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🎬 VideoFree
Streaming services total cost calculator
List every streaming plan on your statement and see the bundle's monthly total plus each fee multiplied by twelve, so the service with the biggest yearly impact…
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❤️ Health & fitnessFree
Bishop Score Calculator
Total the five cervical findings behind the Bishop score: 4 cm dilation, 70% effacement, station -1, a soft cervix and an anterior position score 10, which…
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❤️ Health & fitnessFree
Pediatric BMI z-score calculator
Place a child's BMI on the growth-chart scale: a BMI of 17.2 with reference values L -2, M 16.5 and S 0.08 for that age and sex gives a z-score of almost one…
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❤️ Health & fitnessFree
Corrected reticulocyte count calculator
A 3.5% reticulocyte count with a hematocrit of 25 against a normal of 45 corrects to about 1.944%.
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❤️ Health & fitnessFree
Creatinine clearance calculator
A 50-year-old man weighing 70 kg with a serum creatinine of 1 mg/dL has a Cockcroft-Gault creatinine clearance of 87.5 mL/min.
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❤️ Health & fitnessFree
Due date from CRL ultrasound calculator
A crown-rump length of 32 mm on a scan dated 15 March 2026 puts the pregnancy at 9 weeks and 6 days, with an estimated due date of 12 October 2026.
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❤️ Health & fitnessFree
FIB-4 liver fibrosis calculator
Combines age, AST, ALT and platelets into the FIB-4 liver fibrosis index: a 52-year-old with AST 40, ALT 35 and platelets of 180 lands between 1.3 and 2.67, the…
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❤️ Health & fitnessFree
HOMA-IR insulin resistance calculator
Estimates insulin resistance from one fasting blood draw: glucose of 95 mg/dL and insulin of 10 µIU/mL give a HOMA-IR of 2.346.
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❤️ Health & fitnessFree
IVF transfer due date calculator
Works out the estimated due date from an embryo transfer: a day-5 transfer on 15 March 2026 adds 261 days and lands on 1 December 2026.
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❤️ Health & fitnessFree
Optimal nap length calculator
Pick a 20-minute nap for a short recharge or a 90-minute nap for a full sleep cycle, and see the exact clock time each one ends.
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❤️ Health & fitnessFree
QTc Framingham Calculator
A QT of 400 ms at 75 beats per minute becomes a Framingham QTc of 430.8 ms, with an RR interval of 0.8 seconds.
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❤️ Health & fitnessFree
Wake time after sleep cycles calculator
Going to bed at 22:30 and sleeping 6 full 90-minute cycles means waking at 07:30 the next morning.
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❤️ Health & fitnessFree
Pregnancy weeks to months converter
27 completed weeks of pregnancy are 6 months and 3 weeks when every month counts as exactly four weeks.
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🏠 Home, food & hobbiesFree
Brick wall calculator
In a 10 m² wall of 215 by 65 mm bricks, 10 mm joints take up 1.7185 m² of the face, and the wall needs 623 bricks with 5 percent waste.
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Ceiling joist count calculator
A 144-inch room framed at 16 inches on center needs 10 ceiling joists, 9 full bays plus the closing joist at the far end.
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Collar tie count calculator
A 40 ft ridge with ties every 4 ft needs 11 collar ties: one at each end of the ridge plus one at every spacing mark in between.
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🏠 Home, food & hobbiesFree
Concrete bag calculator
2.5 cubic yards plus 10% waste come to 248 bags of 40 lb, 165 bags of 60 lb or 124 bags of 80 lb of premix.
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Concrete pier calculator
Eight piers 12 inches across and 4 ft deep take just under 1 cubic yard of concrete, also shown in cubic feet, cubic metres and litres.
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🏠 Home, food & hobbiesFree
Corner stud count calculator
A plan with 4 outside corners and 2 interior tees needs 16 extra studs: 12 in three-stud corners and 4 in two-stud tees.
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🏠 Home, food & hobbiesFree
Deck footing count calculator
A 24 × 12 ft deck on a ledger, with posts at most 8 ft apart and beams at most 6 ft apart, needs 8 footings: 2 beam rows of 4 posts.
