How high is the first base camp on mount Everest?

North (Tibet) side camps: Base Camp: 17,000ft --- ABC: 21,300ft --- Camp 1: 23,000ft --- Camp 2: 24,750ft --- Camp 3: 25,600ft --- Camp 4: 27,400ft

South (Nepal) side camps: Base Camp: 17,400ft --- Camp 1: 19,600ft --- Camp 2: 20,700ft --- Camp 3: 23,000ft --- Camp 4: 26,100ft