Clear School & everyday math, explained
Percentage Calculator
Six modes: of, as %, increase, decrease, change & difference.
Fraction Calculator
Add, subtract, multiply & divide — with steps shown free.
Scientific Calculator
Trig, logs, powers, factorials, memory & history tape.
GPA Calculator
Compute your grade point average from courses.
Final Grade Calculator
The score you need on the final — or your grade if you get X.
Test Grade Calculator
What you need on the final — needed, safe, or out of reach.
Standard Deviation Calculator
Mean, median, mode & SD — paste data or upload a CSV.
Age Calculator
Exact age, days lived & next birthday countdown.
Date Calculator
Days between dates, add/subtract & business days.
Time Duration Calculator
Hours between times; add & subtract durations.
Hours Calculator
Between two clock times — overnight-safe, decimal hours & pay.
Days Until Calculator
Count down to any date — or count up from a past one.
Tip Calculator
Split the bill and tip fairly in seconds.
Discount Calculator
Sale price, savings & total with tax.
Unit Price Calculator
Compare products by price per oz, lb & more.
Sales Tax Calculator
Add sales tax to any price instantly.
Currency Converter
Live rates for 30+ currencies, with swap & quick amounts.
Hourly to Salary Converter
Convert hourly wage ↔ annual salary.
BMI Calculator
Body mass index, imperial & metric.
Calorie Calculator
TDEE for your goal, with protein, carb & fat targets.
Body Fat Calculator
US Navy tape method: body fat %, category, fat & lean mass.
BMR Calculator
Three BMR formulas side by side, plus TDEE by activity.
Macro Calculator
Protein, carb & fat grams for balanced, high-protein, low-carb or keto.
Sleep Calculator
Bedtimes & wake times in 90-minute sleep cycles.
Ovulation Calculator
Fertile window, ovulation day & a 3-cycle calendar.
Pregnancy Due Date Calculator
Due date from LMP, conception or ultrasound — plus milestones.
Dog Age Calculator
Human years on the modern log model — not the flat ×7 myth.
Word Counter
Count words, characters & reading time instantly.
Random Number Generator
Numbers, coin flips & dice rolls with unique/sorted options.
Password Generator
Strong random passwords, generated locally.
Money, explained step by step
Cap Rate Calculator
Measure a rental property's return in seconds.
Cash-on-Cash Return Calculator
See what your actual cash invested earns each year.
Mortgage Payment Calculator
Monthly payment, total interest & payoff schedule.
Rental Property Analyzer
Full deal analysis: cash flow, cap rate, CoC return.
ROI Calculator
Measure return on investment & annualized ROI.
Break-Even Calculator
How many units you must sell to break even.
Home Affordability Calculator
Max home price from income, debts & rate.
Debt Payoff Calculator
See when you'll be debt-free & interest saved.
Car Loan Calculator
Auto payments, total interest & true cost.
Refinance Calculator
Should you refinance? Savings & break-even.
Savings Goal Calculator
Monthly deposits to hit any savings target.
Credit Card Payoff Calculator
Months to debt-free & total interest cost.
Salary Raise Calculator
New salary, raise amount & per-paycheck.
Freelance Hourly Rate Calculator
Price your work from your real income goal.
Invoice Generator
Create a clean, printable invoice in a minute.
Compound Interest Calculator
Watch savings and investments grow over time.
Mileage Deduction Calculator
Estimate your IRS mileage deduction for 2026.
Quarterly Tax Estimator
Estimate self-employment quarterly payments.
Business Loan Calculator
Payments, total cost & amortization for business loans.
Love Calculator
A name-match score that never changes — computed, not random.
Electricity Cost Calculator
What any appliance costs to run, by watts & hours.
Overtime Calculator
Time-and-a-half & double time — weekly, monthly, annual gross.
Down Payment Calculator
Cash to close: down payment, closing costs & the PMI line.
Debt Snowball Calculator
Snowball vs avalanche on your debts, raced side by side.
Debt Avalanche Calculator
Up to six debts: avalanche vs snowball raced side by side.
APR Calculator
The true APR once fees count — plus the loan’s total cost.
Inflation Calculator
Future prices & today’s-money values — both directions at once.
