Home & family tools.

Add up room shapes in square feet and square metres.

Draw walls and rooms, place doors and furniture, measure areas and print a simple plan to scale.

Work out wallpaper rolls from wall size, roll size, and pattern repeat.

Place M1 increases or k2tog decreases evenly across a flat row or round, with exact instructions and a visual strip.

Calculate cast-on stitches, rows, finished width and a pattern-gauge conversion from your own measured swatch, with optional pattern repeats.

Search metric, US, old UK and Japanese knitting needle and crochet hook sizes, including steel hooks and labelled source differences.

Compare CYC yarn categories, estimate weight from wraps per inch and calculate replacement skeins by length, with an optional safety margin.

Work out risers, treads, and the stair angle from the floor-to-floor height.

Convert roof pitch between x/12, degrees, and percent, and get the roof area.

Add up lumber in board feet or cubic metres, with the cost.

The room air conditioner size you need in BTU/h and kW, from the ENERGY STAR chart and adjustments.

Convert ping to square metres and square feet, and Taiwan catties to kilograms.

Convert mu to hectares, square metres, and acres.

How many solar panels cover your electricity use, the system size, roof area, and yearly production. A simplified estimate.

Water in a rectangular, round, or oval pool with a shallow and deep end, in litres, cubic metres, and US and UK gallons.

Plan a monthly budget in needs, wants, and savings, compared with the 50/30/20 rule.

How big your emergency fund should be and when you will reach it.

The cost of a trip per person and per day, with a contingency.

Split a wedding budget into its costs and see the cost per guest.

Split a bill evenly or by item with tax and tip, or settle group expenses: who owes whom, with a share link.

Compare up to six products by price per kilogram, litre, or piece, with ounces, pounds, and multipacks converted, and the best value marked.

Calculate sale prices, stacked discounts, reverse percentages, bundle deals and sales tax with cent rounding.

Monthly and yearly totals of your subscriptions, and what cancelling some would save.

What an appliance costs to run per day, month, and year, from watts, hours, and your price per kWh.

How long an electric car takes to charge, and the cost, from battery, charger, and electricity price.

Estimate flight emissions from selected airports or coordinates, cabin class and passenger count, with and without radiative forcing.

Estimate annual emissions from home energy, car travel, flights and diet, with a breakdown and tips for your largest categories.

When you will be debt-free, and the interest under the avalanche and snowball methods.

Renting against buying year by year, with all the costs, investment returns, and the break-even year.

How much rent you can afford by the 30% rule, the 40× rule, a debt-adjusted 36% limit, and 25% of take-home pay.

Estimate how much house you can afford under two editable debt-to-income limits, including taxes, insurance, HOA and PMI.

Compare current and replacement mortgages by payment, break-even months, total interest and lifetime cost after closing costs and points.

Find a mortgage payoff date and interest savings with extra monthly, yearly and one-time principal payments, plus a full amortisation table.

Estimate a down payment, loan amount and cash needed at closing, and compare 3%, 5%, 10% and 20% down.

Assets minus debts, with monthly records and a trend chart, kept privately in your browser.

Project savings, employer matching and inflation-adjusted retirement withdrawals, with a monthly savings goal.

Compare two tire sizes: diameter, width, sidewall, revolutions per mile, and speedometer error.

A car's estimated value year by year on a declining balance, with a steeper first year, as a chart and a table. A model, not a valuation.

Estimate how many diapers your baby will use until potty training, what they will cost, and how cloth compares.

Work out a child's weekly allowance by age, split it into spend, save, and give jars, and see how long a savings goal takes.

Convert °C, °F, gas marks, and fan oven temperatures, with a gas mark table.

Safe minimum internal temperatures for meat, poultry, fish, and eggs, in °F or °C.

Cups, spoons, and grams for flour, sugar, butter, and more, with USDA weights per cup.

Scale recipe ingredients to any number of servings, in kitchen fractions, with grams.

A weekly meal plan with your dishes and a combined shopping list to print.

Printable recipe cards in 4×6, 5×7, or A6 with ingredients and method.

Your dog's age in human years by the AVMA rule and the 2020 DNA-methylation formula, side by side.

Your cat's age in human years from International Cat Care's chart, with its life stage.

Swap round, square, and rectangular baking pans by area, with the recipe factor and baking time advice.

Bread formulas from baker's percentages to grams, with hydration including the starter, and dough presets.

Coffee and water for pour-over, French press, AeroPress, cold brew, and espresso, with grind, temperature, and a timer.

Litres and gallons in a rectangular, cylindrical, hexagonal, or corner fish tank, and the weight of the water.

Due date and progress for dogs, cats, rabbits, pigs, sheep, goats, cows, horses, and more, from the mating date.