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🏠 Home, food & hobbiesFree
Drip Edge Calculator
84 ft of eaves and 56 ft of rakes with 10% waste need 154 ft of drip edge, which means buying 16 ten-foot pieces.
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🏠 Home, food & hobbiesFree
Footing concrete volume calculator
A strip footing 12 m long, 0.6 m wide and 0.3 m deep holds 2.16 m³ of concrete, or 144 premix bags at the default yield.
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🏠 Home, food & hobbiesFree
Gutter Flow Capacity Calculator
A 180 m² roof under 75 mm/h of design rainfall sends 4.097 L/s to the gutter with the safety factor, so a half-round profile needs 127.2 mm and the next…
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🏠 Home, food & hobbiesFree
Gutter hanger calculator
A 40-foot gutter run with hangers every 2 feet needs 21 hangers: 20 spaces plus one, so both ends are held.
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🏠 Home, food & hobbiesFree
Joist hanger count calculator
12 joists hung at both ends need 24 joist hangers, while 10 joists hung only at a ledger need 10. Enter how many joists the bay has and how many ends of each…
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🏠 Home, food & hobbiesFree
Lumber Weight Calculator
120 board feet of lumber is 10 cubic feet of wood, and at 35 pounds per cubic foot it weighs an estimated 350 pounds.
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🏠 Home, food & hobbiesFree
Rebar Grid Calculator
A 6 by 4 m slab with bars at 200 mm centres and 50 mm edge cover needs 52 bars, 244.8 m of steel for one layer.
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🏠 Home, food & hobbiesFree
Roof rainwater runoff calculator
A 120 m² asphalt-shingle roof sheds 5,100 litres, or 5.1 m³, in a 50 mm design storm once the 0.85 runoff coefficient is applied.
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🏠 Home, food & hobbiesFree
Roof sheathing calculator
A 1,600 sq ft roof footprint at a 6-in-12 pitch (factor 1.118) with 10% waste needs 62 sheets of 4x8 plywood or OSB.
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Roofing Squares Calculator
1,800 sq ft of roof plan at a 1.118 pitch factor is 2,012.4 sq ft of sloped surface; with 10% waste it comes to 2,213.64 sq ft, or 23 whole squares to order.
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Shingle bundle calculator
22 squares at 3 bundles per square is 66 bundles; add 10% waste for starters, ridge, hips and cuts and you order 73 whole bundles.
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Stair stringer notch layout
Enter 180 mm of rise and 250 mm of run per step and get the notch marks for every step, the spacing between them along the stringer and the pitch angle, plus…
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🏠 Home, food & hobbiesFree
Stone Veneer Calculator
A 240 sq ft wall with 18 ft of outside corners and 10% waste needs 254.1 sq ft of flat stone and 30 corner pieces of 8 in.
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Valley rafter length calculator
A 12-unit common run at a 6/12 pitch gives an 18-unit valley rafter from ridge to plate, because the valley travels on the plan diagonal, √2 times the run.
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🏠 Home, food & hobbiesFree
Aggregate tonnage calculator
10 cubic metres of gravel weigh 16,800 kg, or 16.8 metric tonnes. Enter the volume in cubic metres, yards or feet, pick the material or your supplier's density…
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🏠 Home, food & hobbiesFree
Concrete cost estimator
An 8 cubic yard pour under a 10-yard truck minimum gets the short-load fee added; at 10 yards or more that fee drops to zero.
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🏠 Home, food & hobbiesFree
Corner bead calculator
8 outside corners at 8 ft plus 4 window returns at 5 ft come to 84 linear feet of corner bead, or 92.4 with 10% waste, which means 12 sticks of 8 ft.
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🏠 Home, food & hobbiesFree
Door paint calculator
Six doors of 0.9 × 2.1 m painted on both sides with two coats cover 45.36 m², which at 10 m² per litre takes 4.54 litres.
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🏠 Home, food & hobbiesFree
Polymeric sand calculator
A 40 m² patio of 200 × 100 mm pavers with 5 mm joints needs 7 bags of 20 kg polymeric sand. The joint share is worked out from the paver size, so small pavers…
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🏠 Home, food & hobbiesFree
Primer calculator
Priming 1,200 sq ft at a label coverage of 300 sq ft per gallon with one coat takes exactly 4 gallons.
