil type.

Scale any recipe up or down by servings. Enter your ingredients and target servings to get adjusted amounts instantly — with fraction display.

Instantly convert between cups, tablespoons, teaspoons, fluid ounces, grams, milliliters, and more. Includes temperature (°F ↔ °C).

Enter your ingredients and number of servings to find your cost per serving — plus a suggested selling price based on your target food cost percentage.

Find the right turkey size for your guest count, plus fridge defrost time and cook time — for roasted, smoked, or deep-fried birds.

Convert cups, grams, ounces, tablespoons, and teaspoons for 12 common baking ingredients — flour, sugar, butter, cocoa, and more.

Find out how much mashed potatoes, stuffing, gravy, cranberry sauce, green beans, sweet potatoes, and rolls to make — by guest count.

Calculate exactly how much meat to buy for your cookout. Enter guest count, pick your meats, get raw weight including shrinkage.

Estimate how much food to make or buy for your party — appetizers, mains, sides, and dessert — based on guest count and event type.

Find out how much beer, wine, liquor, and soft drinks to buy. Enter guests and party length for a full list — including ice and cups.

Find out how many pizzas to order for a party or group. Enter people and appetite to get pizzas, slices, and leftovers.

Plan a taco bar for any crowd. Get the meat, tortillas, beans, rice, cheese, and toppings you need by guest count.

Find out how much ground coffee and water you need — from a single cup to a big batch for a party or office.

Enter how many trick-or-treaters you expect to find out exactly how many bags of candy to buy — with a 20% buffer so you don't run out.

Calculate the tip and split the bill instantly. Works for restaurants, delivery, rideshare, and any service. Choose a preset or enter a custom percentage.

Find the best time to wake up or go to sleep based on 90-minute sleep cycles. Wake up refreshed by timing your alarm to the end of a cycle.

Enter your height and weight to calculate your Body Mass Index — with category (underweight to obese) and healthy weight range for your height.

Find your daily calorie needs using the Mifflin-St Jeor equation. Get your BMR and TDEE, plus targets for weight loss or gain.

Find out how much water you should drink each day based on your weight, activity level, and climate — in ounces, cups, and liters.

Enter any two of distance, time, or pace to solve for the third — plus projected finish times for 5K, 10K, half marathon, and full marathon.

Calculate your body fat percentage using the U.S. Navy circumference method — just a tape measure needed. Shows fat mass, lean mass, and ACE category.

Find your ideal daily protein intake based on body weight, activity level, and goal — maintain, lose fat, or build muscle. Includes per-meal breakdowns.

Enter your last period or conception date to find your estimated due date, current week, trimester, and key milestones like the anatomy scan.

Convert steps to miles, kilometers, and calories burned. Enter your step count and height for an accurate distance based on your stride length.

Enter your loan amount, interest rate, and term to find your monthly payment, total interest paid, and total cost — for auto, personal, or mortgage loans.

See how your money grows with compound interest. Add monthly contributions to model savings accounts, investments, or retirement funds over time.

Enter your savings goal and monthly contribution to find out how long it will take — and how much interest you'll earn along the way.

Compare up to 4 products by price per unit to instantly find the best deal — great for grocery shopping, bulk buying, and store-brand comparisons.

Enter income and expenses across 10 categories to see your monthly surplus or deficit — with a 50/30/20 rule breakdown for needs, wants, and savings.

See your debt-free date, total interest paid, and how much extra payments save you — for credit cards, personal loans, and any fixed-rate debt.

Find your exact age in years, months, and days — plus days lived, days until your next birthday, and a countdown to any date like Christmas or New Year's.

Four percentage tools in one: find X% of Y, find what percent X is of Y, calculate percentage change, and find the original value before a percentage.

Simplify any width:height ratio, scale a size while keeping the same ratio, or find a missing width or height. Great for video, print, and web design.

Calculate your weighted or points-based class grade from assignments, quizzes, and exams. See your letter grade, GPA, and what you need on the final.

Generate beautiful color harmonies instantly. Choose from analogous, complementary, triadic, and more. Copy hex codes with one click.