Free calculators that just work
VAT, volumetric weight, GPA, unit conversion, construction quantities, group expenses, countdowns, QR codes, a decision wheel, dice and tally counters. Instant results, nothing to install, your numbers never leave your browser. Each one is also a free Android app.
Tools
VAT Calculator
Free VAT calculator: add VAT to a net price or extract the VAT from a gross price at 1%, 10% or 20%. Withholding tax, profit margin vs markup and commission on the same page.
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Volumetric Weight Calculator
Free volumetric (dimensional) weight calculator: length × width × height ÷ 5000, 4000 or 3000, compared with actual weight to show what the carrier will bill. Multi-parcel totals.
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GPA Calculator
Free GPA calculator on the 4.0 scale: enter courses, credits and letter grades (A+/A- or AA–FF system), see your weighted GPA. Track a running course from midterm and final weights and find the score you need to pass.
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Unit Converter
Free unit converter: inches–cm, miles–km, acres–hectares–m², lb–kg, mph–km/h, gallons–litres, °F–°C, instantly and offline.
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Construction Material Calculator
Free construction quantity calculator: concrete m³ and mixer trucks, rebar kg and bar weight by diameter, paint kg and packs, tile count and adhesive, brick/block count, plaster and screed mortar, and per-m² quick estimates.
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Group Expense Splitter
Split trip, flatmate or dinner costs fairly: record who paid what, see everyone's balance and settle up with the fewest possible transfers. Free, no sign-up, runs in your browser.
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Countdown — Days Until
Free live countdown showing days, hours, minutes and seconds until any date. Add exams, holidays, anniversaries, matches and yearly-repeating events; everything stays in your browser.
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QR Code Generator
Free QR code generator for URLs, text, Wi-Fi passwords, phone numbers, SMS, e-mail and vCard contacts. Instant preview, PNG download, no sign-up — everything is generated in your browser.
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Decision Wheel
Free online spinner wheel: enter 2–12 options, spin and get a random pick. What to eat, who goes first, which movie? No sign-up, runs in your browser.
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Dice Roller
Free online dice roller: roll 1 to 6 dice with one tap, see the total and your recent rolls. For backgammon, Monopoly, Yahtzee and any board game — no sign-up, runs in your browser.
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Tally Counter
Free online tally counter: tap to count, set targets such as 33, 99, 100 or 500 and follow the progress ring. Keep several named counters for reps, inventory, headcounts or prayer beads — no sign-up.
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