141 calculators across 16 categories. Tap ♡ on any card to save your favorites.
Construction
Slabs, footings, columns - cubic yards + bags.
Grid layout, total feet, lap splice, tie wire count.
Bricks needed + mortar bags for any wall area.
Concrete blocks + mortar for a block wall.
Grout volume for any tile floor or wall.
Blocks + cap stones for a retaining wall.
Pavers + sand base for a patio or walkway.
Anchor bolts spacing for a wood sill plate.
Concrete bags per post hole by hole size + post.
Rebar grid spacing + total linear feet for a slab.
Studs, plates, and headers for any wall.
Lumber volume + cost. Hardwood pricing made easy.
Bar, plate, and tube weight in lb and kg.
Boards + screws for any deck size.
Stud depth (3-5/8â€, 4â€, 6â€) + gauge for any deck height. 20 ga to 12 ga options.
Sheets of plywood needed by area + waste.
Floor joist count + lumber needed by span.
Rough opening dimensions for any door size.
Rise/run, angle, slope %, and rafter length.
Bundles of shingles + underlayment + ridge cap for any roof.
Squares of siding plus J-channel and starter strips.
Linear feet of gutter + downspouts by roof size.
Sheets, screws, mud, and tape for any room.
Gallons for your room. Doors & windows handled.
Tiles + waste % for any floor or wall.
Square yards needed with waste factor and cost.
Order sheet for Hilti firestop: CP 606 / CP 672 spray / FS-One Max / CP 777 deck plugs / mineral wool.
Recommended R-value + how thick that is in fiberglass or foam.
Dirt volume in cubic yards + dump truck loads.
Room or lot size - rectangle, circle, or triangle.
Cubic yards and tons of crushed stone for any project.
Tons of hot-mix for driveways and parking.
Posts, pickets, rails, and concrete for a wood fence.
Size tank water heater by fixture demand + First Hour Rating (FHR). Showers, tubs, sinks, dishwasher, pipe size.
Gallons of water inside any pipe by diameter + length.
Grain capacity needed by household + hardness.
Minimum copper wire AWG for any amperage + distance.
Breaker + wire + service room for EV Level 2 install.
Whole-home backup sizing by running watts of all appliances.
Whole-home heating + cooling load estimate (simplified).
Door weight by material, size, insulation - for spring sizing.
IPPT, wire gauge, and spring length from door weight + drum.
HP / torque opener rating from door weight and panel size.
Tape-measure math - add, subtract, multiply feet-inch-fractions.
IBC / ASCE 7 §13.5.6 compliance checklist + quantities for any suspended ceiling.
Verify any rectangular layout is perfectly square — pools, slabs, decks, sheds. Diagonal check + live diagram + adjustment guide.
Trailer weight vs vehicle towing rating with safety margin.
Stringer + riser + tread, with IRC code check.
Architecture
Max span for 2x lumber and LVL by species and load.
Reference tables - max spans for 2x, built-ups, and LVL across species and loads.
Heavy timber (6x6 to 12x14) - oak, Doug Fir, white pine with connection derates.
L, T, U, trapezoid, and circular pours - cubic yards + cost.
Simplified heating + cooling BTU/h by climate zone and envelope.
Tech & Energy
Years to ROI for any solar install with tax credits + escalator.
Real range by speed, temperature, and load.
10-year true cost: EV vs gas including maintenance, fuel, depreciation.
Education
Reading ease + grade level scores for any text. Used by teachers, the military, and writers.
Balance any chemical equation automatically with full work shown.
Maker & Reference
4-band, 5-band, and 6-band color code decoder with visual band picker.
Safe working load for any rope by material + diameter.
Haversine formula distance between any two lat/long points. Miles, km, nautical miles, bearing.
Convert sq ft, sq m, hectares to acres and back.
Solve for any side of a right triangle.
Real Estate
True cost: monthly rent vs owning with mortgage, tax benefits, and appreciation.
Max purchase price based on income, debt, down payment, and DTI.
Home
Aquarium volume in gallons + liters from tank size. Plus filter GPH, heater wattage, weight loaded, fish stocking.