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🏠 Home, food & hobbiesFree
Tile edge trim calculator
A backsplash whose three exposed edges add up to 11 linear feet needs 12.1 ft of trim with 10% waste, or 7 stock pieces of 2 ft.
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➗ MathFree
Fourth root calculator
The fourth root of 16 is exactly 2, and the fourth root of 10 is 1.778279410039. Enter any non-negative number and get the value that, used four times as a…
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🏠 Home, food & hobbiesFree
Tile backer board calculator
100 square feet of shower wall with 3 by 5 foot sheets and 10 percent waste takes 8 cement boards.
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🏠 Home, food & hobbiesFree
Dehumidifier sizing calculator
An 850 sq ft space that is very damp calls for 18 pints per day, so look for a unit rated at 20 or more.
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🏠 Home, food & hobbiesFree
Epoxy floor coating calculator
A 400 square foot slab with kits covering 250 square feet each needs 2 kits once 10% waste is added, with 60 square feet of coverage to spare.
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Flooring underlayment calculator
A 25 m² room with 10 m² rolls and the default 5% waste needs 3 rolls of underlayment, leaving 3.75 m² on the last one.
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🏠 Home, food & hobbiesFree
Furnace sizing calculator
A 2,000-square-foot home at 45 BTU per square foot needs a 90,000 BTU-per-hour furnace. Enter the heated floor area and a climate factor, or pick your climate…
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🏠 Home, food & hobbiesFree
Insulation batt calculator
Covering 1,200 square feet with R-38 batts that fill 64 square feet per bag takes 18.75 bags, so you buy 19 bundles and have 16 square feet to spare.
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🏠 Home, food & hobbiesFree
Insulation cost estimator
Insulating 1,000 square feet to R-30 with R-15 batts takes two layers, and a 10% waste allowance brings the purchase to 2,200 square feet.
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🏠 Home, food & hobbiesFree
Peel-and-stick wallpaper calculator
Covering 240 sq ft of wall with rolls of 28 sq ft each, plus 10% for pattern matching, takes 10 rolls.
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🏠 Home, food & hobbiesFree
Recommended R-value calculator
In IECC climate zone 5 the recommended targets are R-49 for the attic, R-15 for walls and R-30 for floors.
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🏠 Home, food & hobbiesFree
Room CFM calculator
A 2,400 cubic foot bedroom at 6 air changes per hour needs 240 CFM of supply air: volume times ACH, divided by 60.
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🏠 Home, food & hobbiesFree
Window casing calculator
Four windows of 36 by 60 inches need 64 linear feet of casing, 16 feet each. Enter the opening size where the trim will run and how many identical windows you…
K
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➗ MathFree
Fractional exponent calculator
8 raised to the power 2/3 is 4: the cube root of 8 is 2, and 2 squared is 4. Type the base and the two whole numbers of the fraction, which is reduced first, so…
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➗ MathFree
Frustum cone area
With radii of 3 and 4 and a slant height of 5, a truncated cone has a side area of 109.9557428756 and a total surface of 188.4955592154.
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Conductor ampacity derating calculator
With eight current-carrying conductors in one raceway, a 75-ampere wire falls in the 70 percent band and is derated to 52.5 amperes.
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Thermal Expansion Tank Calculator for Water Heaters
A 50-gallon water heater on 60 psi cold pressure has to absorb 0.948 gallons of expanded water, so the calculator recommends a 2-gallon tank after a 10% margin.
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Generator sizing calculator
A fridge, sump pump, LED lights and router draw 1,180 running watts; add the fridge's 1,000-watt start and the peak is 2,180 W, so with headroom you need 2,725…
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Outlet spacing calculator
A 40-foot wall line under the common 6-foot rule needs at least 4 receptacles. Enter the wall length that counts and the greatest distance allowed to an outlet…
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🏠 Home, food & hobbiesFree
Pipe water velocity calculator
Two litres per second through a 25 mm bore moves water at just over 4 m/s, past the 2.5 m/s mark where home pipes turn loud and wear fast.
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