Everyday calculators
Tip, GPA, pace, attendance, recipe scale, wind chill, heat index, and related figures from values you type.
21 tools
In this group
Money and school: tip, split bill, cash counter, GPA, final grade, and attendance. Kitchen: recipe scale. Motion: pace, speed, distance, and time, and haversine great-circle distance. Fuel: fuel cost and mpg. Apparent temperature: wind chill and heat index. Power, files, and parcels: electricity cost, download time, and volumetric weight. Frames: aspect ratio.
- Aspect Ratio Calculator Width and height reduce by their greatest common divisor. You also get a decimal ratio, landscape or portrait, and optional scale to a target side. This is not crop advice.
- Attendance Calculator Present divided by total sessions is the attendance percent. You also type a minimum percent. The page counts absences used, absences allowed at that minimum, and how many absences remain. This is not a school SIS.
- BTU Heating Calculator Estimate heating load in BTU per hour from floor area, climate preset, and insulation quality. Optional ceiling height reports room volume. Rule of thumb only. Not Manual J.
- Cash Counter Count notes and coins, then the page multiplies each count by a fixed denomination. Pick USD or EUR. The tables are static. This is not a currency converter and not a cash-register certification.
- Recipe Scale Calculator Type original servings, new servings, and one ingredient per line with the amount first. The scale factor is new / original. Only a leading number multiplies. Cups to grams is the cooking converter, not this list scaler.
- Dew Point Calculator Estimate dew point from air temperature in °C and relative humidity. Uses the Magnus-Tetens approximation with a = 17.625 and b = 243.04. Not a weather forecast or HVAC design.
- Download Time Calculator Time to transfer a size at a rate you type. Not a speed test.
- Electricity Cost Calculator Cost equals kilowatt-hours times the rate you type. If kWh is blank, energy is watts times hours times days over 1000. This is not a utility bill.
- EV Charging Cost Calculator Estimate energy needed to charge an EV pack and multiply by your $/kWh rate. Default 75 kWh battery from 20% SOC at $0.15/kWh fills 60 kWh for about $9. Optional trip miles use efficiency. Not a utility bill.
- Fuel Cost Calculator Gallons or liters for a trip, then cost at the price you type. This is not a live station feed and not a fuel unit converter.
- GPA Calculator One course per line: grade and credits, such as A 3 or 3.7 4. Default letters use a 4.0 scale. Your school may differ.
- Final Grade Calculator Score needed on remaining work, or GPA needed on new credits, to hit a target.
- Haversine Distance Calculator Great-circle distance on a sphere of radius 6371.0088 km (IUGG mean). Type two WGS-style latitudes and longitudes in degrees. This is not driving directions, not rhumb line, and not a geodesic on the WGS 84 ellipsoid.
- Heat Index Calculator National Weather Service Rothfusz regression with the published humidity adjustments. Type air temperature in Fahrenheit and relative humidity percent. Below the 80 °F simple-average gate the page uses the Steadham-style average. Not a medical warning product.
- MPG Calculator Fuel economy from a trip distance and the fuel you used. Outputs US mpg, L/100 km, and km/L. This is not a trip cost page.
- Pace Calculator Running or walking pace per km and per mile, plus speed, from distance and time.
- Speed Distance Time Enter exactly two of distance, speed, and time. The third is solved. Pace is listed as well.
- Bill Split Calculator Split a bill, optional tax, and tip across N people in this browser.
- Tip Calculator Tip is bill times percent. Total is bill plus tip. Per person divides the total. Not a local tax table.
- Volumetric Weight Calculator Volumetric weight is box volume in cm³ divided by a divisor you pick. Common air divisors are 5000 or 6000. Optional actual kilograms yield a chargeable mass as the larger of actual and volumetric. Not a carrier quote.
- Wind Chill Calculator National Weather Service 2001 wind chill. Type air temperature in Fahrenheit and wind speed in miles per hour. The formula still prints outside T ≤ 50 °F and wind ≥ 3 mph, with a range note. Not a forecast.