Printable chore, routine, and reward charts for children, with a chart for each child.

A packing checklist for the days, weather, and kind of trip, with children or laundry; tick, add, and print.

Daily or weekly planner pages with time blocks, priorities, to-dos, habits, and notes, to print or save as PDF.

Track up to 12 daily habits, see streaks and a heatmap, and print a monthly sheet or export a local backup.

A month with a column for each family member, to print and fill in.

Build a family tree privately in your browser, import GEDCOM and export charts as PNG or PDF.

Compare US baby-name trends from 1880–2025, with births, ranks, top names by year and similar spellings.

Build a family relationship chain to find Chinese titles, reverse titles and labelled spoken or regional alternatives.

Calculate English family relationships, cousin removals and expected shared DNA from common-ancestor distances.

Print a wallet-size emergency card with your medical details and emergency contacts, front and back.

Compare plugs, nominal voltages and frequencies for your trip, with a searchable country table.

Make a printable pumpkin carving stencil from a face, words, or a photo, with bridges so no piece falls out.

Draw names for a Secret Santa and send each person a private link showing only who they drew, with rules for couples and no sign-up.

Roasting and thawing times for a turkey by weight, stuffed or not, from the USDA's tables, with a schedule back from serving time.

How much food, drink, ice, and tableware to buy for a party, by guests and hours.

Make a printable advent calendar with 24 or 25 days and a note or activity for each.

Design and print a Christmas or New Year card from a design or your photo, as a PDF or image.

Japanese New Year postcards with a vertical greeting, the zodiac sign, and the Reiwa date, ready to print.

Plan holiday gifts per person against a budget, with totals and a spreadsheet download.

Western and Orthodox Easter for any year, with the moveable feasts.

Arrange your own Chinese couplet on red paper, check the ending tones, and print strips, individual characters or a complete set.

Turn a short message into printable letter flags with cutting outlines and hole guides, one or two flags per sheet.

How many plants fit in a bed, in rows or a triangular layout.

Rainwater a roof collects a year and per storm, and the tank to hold it.

Work out how much seed to sow per hectare or acre from the plant target, thousand-seed weight, germination, and field survival.

Find how much fertilizer to spread for a nitrogen, phosphate, or potash target, from the N-P-K numbers on the bag.

How many lumens a room needs, the LED wattage, and how many 60 W-equivalent bulbs that is.

How long a battery lasts from its mAh or Wh and the device's current or power, with real-world losses.

The right TV size for your viewing distance by SMPTE and THX angles, and how close you need to sit for 4K.

Choose a TV diagonal to compare 30°, 36° and 40° viewing distances and one-arcminute pixel estimates for 1080p, 4K and 8K.

Convert throw ratio, lens distance, image width and diagonal, with a zoom distance range for four aspect ratios.

Find the right chair, desk, standing desk, and monitor heights for your height, from average body proportions.

Calculate lease depreciation, finance charges, tax, monthly payments and cash due at signing.

Compare the same car leased or financed over one lease term, including resale and remaining debt.

Find the maximum car price from a monthly budget, running costs, down payment, APR and tax.

Estimate annual and multi-year ownership costs, with depreciation, financing interest and a breakdown chart.

Calculate real-world US MPG, UK MPG and litres per 100 km from one or more fill-ups.

Compare annual EV electricity and petrol costs, home/public charging mix and purchase-premium break-even.

Estimate range from usable battery and consumption, with editable speed, temperature and HVAC reductions.

Estimate reaction, braking and total stopping distance with editable friction, reaction time and road grade.

Read a DOT production week, see an assumed date range and estimate tyre age today.

Compare wheel widths and offsets, convert backspacing and see inner and outer position changes.

Calculate blocks and fabric for a plain-block quilt, including sashing, borders, binding and backing.

Turn a name list or CSV into tent-fold cards with two name faces, a font choice, border, dashed fold lines and cut marks.

Make four to six bookmarks per sheet with text, your quote, a circle pattern or a local image, plus an optional back page.

Use room area or volume and dampness to estimate a historical AHAM water-removal capacity in US pints and litres per day.

Add insulation layers to estimate R, RSI, U-value and steady heat loss, then compare attic recommendations and England Part L limits.

Compare annual heat-pump, gas, oil and resistance-heating costs and CO₂ using your own tariffs, efficiencies and emissions factors.

Plan UPS or battery-bank runtime from a device list, discharge allowance and inverter losses, or find capacity for a target runtime.

Add appliance running and starting watts, then estimate continuous and peak generator ratings with a sizing margin.

Estimate daily dog calories and grams or cups from weight, life stage, activity and the food label.

Estimate cat calories and split them between wet and dry food using editable food-label energy values.