21Relay
Bitcoin Utilities

21Relay utility

UTXO Consolidation Calculator

Compare the estimated cost of consolidating multiple UTXOs now with spending them together during a future fee market.

Detail level

Guided mode keeps the decision focused. Advanced mode reveals extra assumptions.

Privacy notice: The calculator runs locally. It cannot see wallet labels or the privacy history of UTXOs you may combine.

Keep in mind: Virtual sizes use reviewed planning estimates for common single-signature input and output types; your signed transaction can differ.

Consolidation assumptions

Quick starts

Now versus later

Lower fees, with a privacy trade-off

Consolidating now could reduce the modelled total by 16,984 sats. Review wallet labels before combining anything.

Estimated difference

Save 16,984 sats

Cost to consolidate now

1,716 sats

Spend separately later

22,225 sats

Consolidate now + spend later

5,241 sats

Consolidation size

~858 vB

Break-even future rate

1.15 sat/vB

Spend separately later22,225 sats
Consolidate then spend5,241 sats
Privacy check: spending these UTXOs together reveals that one entity may control them. Consider labels and origin—not only fees.
Methodology, data and limits
  • Virtual sizes use reviewed planning estimates for common single-signature input and output types; your signed transaction can differ.
  • Consolidation links previously separate outputs on-chain and can reduce privacy. Do not consolidate solely to chase a small fee saving.
  • A wallet must preserve enough value for the selected fee and should create a fresh receiving address for consolidation.

Related utilities

Transaction Size Calculator

Estimate virtual size from input type, input count, outputs and multisig configuration.

Open tool

Fee Estimator

Estimate on-chain transaction fees from current fee-rate recommendations.

Open tool

UTXO Health Check

Review manually entered UTXO values for high-fee exposure and privacy trade-offs.

Open tool

Connected workflow

Review wallet and UTXO health

1. UTXO Health Check
2. UTXO Consolidation Calculator
3. Transaction Size Calculator

Was this tool useful?

Choose “Not yet” to tell us what needs work.

21Relay utilities are educational planning tools, not financial, tax or investment advice. Verify important decisions independently.

Report a tool issue