Free online calculators

Percentages, VAT, zakat, dates and working days, unit and currency conversion, early loan settlement, admission score, calorie and water needs, and a bill split. No sign-up and no adverts.

Air Conditioner Size Calculator — Work out the cooling a room needs here rather than in a temperate country — the rule of thumb the American calculators use is about a third of what a Gulf summer asks for. Adjusts for sun, top floor, ceiling height and occupants, converts tons to BTU, rounds to a size you can buy, and warns when that size will short-cycle instead of dehumidifying.
Fuel Cost Calculator — Work out the fuel for a trip in whatever unit your car shows — km per litre off the dashboard, litres per 100 km off the spec sheet, or miles per gallon in either of the two gallons that differ by a fifth. Pick a route or type a distance, split it between passengers, and see whether 95 is worth its extra over 91.
GPA Calculator — Work out a GPA course by course on the Saudi 5.00 scale or on 4.00, with the overall classification and your cumulative average — and convert between the scales grade by grade rather than with the shortcut every other site uses. Your marks stay in your browser.
Percentage Calculator — Answer the common percentage questions instantly: what is X% of Y, X is what percent of Y, and the percentage increase or decrease from one number to another. Runs entirely in your browser.
Bill Splitter — Split a restaurant or group bill fairly: add an optional tip percentage, set how many people are paying, and see the per-person share and the grand total. Runs entirely in your browser.
VAT Calculator — Add or remove Saudi VAT (15% default, 5%/0% presets) — net, VAT and gross in SAR to the halala, with a copyable breakdown. Bilingual, in-browser.
Unit Converter — Convert length, mass, temperature, data, area, volume, speed and time — live, with swap + copy. Exact tables; temperature with proper offsets.
Currency Converter — Convert between the Saudi Riyal and world currencies at up-to-date daily reference rates — swap direction in a tap. Rates from a free public feed, cached for offline use; your amounts never leave your browser.
Tap BPM — Find a track’s tempo by tapping along. It averages over a sliding window so it follows a tempo change instead of burying it, and it tells you how steady your tapping was. It also gives the quarter, eighth and dotted-eighth times in milliseconds, which is what a delay pedal wants.
Sound Level Meter — A live level meter using your microphone, with a running graph and peak hold. It shows relative loudness in dBFS, not calibrated decibels — a browser cannot know which microphone it is behind or what gain the system applied. Good for comparing two rooms; not for judging whether a workplace is safe.
Coordinate Converter — Paste coordinates in any common form — decimal, degrees-minutes-seconds, or degrees and decimal minutes — and get every other form back, including UTM and MGRS for survey and field maps. Add a second point for the distance and bearing between them.

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