Trump Accounts Calculator
The $1,000 federal seed for children born 2025–2028, plus family and employer contributions, projected to age 18 with a year-by-year table.
AI Job Risk Calculator
Your week scored task by task — which tasks AI can reach and which anchor you, weights shown openly.
Time Card Calculator
A full 7-day timesheet: overnight shifts, 15-minute rounding, daily and weekly overtime without double-counting, gross pay.
LLM API Token Cost Estimator
Price the same AI workload across GPT-5, Claude and Gemini list prices — caching and words-to-tokens included.
Payment Fee Calculator
Stripe, PayPal and Square fees: what you net, what volume costs, and the gross-up charge that nets you exactly $X.
YouTube Earnings Calculator
Views × honest RPM ranges by niche — long-form and Shorts priced separately, low/mid/high.
TikTok Earnings Calculator
View rewards with the qualified-views share most calculators skip, in labeled ranges.
Sponsorship Rate Calculator
Price a sponsored post or video from views, engagement, niche and scope — every multiplier shown.
Buy vs Lease Car Calculator
True monthly cost of leasing vs buying over your horizon — resale equity counted, mileage overage priced.
Cash-Out Refinance Calculator
New payment, total-interest change and break-even when you refinance and take cash out.
HELOC vs Home Equity Loan Calculator
Draw-period interest-only vs a fixed installment loan — total cost of both structures on the same dollars.
Car Total Cost of Ownership Calculator
Five-year cost of owning: payments, depreciation, fuel, insurance and upkeep — per year and per mile.
Repair vs Replace Calculator
Cost per added year for the repair vs the replacement, with the 50%-of-value rule shown as a guideline.
EV vs Gas Calculator
Price premium after incentives vs fuel and maintenance savings — the break-even year, in your prices.
Closing Cost Estimator
Itemized closing costs — lender, title, government, prepaids and escrows — low/mid/high, by state.
EV Charging Cost Estimator
Home charging cost with charging losses included, against the same miles in a gas car.
Home projects & estimators
Concrete Calculator
Yards, bag counts & cost for slabs, footings, tubes & steps.
Square Footage Calculator
Four shapes, a rooms list & cost per sq ft totals.
Tile Calculator
Tiles, boxes & cost — grout gap and 10% waste included.
Gravel Calculator
Cubic yards, tons & bags for driveways and paths.
Mulch Calculator
Cubic yards & bags for garden beds, costs compared.
Drywall Calculator
Sheets, screws & cost for any room — ceiling in or out.
Flooring Calculator
Boxes with waste counted, plus the true material cost.
Paint Coverage Calculator
How many gallons for your room & coats.
Deck Material Estimator
Boards, screws & concrete for your deck.
Roofing Estimator
Roof area from footprint and pitch — shingle bundles, squares, underlayment rolls, ridge cap and nails.
Brick Estimator
Bricks and mortar bags for any wall, by brick size and joint thickness.
Concrete Block Estimator
CMU blocks and mortar bags for any wall — standard, half-high and 12-inch block.
Insulation Estimator
Batt packages or blown-in bags by area and target R-value, R-13 to R-49.
Siding Estimator
Siding squares, boxes, planks or lap from your walls minus the openings.
Fence Estimator
Posts, rails, pickets and concrete bags for any fence run.
Carpet Estimator
Carpet and padding in square yards for one or two rooms, roll length included.
Wallpaper Estimator
Rolls by room size with pattern-repeat waste honestly counted.
Topsoil Estimator
Cubic yards, tons and bags for beds and lawns by area and depth.
Sand Estimator
Sand in yards, tons and 50-lb bags — densities by sand type.
Paver Estimator
Pavers plus gravel base, bedding and jointing sand — the whole patio list.
Sod Estimator
Sod pallets and rolls by lawn area, cutting waste included.
Board Foot Estimator
Board feet from dimensions and quantity, priced at your rate per board foot.
Stair Estimator
Risers, treads, total run and stringer length from your floor-to-floor rise.
Pool Volume Estimator
Gallons for rectangular, round and oval pools from dimensions and depth.
Countertop Estimator
Counter square feet, slab count and installed cost from your runs.
Asphalt Estimator
Hot-mix tons and cubic yards by area and compacted depth — plus the coverage-per-ton check for quotes.
