I used to mash the fixed charge into the unit rate like some jugaad. Take last bill, divide total rupees by units, call that the rate. Then I add fixed charge again in my head and double-count. Or I forget and the estimate is short. Messy rate, messy mood.
Fixed charge is the extra box. Dont stuff it into the unit rate unless you want a messy rate.
The electricity bill calculator has Units this month, a rate style, rate boxes, and Fixed charge at the bottom. That last one is where the standing charge, meter rent flavour, or whatever your sheet calls the flat bit, goes.
I dont fake every DISCOM tariff. You type the rate from your last bill. You type the fixed rupees from the same bill. Official board site still wins.
Find the fixed line on a real bill
Open last month PDF. Not the WhatsApp image that is cropped.
Look for words like fixed charge, demand charge, meter rent, standing charge, customer charge. Different boards use different English. The idea is the same. A amount that does not care if you used 80 units or 280, or cares only in a slab of sanctioned load, not per unit.
Write that rupee number. If it is ₹80, type 80. If it is ₹150, type 150.
Energy charge is the other pile. Units times a rate, or units through slabs. That pile goes in the rate boxes, not in fixed.
Taxes and duty might sit as a percent on energy, or as extra lines. I do not have a GST-of-electricity dropdown. If your bill has a duty of ₹120, you can add 120 into fixed as a lump for a rough total. That is a jugaad. I say it is a jugaad so you dont think I modelled the whole tariff book.
Fuel surcharge sometimes is per unit. Then it belongs in the rate, not in fixed. If last bill says energy 6.50 and FPPCA 0.80, I type 7.3 as a single rate. Or I keep 6.50 and accept I am low. I pick one method and stick.
I tried this on my last Jaipur-style bill. Fixed was a clear line. Energy was another. I typed both. Total sat near the payable before some small subsidy line I did not model.
If you have a subsidy, this tool will look high unless you reduce the rate yourself. I dont apply state subsidy codes.
Two meters, two bills. Run twice. Add. Dont average the fixed charges into one mystical rate.
Why stuffing fixed into the unit rate goes ugly
Say 320 units, energy rate ₹7, fixed ₹80. Energy 2,240. Plus 80 is 2,320.
If I do 2320/320 I get 7.25 as a "all-in" rate. Fine for that one month, if units stay 320.
Next month I use 180 units. If I still use 7.25, I assume fixed behaved like energy. It did not. Real bill is 1807 + 80 = 1,340. All-in method gives 1807.25 = 1,305. I am short 35. Small. At 80 units the miss is louder relative to the bill. At 500 units the all-in 7.25 overcharges the energy part versus a true 7 plus 80.
The miss changes with units. That is why I hate the mashed rate for planning summer vs winter.
If you only ever want one month copy-paste, mashed rate can land close. If you want to try "what if I cut 50 units", keep fixed separate. Change units. Leave fixed. That is the point of the extra box.
I still see people type rate 7.25 and fixed 80. Then they added fixed twice. Total jumps. They say the tool is high. They stuffed and also used the box.
Pick one. Either all-in rate and fixed 0, for a lazy single month. Or clean rate and real fixed. I prefer the second. Every time.
Default on this page is 320 units, 7 rupees, 80 fixed. Change them. Those defaults are a teaching example, not your city.
Single rate vs two slabs, fixed still sits outside
Rate style can be single or two slabs.
Single. One rate for all units. Plus fixed.
Two slabs. First slab units at rate 1. Rest at rate 2. Plus fixed.
Fixed does not become a third slab. It is a add-on after energy.
I dont ship a official 8-slab JVVNL or BESCOM table. Boards change slabs. I would go stale and then you would trust a wrong chart. You type two slabs if your sheet looks like that. If you have more than two, this page is a simplification. Group them, or run energy in a notebook and only use this for a check.
Example from the tool card. 320 units at ₹7 plus ₹80 fixed is ₹2,240 energy plus 80. Two-slab mode, first 150 at 5, rest at 8, same 320 units. Energy becomes 1505 + 1708 = 750 + 1,360 = 2,110, plus 80 if you keep fixed.
Your last bill rates will differ. Type yours.
Sanctioned load can change the official fixed charge. A 2 kW house and a 5 kW house may not share the same fixed line. I still dont have a load box. Copy the fixed from a bill that matches your current load. If you just got a load change, last old bill is the wrong fixed.
I am not your DISCOM. Estimate.
What I put in fixed, and what I refuse to dump there
I put the printed fixed charge.
I sometimes put meter rent if it is a flat rupee and not in the fixed line already. Dont double.
I sometimes lump a flat duty if I want one total and I am lazy. I note it in my head.
I do not put units in the fixed box. Units box exists.
I do not put the whole payable in the fixed box. That is not how this works.
I do not put last month arrears in the rate. Arrears are old story. If you want "what I will pay this due date", add arrears after the result. If you want "this month consumption cost", leave arrears out.
I do not put solar export in this version. Net metering is a different movie.
Minimum charges, if your board has a "you will pay at least this even if units are tiny", can act like a floor. This tool will not apply a floor. If your units are 12 in a locked flat, official bill may still look chunky. Type a higher fixed as a rough floor if you know that number. Again, jugaad.
I wrote 320 units electricity bill, rough amount with the same default shape. I dont know my unit rate, how to estimate the bill is for when the rate itself is the puzzle. This post is only "where does the flat rupee go".
For summer AC talk, summer bill around 400 units in Rajasthan still needs your rate and your fixed, not my imagination of a official tariff.
A walk I do when a cousin forwards a bill
I ask for the full PDF.
I circle units. Type units.
I circle energy rate or the two slab rates. Type those. Mode single or slabs.
I circle fixed. Type fixed.
I calculate.
I compare with current month charges, not with amount payable if payable has arrears and late fee.
If I am off by ₹20 to ₹80, I look at duty and tax lines. I lump or I ignore. I dont rewrite the tool.
If I am off by ₹800, I used the wrong units, or I used neighbour's rate from another state, or I forgot a second slab.
Neighbour rate is a classic. They live in a different board. They send "we pay 6 rupees". You type 6 and fixed 0. Your bill is 8.2 plus 140. Of course it "doesnt match".
Late fee is not energy. Add after.
If they took a reading estimate, units itself is a fiction. Tool cannot save a estimated reading. Wait for actual.
I keep last three bills. Fixed often stays same. Rate can move a bit with surcharge. I update rate when the surcharge line moves. I dont touch fixed every month if the line did not change.
When I plan to add a AC, I raise units, keep fixed, see the jump. That is the useful part. Mashed all-in rate hides how much of the bill is the standing cost you already pay for existing.
A small flat with low units feels "expensive per unit" because fixed is a bigger slice. That is not a bug. That is the extra box doing its job.
Short answers I repeat on the phone
Where to add fixed charge. The Fixed charge box. Rupees, not rupees per unit.
Should I divide fixed by units and add to rate. Please dont, if you will change units later.
What if my bill has no fixed line. Type 0.
What if fixed is 0 on a temporary connection story. Type 0, but read that bill twice. Temporary can have other lumps.
Is this my city tariff. Only if you typed that tariff.
Can I skip fixed to see only energy. Yes. Type 0. Good for "how much did the AC add" if you already paid the standing cost anyway.
I still type fixed when I want the number that looks like the PDF.
This is a estimate. Your DISCOM bill is the legal one. I will not upload a official schedule and pretend it is live.
Leave the unit rate clean. Leave fixed in its box. That is the whole habit. I wish I had started with that instead of the jugaad division.