BTU recommendation for any room.
What that appliance costs you per month.
Meat, sides, drinks, ice for your cookout.
Lifetime savings from switching to LED bulbs.
BTU output by cord type and burn rate.
How long a home battery powers your essentials.
Pool
Amps and breaker size for pump + heater + lights combined.
Gallons in your pool - rectangle, round, or oval.
Chlorine, pH, and alkalinity doses for your pool.
Health
WHtR risk assessment in seconds.
How long to lose X pounds at a given deficit.
Daily protein target by goal (cut, maintain, bulk).
Pace, time, distance - with race preset buttons.
MET-based calorie burn for 30+ activities.
Estimate 1RM from rep test + training percentages.
Body Mass Index in metric or imperial.
BMR + TDEE using Mifflin-St Jeor.
Protein, carbs, fat grams by goal and split.
US Navy tape method, with category ranges.
Daily water target by weight, activity, climate.
Optimal wake time + bedtime based on 90-minute sleep cycles. Wake up rested, not groggy.
Finance
Year-by-year break-even. When does buying beat renting?
Future value with periodic contributions and compounding.
Time to debt freedom under each method with cost comparison.
How long or how much per month to reach a target.
True 10-year cost of any car: depreciation + fuel + maintenance + insurance.
Allocate income to needs/wants/savings.
Lifestyle
What does going to the office actually cost you per year?
Food & Kitchen
Weight × temp × cut → estimated finish time.
Work backwards from your serve time to know when to start the cook.
How much wood, charcoal, or pellets for X hours at X temp.
How much pulled pork comes off a bone-in shoulder.
Salt-to-water ratio by volume — for any brine batch size.
How many briskets, ribs, butts, or chickens fit on your smoker.
Scale a pasta salad recipe for any number of guests. 6 styles + optional protein.
Swap butter ↔ oil ↔ shortening ↔ applesauce with ratios.
Safe thawing time by weight + method (fridge, cold water, microwave).
Cook time for any turkey size at any oven temp.
Marinade volume + balance for any meat quantity.
Baker percentage math for any sourdough. Flour, water, starter, salt + timing by kitchen temp.
Coffee-to-water ratio for any brew method.
Convert a recipe between pan sizes.
Scale any ingredient list up or down.
Baker's % math for any pizza style.
Recipe adjustments by elevation.
Bakers percent hydration for any flour + water amount.
Alcohol By Volume from OG and FG readings.
Plan a BBQ for any guest count: proteins, sides, drinks, cups, napkins, ice — all sized to your crowd.
Plate counts and food weights by event size.
Interactive board builder: guest count + style + checkbox items → shopping list with quantities + costs.
92 cocktails, 25+ vessels, ice displacement, ABV, cost - the ultimate party drink calculator.
Math
Exact age in years, months, days, and seconds.
Monthly payment + total interest with tax and trade-in.
Percent of, what %, percent change - all in one.
Add, subtract, multiply, divide fractions.
Bill + tip % + split between people.
Add tax or strip it back out of any total.
Monthly payment + total interest for any loan.
PITI: principal, interest, tax, insurance, PMI, HOA.
Simple or compound, with monthly contributions.
Trip cost + monthly commute cost.
Weighted GPA with as many courses as you want.
Unit price for grocery comparison shopping.
Garden
C:N ratio for hot compost using browns + greens.
NPK rate, lawn size → pounds of fertilizer.
Cubic yards of mulch for any garden bed.
Soil for raised beds and planters, with presets.
How many plants fit in your bed at any spacing.
30-year mechanic in your pocket - step-by-step diagnosis for mowers, chainsaws, generators, more.
Pounds of N per 1000 sqft from any NPK ratio fertilizer.
Trading Cards
Is grading worth it? Fees vs raw-to-graded value bump.
Total grading cost across tiers - fees, shipping, insurance.
eBay/PWCC/COMC fees - what your card has to sell for.
Fair-share box break pricing - by team, division, or random.
Photography
DoF, hyperfocal, near + far focus limits.