Grass Seed Estimator
Pounds and bags by grass type — new-lawn and overseed rates for bluegrass, fescue, ryegrass, bermuda and blends.
Retaining Wall Estimator
Segmental blocks, cap blocks and the gravel — base plus drainage backfill — for any wall.
Framing Estimator
Studs and plates for any wall — corners, openings and the end stud everyone forgets, counted.
Rebar Estimator
Slab grid bars each way, 20-ft sticks and total steel weight by spacing and bar size.
Stone Estimator
River rock and decorative stone in tons, yards and 50-lb bags, with coverage per ton.
Plywood Estimator
4×8 (and larger) sheet counts for floors, roofs and walls with the cutting allowance in.
Roof Pitch Calculator
Pitch to angle to slope percent, the roof-area factor, and rafter length per foot of run.
Metal Roofing Estimator
Panel count and length, screws and ridge for a gable roof — ag panel or standing seam.
Concrete Block Fill Estimator
Core-fill grout yards by block size and fill pattern, with the 80-lb bag equivalent.
Concrete Mix Estimator
Cement bags, sand and aggregate for any volume at 1:2:4, 1:1.5:3 and other standard ratios.
Baluster Estimator
Baluster count at the 4-inch code gap, with the true spacer-block size for an even layout.
Deck Stain Estimator
Stain gallons and quarts by deck size, wood condition and coats — railings counted, not guessed.
Epoxy Estimator
Mixed resin volume by dimensions and pour depth, in the 1- and 3-gallon kits stores sell.
Plant Spacing Estimator
Plant counts for any bed by spacing — square grid or staggered — spares included.
French Drain Estimator
Drainage gravel in yards and tons with pipe volume subtracted, plus pipe and fabric lengths.
Tank Volume Estimator
Gallons and litres for rectangular and round tanks, the full water weight, and substrate bags.
BTU Estimator
Heating and cooling loads by area, climate zone, insulation, sun, occupants and kitchen.
Roof Replacement Cost Estimator
Full tear-off and replacement cost ranges by material and complexity.
Bathroom Remodel Estimator
Bathroom remodel ranges by size and finish tier, fixtures itemised.
Kitchen Remodel Estimator
Kitchen remodel ranges by tier — cabinet and counter shares spelled out.
Home Renovation Estimator
Whole-home renovation ranges by area and scope: cosmetic, full or gut.
Deck Cost Estimator
Installed deck cost by material — platform, railing and stairs itemised as separate lines.
Fence Cost Estimator
Installed fence cost per foot by material, with gates and tear-out priced separately.
Driveway Cost Estimator
Asphalt, concrete, gravel or paver driveway cost installed, tear-out as its own line.
Siding Cost Estimator
Vinyl, fiber-cement, wood or stucco siding cost by wall area, tear-off itemised.
Painting Cost Estimator
Pro interior and exterior painting ranges plus the paint gallons — DIY vs pro on one screen.
Window Replacement Cost Estimator
Installed cost per window by type and frame material — quote-check any window company.
Gutter Cost Estimator
Gutter cost by material per foot, downspouts each, guards as a separate honest line.
Shed Cost Estimator
Kit, prefab or custom shed cost by footprint — the three build routes priced separately.
Home Addition Cost Estimator
Room additions, bump-outs, second stories, garage conversions and sunrooms by type and area.
House Building Cost Estimator
New-home build cost by tier and region factor — land excluded and stated.
HVAC Cost Estimator
AC, furnace, heat pump and mini-split replacement cost scaled by tonnage.
Water Heater Cost Estimator
Tank, tankless and heat-pump water heater replacement cost by type and size.
Water Bill Estimator
Your water + sewer bill built fixture by fixture — showers, flushes, laundry — at your local rate.
House Cleaning Cost Estimator
Per-visit cleaning price by size, bedrooms and service type, frequency discounts applied.
Lawn Care Cost Estimator
Mowing per visit by lawn size and the full season — fertilisation and leaf cleanups itemised.
Solar Cost Estimator
System size, panels, gross and net cost, yearly savings and honest payback from your usage.
EV Charging Cost Estimator
Home charging cost with charging losses included, against the same miles in a gas car.
Moving Cost Estimator
Compare movers vs DIY truck rental.
