Send Bitcoin at the wrong moment and you can pay ten times more than the person who waited an hour. This free Bitcoin fee estimator reads the live mempool — the waiting room of unconfirmed transactions — and shows what a send costs right now at four speeds, from next-block priority down to economy. Tell it your transaction size and it prices each speed in satoshis and dollars. Underneath sits the Crypto Fear & Greed Index, the market’s daily mood reading from 0 (extreme fear) to 100 (extreme greed), with the last seven days for context. Both feeds are live, free and need no account.
How to use this fee estimator
Pick the transaction size that matches your send — a simple one-input payment is about 140 virtual bytes; consolidating two inputs is nearer 226; batch and wallet-sweep transactions run larger — or type the exact vByte size your wallet shows you. The table then prices each confirmation speed: the fee rate in satoshis per vByte that miners are currently accepting at that priority, and what it means in total sats and dollars for your transaction. Fees change block by block, roughly every ten minutes, so press Refresh right before you send rather than trusting a reading from this morning.
Fast, slow, or stuck: what the speeds mean
Miners fill each block with the highest-paying transactions first. Pay the “next block” rate when the payment is urgent and the mempool is busy; in quiet periods that same rate is money wasted, because even the economy fee confirms in the next block or two. The honest trap is the middle: a fee set slightly too low does not confirm slowly — it can sit unconfirmed for days until the mempool clears or the transaction is dropped. Most wallets hide all this behind “fast/medium/slow” buttons; this tool exists so you can see the actual numbers those buttons are choosing between, and catch the days when “slow” costs a tenth of “fast” for the same result.
The Fear & Greed Index, without the hype
The index blends volatility, market momentum, social-media sentiment, surveys and Bitcoin’s share of the total crypto market into one daily number. Extreme fear (under 25) has historically appeared near market bottoms, extreme greed (over 75) near frothy tops — which is why the old advice says to be fearful when others are greedy and greedy when others are fearful. Treat it as a thermometer, not a trading signal: it measures mood, and mood can stay extreme for weeks. It is included here because the same people checking fees before a transfer are usually deciding whether to move at all, and one honest number beats a feed of shouting.
About the data
Fee recommendations come from mempool.space, the open-source explorer whose estimates most wallets quietly rely on; the BTC price used for dollar figures comes from the same source, and the index from Alternative.me, which has published it daily since 2018. Nothing here is financial advice, and no fee can be guaranteed — a sudden flood of transactions can outbid any estimate within one block. When a send truly cannot wait, the next-block rate is the practical answer; when it can, the economy column is where the savings live.
Weekends are cheaper: the mempool has a rhythm
Fees follow human working hours more than most people expect. Business days bring exchanges batching withdrawals, payment processors settling and thousands of wallets competing for the same block space; weekend mempools regularly thin out to the minimum relay fee, sometimes for hours at a time. If a transfer is not urgent, the single easiest saving in Bitcoin is patience: set the transaction aside, watch this estimator on a Saturday, and send when the economy column sits at 1–2 sat/vB. The same rhythm runs in reverse around major price moves, when panic and euphoria both pay premium rates — precisely the days the Fear & Greed reading below tends to hit its extremes.
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