TidyCalc: Free calculators for money, home, health & everyday life
Free, fast calculators for loans, ROI, taxes and freelance rates — plus how much concrete, gravel, mulch, soil, sand or paint to buy for any project.
94 free calculators — no sign-up, no app, works on your phone.
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Most popular
Mortgage Calculator
Full monthly payment with taxes, insurance & PMI
Loan Calculator
Monthly payment, total interest & cost of any loan
Compound Interest Calculator
How your savings grow over time
Percentage Calculator
Find a percentage of any number
BMI Calculator
Body Mass Index from your height and weight
Age Calculator
Your exact age in years, months and days
Car Loan Calculator
Monthly payment with down payment, trade-in & tax
Concrete Calculator
How many cubic yards & bags of concrete you need
Finance & Business
Loans, mortgage, ROI, retirement, taxes and savings.
Loan Calculator
Monthly payment, total interest & cost of any loan
Rental Property ROI Calculator
Cash flow, cap rate & cash-on-cash return
Profit Margin Calculator
Margin, markup & profit from cost and price
Break-Even Calculator
How many units to cover your costs
Freelance Hourly Rate Calculator
The rate you must charge to hit your income goal
Self-Employment Tax Calculator
Estimate SE tax & what to set aside each quarter
Compound Interest Calculator
How your savings grow over time
Mortgage Calculator
Full monthly payment with taxes, insurance & PMI
Debt Payoff Calculator
How long to pay off a balance — and the interest cost
Savings Goal Calculator
Monthly amount to hit a savings target
ROI Calculator
Return on investment, profit & annualized return
Salary Calculator
Convert hourly, weekly, monthly & annual pay
Home Affordability Calculator
How much house you can afford (28/36 rule)
Retirement Calculator
Project your nest egg and retirement income
Inflation Calculator
How inflation changes the value of money over time
Refinance Calculator
New payment, monthly savings & break-even point
401(k) Calculator
Project your 401(k) balance with employer match
Net Worth Calculator
Add up assets and debts to find your net worth
Take-Home Pay Calculator
Estimate your paycheck after taxes
Credit Card Payoff Calculator
Time, interest & the power of paying extra
Marketing & SaaS
ROAS, lifetime value, conversion rate and ad metrics.
ROAS Calculator
Return on ad spend, ACOS & ad profit
Customer Lifetime Value (LTV) Calculator
Lifetime value per customer and LTV:CAC ratio
Conversion Rate Calculator
Conversion rate, revenue per visitor & value per sale
CPM Calculator
Cost per 1,000 impressions for ad campaigns
CAC Calculator
Customer acquisition cost & LTV:CAC ratio
Churn Rate Calculator
Customer churn, retention & average lifetime
MRR & ARR Calculator
Monthly & annual recurring revenue
CPC Calculator
Cost per click, CTR & cost per conversion
CTR Calculator
Click-through rate & cost per click
CAC Payback Period Calculator
Months to recover customer acquisition cost
Auto & Vehicle
Car loans, affordability, fuel cost and MPG.
Health & Fitness
BMI, calories, macros, body fat and training.
BMI Calculator
Body Mass Index from your height and weight
TDEE Calculator
Daily calories you burn (and need)
Macro Calculator
Protein, carbs & fat grams from your calories
Body Fat Calculator
Estimate body fat % (U.S. Navy method)
Ideal Weight Calculator
A healthy target weight for your height
One Rep Max Calculator
Estimate your 1RM and training loads
Water Intake Calculator
How much water to drink per day
Date & Time
Age, date differences and countdowns.
Solar & Energy
Solar payback, EV charging and running costs.
Everyday Math
Percentages, tips, discounts, sales tax and area.
Concrete & Masonry
Slabs, footings, bricks, pavers and walls.
Concrete Calculator
How many cubic yards & bags of concrete you need
Concrete Slab Calculator
Concrete for patios, garage & shed floor slabs
Concrete Footing Calculator
Concrete for footings & foundation trenches
Cubic Yard Calculator
Convert any length × width × depth to cubic yards
Brick Calculator
How many bricks you need for a wall
Paver Calculator
How many pavers for a patio or walkway
Retaining Wall Block Calculator
How many blocks for a retaining wall
Landscaping & Garden
Gravel, mulch, soil, sand, sod and seed.
Gravel Calculator
Cubic yards & tons of gravel for driveways and paths
Mulch Calculator
Bags & cubic yards of mulch for your beds
Topsoil Calculator
Cubic yards & bags of topsoil for lawns and beds
Sand Calculator
Tons & cubic yards of sand for any project
Pea Gravel Calculator
Cubic yards, tons & bags of pea gravel
River Rock Calculator
Cubic yards & tons of decorative river rock
Crushed Stone Calculator
Tons & cubic yards of crushed stone
Paver Base Calculator
Gravel base & sand under your pavers
Compost Calculator
Cubic yards & bags of compost for beds and lawns
Fill Dirt Calculator
Cubic yards & tons of fill dirt
Raised Bed Soil Calculator
How much soil to fill a raised garden bed
Sod Calculator
How many rolls & pallets of sod for your lawn
Grass Seed Calculator
Pounds of grass seed for a new or overseeded lawn
Fertilizer Calculator
How many bags of fertilizer for your lawn
Flooring & Tile
Tile, laminate, hardwood, vinyl and carpet.
Tile Calculator
How many tiles for a floor or wall
Laminate Flooring Calculator
How many boxes of laminate flooring
Hardwood Flooring Calculator
How many boxes of hardwood flooring
Vinyl Plank Flooring Calculator
How many boxes of vinyl plank (LVP)
Carpet Calculator
Square yards of carpet for a room
Underlayment Calculator
How many rolls of flooring underlayment
Painting & Walls
Paint, primer, stain, wallpaper and drywall.
Paint Calculator
How many gallons of paint you need
Primer Calculator
How many gallons of primer you need
Deck Stain Calculator
How much stain for a deck or fence
Wallpaper Calculator
How many rolls of wallpaper for a room
Drywall Calculator
How many sheets of drywall you need
Insulation Calculator
How many batt packs of insulation you need
Outdoor & Structures
Fencing, decking, roofing, stairs, lumber and framing.
Fence Calculator
Posts & panels for a fence run
Deck Board Calculator
Boards & linear feet for a deck surface
Baseboard Calculator
How many pieces of baseboard trim
Gutter Calculator
Gutter sections & hangers for your roofline
Crown Molding Calculator
How many pieces of crown molding
Wall Stud Calculator
How many studs for a framed wall
Roofing Calculator
Squares, shingle bundles & underlayment for a roof
Stair Calculator
Risers, treads, stringer length & angle
Board Foot Calculator
Board feet of lumber & total cost
One clear answer, in seconds
Every tool here answers one practical question — how much, how long, or how much will it cost? — from loans, mortgages and taxes to materials, health and quick everyday math. Free, fast, no sign-up, and built to work on your phone.