Home Renovation Estimator
Whole-home renovation ranges by area and scope: cosmetic, full or gut.
Wedding Cost Estimator
Wedding total by guest count and category, contingency and per-guest cost included.
College Cost Estimator
Future college cost year by year, your savings credited, the monthly gap deposit.
Pet Cost Estimator
First-year and lifetime cost of a dog or cat, by size and monthly spend.
Trip Cost Estimator
The full vacation total — transport, lodging, food, activities — split per person.
Solar Cost Estimator
System size, panels, gross and net cost, yearly savings and honest payback from your usage.
Home Addition Cost Estimator
Room additions, bump-outs, second stories, garage conversions and sunrooms by type and area.
House Building Cost Estimator
New-home build cost by tier and region factor — land excluded and stated.
HVAC Cost Estimator
AC, furnace, heat pump and mini-split replacement cost scaled by tonnage.
Water Heater Cost Estimator
Tank, tankless and heat-pump water heater replacement cost by type and size.
Water Bill Estimator
Your water + sewer bill built fixture by fixture — showers, flushes, laundry — at your local rate.
House Cleaning Cost Estimator
Per-visit cleaning price by size, bedrooms and service type, frequency discounts applied.
Lawn Care Cost Estimator
Mowing per visit by lawn size and the full season — fertilisation and leaf cleanups itemised.
Catering Estimator
Food and drink quantities per guest — protein and sides in pounds, drinks, ice, beer and wine.
Moving Cost Estimator
Compare movers vs DIY truck rental.
Paint Coverage Calculator
How many gallons for your room & coats.
Work & small business
LLM API Token Cost Estimator
Price the same AI workload across GPT-5, Claude and Gemini list prices — caching and words-to-tokens included.
YouTube Earnings Calculator
Views × honest RPM ranges by niche — long-form and Shorts priced separately, low/mid/high.
TikTok Earnings Calculator
View rewards with the qualified-views share most calculators skip, in labeled ranges.
Sponsorship Rate Calculator
Price a sponsored post or video from views, engagement, niche and scope — every multiplier shown.
Freelance Hourly Rate Calculator
Price your work from your real income goal.
Invoice Generator
Create a clean, printable invoice in a minute.
Compound Interest Calculator
Watch savings and investments grow over time.
Payment Fee Calculator
Stripe, PayPal and Square fees: what you net, what volume costs, and the gross-up charge that nets you exactly $X.
Mileage Deduction Calculator
Estimate your IRS mileage deduction for 2026.
Quarterly Tax Estimator
Estimate self-employment quarterly payments.
Business Loan Calculator
Payments, total cost & amortization for business loans.
Why Clear Math?
Every tool runs entirely in your browser — your numbers never leave your device.
Guides & articles
Get Out of Debt: Avalanche vs Snowball
Two proven payoff orders, one worked $500-a-month example, and how to pick the one you’ll finish.
Calculate a Mortgage Payment by Hand
The formula, a full worked example, and how to check your lender’s quote in minutes.
Compound Interest, Explained With Real Numbers
How $10,000 and $200 a month actually grow over 10, 20 and 30 years — plus the rule of 72.
Percentages Without a Calculator
The 10% anchor trick, reverse percentages and stacked discounts — mental math that works anywhere.
Why Our Calculators Solve Backwards Too
Most calculators answer one way. Ours solve for whichever number you’re missing — here’s why.
Mathway Alternatives: Free Step-by-Step Math Help
Need the working shown, free? An honest comparison — including where Mathway is stronger.
HELOC: Draw vs Repayment, With Real Numbers
Interest-only payments, then an 82% payment jump — both phases of a $20,000 line, priced.
How to Read an Amortization Schedule
What every column means, where the interest hides, and the month principal finally wins.
Calculator.net Alternatives
Two decades and ~200 tools, honestly credited — and the solve-backwards workflow we built instead.
How Much House Can I Afford?
The 28/36 rule worked end to end — and why your tax bill, not your salary, sets the ceiling.
How to Calculate Overtime Pay
Time-and-a-half and double time in three buckets, with a full worked week at $20 an hour.
CD vs Savings Account
The APY gap on $10,000 over five years, the penalty priced, and the ladder that splits the difference.
💾 My saved calculations
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