From that point follow the diagonal line up or down to the desired temperature and then read the new time from the bottom row. Locate the point on the grid where the recommended time and temp intersect. Time/Temp Conversion Chart Conversion chart instructions Many thanks to Matthew for providing the code and contributing to this resource! This calculator was created by Matthew Roughan. Warnings will be displayed if the difference between the original and actual temperature is large, or the final developing time is short. Films and developers vary widely so you should always test any time/temp combination prior to using it on important work. PLEASE NOTE: These conversions are approximate and are based on standard black and white film in normal developer. This is particularly useful if you want to convert standard times for use with a motorised processor (eg. You can also use this calculator to determine the time change if you prefer to use continuous agitation where a time normally relies on intermittent agitation. Be sure that the units (Celsius or Fahrenheit) are set correctly, then press the Submit button and the modified time will be displayed. Always enter the temperature in decimal format. To use it, enter the recommended developing time and temp from the Massive Dev Chart into the relevant fields, along with the actual temperature you want to use. To go from Fahrenheit to Celsius, take 30 off the Fahrenheit value, and then half that number.įor a 100% accurate answer, subtract 32 and divide by 1.This calculator takes a standard developing time and adjusts it for temperature. It's not a difficult extra step, but it seems to be something that can cause confusion. If we pegged absolute zero to be 0☏, 0☌ and 0K, converting between them would be much easier, but Fahrenheit and Celsius were defined before we could tell where absolute zero was, and as a result Fahrenheit, Celsius and Kelvin all start from different values.īecause these temperature units don’t share a common zero point, we need to add or subtract an offset before we do our division or multiplication. Temperature units aren't built in the same simple way, because they don't all start in the same place at zero. Because they both start at zero, the formula to convert between the two very easy (in = cm * 0.39370) So we can say that adding 1 inch is the same as adding 2.54 centimetres. The relationship between an inch and a centimetre is that 1 inch is 2.54 centimetres. The only difference between adding one inch or one centimetre is the amount of distance we're adding. Similarly, to go from zero centimeters to 1 centimeter, we need only add 1 centimeter. Taking inches and centimeters as an example, to go from zero inches to 1 inch we need to add one inch. Zero centimeters = zero meters = zero inches. We all know exactly how long zero centimeters or inches is, and can convert zero of any of those units into another type of unit very easily. have one thing in common – their values all start from zero. Most things we measure – length, width, time etc. Fahrenheit to Celsius formulaġ.8000 Why is converting Fahrenheit to Celsius so complicated? One degree Celsius is equal to one Kelvin, so we can say that the boiling point of water is equal to 273.15 + 100 = 373.15 Kelvin. The scientific definition of Celsius is now defined against degrees Kelvin. At the other end of the scale, 100 degrees Celsius is the boiling point of water. The Celsius scale is nowadays set in such a way that Zero degrees C is the temperature at which ice melts (note : not the temperature at which it freezes, which is different!). Normal body temperature is considered to be 98.6 ☏ (in real-life it fluctuates around this value). Boiling and freezing point are therefore 180 degrees apart. In the Fahrenheit scale, water freezes at 32 degrees, and boils at 212 degrees. Note that this value isn’t perfect, but it might save you having to reach for a calculator (or our site!) Absolute Zero Simply take 30 off the Fahrenheit value, and then half that number. There's a simple rule to convert Fahrenheit to Celsius that should be good enough for general use. Quick and easy Fahrenheit to Celsius conversion
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