Everyday Calculators
The small calculations that come up constantly — tips, splits, discounts, grades, fuel costs and number conversions.
18 tools, all running in your browser.
Fig 1 Turn the crank, read the tip
Move across to turn the crank · ← →
Multiplying is adding, turn by turn and place by place: 80.00 × 0.15 is five turns of 0.80 and one of 8.00. The everyday calculators here do the same sums, and show them.
Most used
GPA Calculator Turn letter grades and credit hours into a 4.0 GPA, add honours and AP weighting, roll it into your cumulative average and solve for a target GPA. Percentage Off Calculator Answer "what is 20% off $80?" instantly, with the amount saved, the price you pay, an optional tax line and a table of every common discount on your price. Tip Calculator Work out the tip and the total in a second: quick percentage presets, a slider, pre-tax tipping, round-up options and an exact per-person split.
Everything else
Bill Split Calculator Split any restaurant bill evenly or item by item, share dishes between people, spread tax and tip proportionally, and see exactly what each person owes. Coin Flip Flip a fair coin with an animated toss, or run up to 10,000 flips at once and watch the heads share converge on 50% in a live fairness chart. Concrete Calculator Work out concrete volume in cubic yards, cubic metres and bags for slabs, footings and post holes, with a waste allowance. Dice Roller Roll any dice notation — 3d6+2, 1d20, 4d6kh3 — with animated results, keep-highest support, roll history and a live distribution of the totals you rolled. Discount Calculator Find the sale price, the amount saved and the true discount after stacked coupons and tax — plus reverse modes for the original price or the % off. Flooring Calculator Convert room measurements into the number of flooring boxes to buy, including a waste allowance and the total material cost. Fuel Cost Calculator Estimate the fuel cost of a drive in MPG or L/100km, split it between passengers, add the return leg, and compare two vehicles on the same journey. Grade Calculator Calculate your current class grade from weighted categories or raw points, then solve for the exact score you need on the final exam to hit your target. Number to Words Converter Spell any number out in English — cardinal, ordinal or cheque-writing currency wording — with lakh/crore support and a words-back-to-digits reverse mode. Paint Calculator Work out how much paint a room needs from wall dimensions, coats and coverage, with doors and windows deducted automatically. Random Picker Paste any list and draw winners at random with no repeats, add weights, or shuffle the whole list — using cryptographic randomness, on your device. Roman Numeral Converter Convert numbers to Roman numerals and back, from 1 to 3,999,999, with strict validation, the vinculum overline convention explained and a reference chart. Sales Tax Calculator Add sales tax to a price or back it out of a total, using a built-in table of US state rates, an editable local rate, or any VAT or GST rate you enter. Square Footage Calculator Measure several rooms at once in feet, inches or metres, add a waste allowance and a cost per square foot, then export the list. Tile Calculator Turn floor and wall measurements into a tile count and a number of boxes, allowing for grout joints and cutting waste.